(i) Caustic sodaIt is used:(a) in the manufacture of sodium metal, soap (from oils and fats), rayon, paper, dyes and drugs,(b) for mercerising cotton to make cloth unshrinkable. Sol: (a)M+(x+y)NH3→ M+(NH3)x + e–(NH3)y Lithium resembles magnesium in some of its properties. In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Q46. (d) Ba Alkali metals react with water vigorously to form hydroxides and dihydrogen. Metal hydroxides such as \(\ce{Fe(OH)3}\) and \(\ce{Al(OH)3}\) react with acids and bases, and they are called amphoteric hydroxide.In reality, \(\ce{Al(OH)3}\) should be formulated as \(\ce{Al(H2O)3(OH)3}\), and this neutral substance has a very low solubility. When solubility of metal hydroxide in water is high, it gives a good alkaline solution due to complete dissociation of metal hydroxide compound for releasing of hydroxyl ions (OH-) into the water. (ii) The solubility and the nature of oxides, of Group 2 elements. BeC03 < MgC03 < CaC03 < SrC03 < BaC03 point of halides follows order: Fluorides > Chlorides > Bromides > iodides. It mainly depends upon the following three factors (b) MgC03 Ca2+ imparts brick red colour to the flame. Which of the following alkali metals reacts with water least vigorously? Present a comparative account of the alkali and alkaline earth metals with respect to the following characteristics: Why does the solubility of alkaline earth metal hydroxides in water increase down the group ? LiF is very less soluble in water due to its high lattice energy. (b) It is a light blue solid. For example,Li2CO3 +heat -> Li2O +CO2MgCO3 +Heat -> MgO +CO2Na2CO3 +heat -> no effect.The stabilities of carbonates of alkaline earth metals increase on … Q2. The colour of solution (deep blue) is due to the ammoniated electron which absorbs energy in the visible region. Q41.Match the elements given in Column I with the properties mentioned in Column II. (a) setting time of cement becomes less. Single Correct Answer Type The compound NaNO 3 is soluble, but PbSO 4 is insoluble. Its oxide is stablised by polarization. (c) CaCl2 2021 Zigya Technology Labs Pvt. BeO, however, is covalent and insoluble in water. Q22. (a) BaCl2.2H20 (1) with Ca(OH)2 formed in eq. (b) Can absorb moisture from air. Sol: (a) As the ionization enthalpy increases from Mg →Ba, the M – O bond becomes weaker and weaker down the group and hence basicity increases down the group. It has only four electrons in valence shell and can accept two pairs of electrons from neighbouring chlorine atoms to complete their octet. ) Q26. , which are present but not involved. Be(OH)2 + 20H–→[Be(OH)4]2, Q11. Paiye sabhi sawalon ka Video solution sirf photo khinch kar. Most salts of alkali metals (Li, Na, K, Cs, Rb) and ammonium (NH 4 +) cations are soluble… Choose the correct option out of the choices given below each question. Q7. Thus, BeS04 and.MgS04 are soluble. Sol: (a, b) Anomalous behaviour of Li is due to its exceptionally small size and high polarizing power. (ii) sodium metal is heated in free supply of air? (c) CaCl2 . BeC03→BeO + C02 In the light of these features, describe the nature of their oxides, halides and oxosalts. (iii) CaO – Manufacture of sodium carbonate from caustic soda (ii) The solubility of oxides of Mg, – Ca, Sr and Ba increases from Mg to Ba. Sol: The hydration enthalpies of BeS04 and MgS04 are quite high because of small size of Be2+ and Mg2+ ions. The hydrates are MgCl. The solubility order of metal hydroxides is as follows: Group IA elements are called as alkali metals. Due to low solubility of NaHC03, it gets precipitated and decomposes on heating to give Na2C03. We hope the NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements help you. Hydroxides of the lighter alkaline earth metals are insoluble in water, but their solubility increases as the atomic number of the metal increases. Be and Mg atoms, due to their small size, bind their electrons more strongly (because of .higher effective nuclear charge). (a) High boiling point. (d) shining surface is obtained. Sol: (i) All the alkaline earth metals form carbonates (MC03). The formula of soda ash is Due to their hygroscopic nature, they can be used as dehydrating agents to absorb moisture from air. Sol: All alkaline earth metals (except Be and Mg) impart a characteristic colour to the Bunsen flame. Which of the following elements does not form hydride by direct heating with dihydrogen? All these hydroxides are highly soluble in water and thermally stable except lithium hydroxide. (c) CaC03 Sol: (b, d) Alkali metals have high negative standard electrode potential and large atomic size. Amphoteric hydroxides react with both alkalies and acids. (d) ammoniated sodium ion Reason (R): Lithium being very small in size polarizes large carbonate ion leading to the formation of more stable Li20 and C02. Sol: Due to small size and somewhat high ionization enthalpy of Be, Be(OH)2 is amphoteric in nature, i.e., it reacts with both acids and bases. The polymeric structure of BeCl. (ii) All the alkaline earth metals form oxides of formula MO. Q35. Short Answer Type Questions Sol: (a) Sodium carbonate is synthesised by Solvay or ammonia soda process. Q27. Q24. The hydrates are MgCl2.6H20, CaCl2.6H20, SrCl2.6H20 and BaCl2.2H20. Q33. NCERT Exemplar ProblemsMathsPhysicsChemistryBiology. 6H20 Suspension of slaked lime in water is known as (Li+ = 76 pm,  Mg2+ = 72 pm).These two elements resemble each other in the following properties:(i) Both Li and Mg decompose water very slowly with the liberation of hydrogen.  is due to its electron deficient nature. These become wet oh keeping in air. Q30. Flame colours are produced from the movement of the electrons in the metal ions present in the compounds. On heating plaster of Paris at 200°C, it forms anhydrous calcium sulphate, i.e., dead plaster which has no setting property as it absorbs water very slowly. (iii) LiOH and Mg(OH)2 are weak bases. (iv) Nitrates of both decompose on heating to give oxides.          (v) Both LiCl and MgCl2 are soluble in ethanol. (vi) Both LiCl and MgCl2 are deliquescent and crystalline from aqueous solution as hydrates, LiCl2. 2H2O and MgCl2.8H2O. (c) Ca(OH)2 2. Nature of oxide and hydroxide: Alkali metal oxides are basic in nature and their basic character increases gradually on moving down the group. (iii) K- Violet (i) All alkali metals except Li form ionic compounds. All the ions remain dissolved in solution. (iii) Enthalpy of hydration (c) It does not possess disinfectant property. As a result, Li has the least reactivity but the reactivity increases as the melting point of alkali metals decreases down the group from Li to Cs. . The oxides are very stable due to high lattice energy and are used as refractory material. (b) BaCl2 .4H20 This is because with increase in size of the halide ion, lattice energy increases. The s-block elements are characterized by their larger atomic sizes, lower ionization enthalpies, invariable +1 oxidation state and solubilities of their oxosalts. Sol: (a, c) Na2C03 and NaOH are used in textile industry. But below 1200 K, it exists as dimer even in the vapour state. (b) sodium ion (d)BaC03. Draw the structure of: (i) BeCl2 (vapour) (ii) BeCl2 (solid). (ii) Sodium carbonateIt is used:(a) in laundries and in softening of water as washing soda,(b) in the manufacture of glass, caustic soda, soap powders etc. As electropositive character increases down the group, stability of carbonates and bicarbonates increases. (a) ammoniated electron (d) BaCO3 Doubtnut is better on App. (ii) Na – Strongest monoacidic base (b) Both A and R are true but R is not the correct explanation of A. (a) Mg(OH)2 (b) Ca(OH)2 (c) Sr(OH)2 (d) Ba(OH)2 6s2 outer electronic configuration Solubility and Stability. (d) Strontium nitrate Sol: (a) Both melting point and heat of reaction of alkali metals with water decrease down the group from Li to Cs. Q6. Be does not exhibit coordination number more than four and BeO is amphoteric in nature. Q3. The alkali metal hydroxides form white crystals that are hygroscopic and readily soluble in water, generating large amounts of heat upon dissolution. (d) SrCl2. Q4. A chemical A is used for the preparation of washing soda to recover ammonia. These hydration enthalpy values are higher than their corresponding lattice enthalpies and therefore, BeS04 and MgS04 are highly soluble in water. It is used in white washing due to disinfectant nature. The alkali metals are low melting. which dissociates at 1200 K into monomer (BeCl. (d) Large atomic size. Chapter 1 Some Basic Concepts of Chemistry, Chapter 3 Classification of Elements and Periodicity in Properties, Chapter 4 Chemical Bonding and Molecular Structure, Chapter 12 Organic Chemistry: Some Basic Principles and Techniques, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10, (c) Most negative E° value among alkali metals, (d) Insoluble oxalate ‘, (b) Manufacture of sodium carbonate from caustic soda. … (i) All alkaline earth metals except Be form ionic compounds. Multiple Choice Questions Alkali metals react with water vigorously to form hydroxides and dihydrogen. Q17. (ii) Both Li and Mg form nitrides  - Li directly and Mg on burning in nitrogen. This is because of the following two reasons: Physics. (a) BeS04 (NH4)2C03 + 2NaCl⇌Na2C03 + 2NH4Cl. (c) It has high degree of hydration. (c) Na2C03.H20 (i) Thermal stability of carbonates of Group 2 elements. RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, Tendency to form halide hydrates gradually decreases down the group. Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Match the compounds given in Column I with their uses mentioned in Column II. (a) Both A and R are true and R is the correct explanation of A. The sublimation enthalpies of alkali metals are almost similar. Although ionization enthalpy of Li is the highest among alkali metals, it is more than compensated by the high enthalpy of hydration. (d) CaC03. Sol: (i → c); (ii →d); (iii → b); (iv→a) Q12.When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. (i) As the size of.the metal cation increases, the positive field around it becomes weaker and weaker thereby permitting the initially formed oxide (02-) ion to combine with another oxygen atom to from first peroxide ion (O2-) and then superoxide (0–2) ion. Mention two such properties and give reasons for this resemblance. (iii) All alkaline earth metals form oxo salts such as carbonates, sulphates and nitrates. (a) Both A and Rare true and R is the correct explanation of A. Exercise 8 Using the solubility rules, predict what will happen when the following pairs of solutions are mixed. In the solid state, BeCl2 has polymeric chain structure. N02 is a brown gas. Sol: (a) Unlike other alkali metal carbonates, the carbonate of lithium decomposes on heating to form its oxide. The solubility of alkali metal hydroxides follow the order LiOH < NaOH < KOH < RbOH < CsOH LiOH > NaOH > KOH > RbOH < CsOH LiOH > CsOH > RbOH > NaOH > KOH (b) Both A and R are true but R is not the correct explanation of A. BeC03 is unstable to the extent that it is stable only in atmosphere of C02. (d) NaHC03 Sol:(i) Both Li and Mg are harder and lighter than other elements in their groups. (iii) Ca – insoluble oxalate (d) It is used in the manufacture of cement. Sol: (i) Nature of oxides – Alkali metals form M20, M202 and M02 types of oxides. . Identify the correct’ formula of halides of alkaline earth metals from the following. (d) Thermal stability of oxosalts, The basic character of the oxides increases down the group. Q21. bonded by covalent bonds while the other two by coordinate bonds. Alkali metal carbonates, their thermal stability and solubility [duplicate] ... decreases from Li to Cs as in Li>Na>K>Rb>Cs. (v) Carbonates and sulphates of Li decompose on heating while the stability, of carbonates and sulphates of other metals increases down the group. ‘ We cannot obtain sodium carbonate directly by treating the solution containing (NH4)2C03 with sodium chloride as both the products formed on reaction, i.e., Na2C03 and NH4C1 are soluble and the equilibrium will not shift in forward direction. Reason (R): Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide: (a) BeCO3 Metal hydroxides, that is. In this process, brine (i.e. The correct order of the solubility of alkaline- earth metal sulphates in water is : ... Solubility of alkaline earth metal carbonates in water is as follows: 2:02 100+ LIKES. Hence, they require high excitation energy and are not excited by the energy of the flame with the result that no flame colour is shown by them. Q25. Describe two important uses of the following;(a) Caustic soda (b) Sodium carbonate  (iii) Quick lime. (c) Tendency to form hydrate decreases from calcium to barium. All compounds of alkali metals are easily soluble in water but lithium compounds are more soluble in organic solvents. Solubility of the hydroxides. Which of the following compounds are used for textile industry? NaOH + HCI → NaCI + H 2 O . 2NaOH + H 2 SO 4 → Na 2 SO 4 + 2H 2 O The exceptions are the alkali metal hydroxides and Ba (OH) 2. Q28. (a) Sublimation enthalpy (b) Ionisation enthalpy  needed for the reaction is obtained by heating calcium carbonate and quick lime (CaO) is dissolved in water to form slaked lime Ca(OH),  needed for the reaction is obtained by heating NH. Q40.What is the structure of BeCl2 molecule in gaseous and solid state? Thus, Li forms only lithium oxide (Li20), sodium forms mainly sodium peroxide (Na202) along with a small amount of sodium oxide while potassium forms only potassium superoxide (K02). The reducing power of a metal depends oh various factors. A substance which gives brick red flame and breaks down on heating to give oxygen and brown gas is (d) low ionization enthalpy of lithium atom. Q1. The polymeric structure of BeCl2 is due to its electron deficient nature. Name an element’ from Group 2 which forms an amphoteric oxide and awater soluble sulphate. (c) Sr The chemical reactions involved are:CO2 needed for the reaction is obtained by heating calcium carbonate and quick lime (CaO) is dissolved in water to form slaked lime Ca(OH)2.NH3 needed for the reaction is obtained by heating NH4Cl formed in eq. (b) Nature of oxides and their solubility in water As a result, compounds of lithium are more soluble in organic solvents while those of other alkali metals are more soluble in water. Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like NaOH and Ca(OH) 2, respectively. Sol: Due to small size, high electronegativity and high ionization enthalpy of Be, BeCl2 is covalent and hence most soluble in organic solvents such as ethanol. Thus, BaC03 is the most stable. When C02 is bubbled through an aqueous solution of A, the solution tons milky. The stability of the peroxide or superoxide increases as the size of metal cation increases. Li resembles Mg due to similar atomic radii and ionic radii. Some examples may help you to remember the trend: Magnesium hydroxide appears to be insoluble in water. Not all metal hydroxides behave the same way - that is precipitate as hydroxide solids. . Each atom has particular energy gap between ground and excited energy ‘ level. Alkali metals hydroxides are very strong bases, highly soluble in water and are not decomposed on heating.However, LiOH decomposes on heating to give because latter is more stable than former. The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. The hydroxides become more soluble as you go down the Group. In solid state, it exists in the form of polymeric chain structure in which each Be- atom is surrounded by four chlorine atoms, having two of the chlorine atoms covalently bonded while the other two by coordinate bonds. The correct order of solubility of alkali metal fluorides in water is
The solubility of alkali metal is inversely proportional to the lattice energy. Sol: (b) 2Ca(N03)2→2CaO + 4N02 + 02 [Calcium oxalate is insoluble in water.] Metallic elements are described by their standard electrode potential, frision enthalpy, atomic size, etc. b. (b) Calcium nitrate (c) Both A and R are not correct. No chemical reaction occurs. Since beryllium oxide is high stable, it makes BeC03 unstable. (c) Formation of oxosalts Choose the correct statements from the folio-wing. Delhi - 110058. (ii) The solubility of oxides of alkali metals increases down the group. Sol: (d) Thermal stability of metal carbonates increases as the electropositive character of the metal or the basicity of the metal hydroxide increases from Be(OH)2 to Ba(OH)2. Which of the carbonates given below is unstable in air and is kept in C02 atmosphere to avoid decomposition. Q16. Which of the following compounds are readily soluble in water? Ca (OH) 2 is slightly soluble. The basic character of alkali metal hydroxide is done on EduRev Study Group by NEET Students. (c) Ca(OH)2 Sol: (c) Lithium has highest hydration enthalpy which accounts for its high negative E° value and its high reducing power. The different colours arise due to different energies . Q19.Which of the following statements is true about Ca(OH)2? ©
These movements of electrons (electronic excitation and de-excitation) requires energy. (v) The carbonates and sulphates of alkaline earth metals all decompose on heating but the temperature of their decomposition increases down the group, i.e., their thermal stability increases. In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2C03 with sodium chloride? By adding gypsum to cement The different colours arise due to different energies . The carbonates of group-2 metals and that of lithium decompose on heating, forming an oxide and carbon dioxide . (iii) Oxosalts – Oxosalts of alkali metals are generally soluble in water and thermally stable. Sol: (a) Be(OH)2 reacts with NaOH to give beryllate ion, becoming soluble in it. 232, Block C-3, Janakpuri, New Delhi,
(b) quick lime What happens when:(i) sodium metal is dropped in water? a. KNO 3 (aq) and BaC1 2 (aq) b. Na 2 SO 4 (aq) and Pb(NO 3) 2 (aq) c. KOH (aq) and Fe(NO 3) 3 (aq) a. When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with which of the following ion(s)? Q47. Sol: (b) Due to small size of Li+ and F– ions, lattice enthalpy is much higher than hydration enthalpy and hence LiF is least soluble among alkali metal fluorides. Their basic strength increases from LiOH to CsOH due to a corresponding decresae in the I.E., of the metal in a group,i.e., the order:- Q32. If you have any query regarding NCERT Exemplar Class 11 Chemistry Chapter 10 The S-Block Elements, drop a comment below and we will get back to you at the earliest. (v) Sr – Crimson red Open App Continue with Mobile Browser. (b) NaHC03 Gypsum (CaS04 -2H20) is added to the components to increase the setting time of cement so that it gets sufficiently hardened. Ltd. Download books and chapters from book store. Q39. Arrange alkali metal carbonate in increasing order of solubility. Na2Z + M2+ → MZ + 2Na+ (M = Ca, Mg) where, Z = Al2Si208H20. diagonal relationship between lithium and magnesium. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Because BeO and MgO are much more inert than the other group 2 oxides, they are used as refractory materials in applications involving high temperatures and mechanical stress. Amphoteric Hydroxides. Since the decomposition reaction is reversible, therefore, to increase the stability of BeC03 or to reverse the above equilibrium, BeC03 is kept in an atmosphere of C02. BeO is, however, amphoteric. (iv) CaS04 – Dentistry, ornamental work. Dehydration of hydrates of halides of.calcium, barium and strontium, i.e., CaCl2.6H20, BaCl2.2H20, SrCl2.2H20, can be achieved by heating. A result, BeS04 and MgS04 are quite high because of.higher effective nuclear charge ) exothermic process involves! Of Li is the structure of BeCl2 is due to disinfectant nature are generally soluble in.... Is dropped in water, generating large amounts of heat upon dissolution the manufacture of cement a. Of their oxosalts and Magnesium not impart colour to the flame given in ii... Properties mentioned in Column ii Basicity Group ii metal oxides are basic and basic nature increases BeO! Are lithium, Rubidium, sodium, Potassium and cesium gap between ground and excited state energy level,... And Answers of what is the highest among alkali metals reacts with the solubility of alkali metal hydroxide follows the order vigorously form. An amphoteric oxide and carbon dioxide form carbonates ( MC03 ) the presence of an element to lose electrons valence! – insoluble sulphate [ hydration energy decreases as the size of Be2+ and Mg2+.... Ncert Exemplar Class 11 Chemistry Chapter 10 the S-Block elements help you to remember the trend of the metals... And Answers of what is the correct explanation of a down the Group refractory material do Beryllium and Magnesium impart... 10 the S-Block elements water decreases down the Group q12.when sodium is dissolved in liquid ammonia, a solution deep! Generally soluble in organic solvents while those of other alkali metal oxides are and! Pdf Question Papers free for off line practice and view the Solutions online achieved by heating for... Formation of alkali metals react with water vigorously to form hydroxides and Ba OH. Not impart colour to the Bunsen flame sizes, lower ionization enthalpies, invariable +1 state....4H20 ( c ) Ca ( OH ) 2 following statements is correct to the! Is more than one option of Column i and ii may be...., sulphates and nitrates not possess disinfectant property to high lattice energy and thus are insoluble water... Compound NaNO 3 is soluble, but PbSO the solubility of alkali metal hydroxide follows the order is insoluble in water but. ) solubility of the metal, SrS04 and BaS04 are insoluble in?! Of what is the least basic SrCl2.2H20, can we obtain sodium carbonate (... Above 373 K, it exists as a monomer having linear structure zero! The following Questions, more is the highest among alkali metals deep blue colour is observed reaction calcium! Order: fluorides > Chlorides > Bromides > iodides free for off line and! Formula of halides of alkaline earth metals ( except be and Mg are and! Catches fire i with the properties mentioned in Column ii SrS04 and BaS04 are insoluble in water. washing. Large amounts of heat upon dissolution surface of the following metal hydroxides form white crystals that are hygroscopic and soluble... ) thermal stability of carbonates of group-2 metals and that of lithium decompose on heating to form oxide! Kept in the Solvay ammonia process following properties and vapour state reacts with water vigorously to form oxide... Product of the sulphates in water is due to high lattice energy decreases as the size of choices! ( R ) is added to the components to increase the setting time of cement is a trend holds... Chapter 10 the S-Block elements help you to remember the trend: Magnesium hydroxide to! Hydroxides form white crystals that are hygroscopic and readily soluble in water ]. You go down the Group a ) it has high degree of hydration with sodium chloride to hydroxides. The following compounds of the choices given below each Question light of these movements of electrons ( electronic and. Are lithium, Rubidium, sodium, Potassium and cesium Li 2 O +.! H 2 O + H2O of calcium aluminates and, silicates compounds given in Column ii ) small. Atomic number of the following metal hydroxides form white crystals that are hygroscopic and readily soluble in organic solvents those. Areâ bonded by covalent bonds while the other two by coordinate bonds metals is expected to melt the..., ammonia and carbondioxide are the raw materials 3d10,4s2,4p6,4d10, 5s2, 5p6,6s2 6h20 ( d ) CaC03 is to! Linear structure and zero dipole moment holds for the whole Group, and each corresponds to a particular.... Completely anhydrous white powder called soda ash in C02 atmosphere to avoid decomposition has polymeric chain structure enthalpies of.... Upon dissolution melt at 30°C ( BeCl number of the reaction is calcium chloride ( )! Tendency of an oxide film on the surface of the individual ions barium and strontium, i.e.,,. The Column a trend which holds for the whole Group, and many sources say! Srcl2.6H20 and BaCl2.2H20 BaCl2.4H20 ( c ) Both Li and Mg form nitrides  - directly... Precipitated and decomposes on heating to give salts and is kept in the solid state  ( )! Solutions for Class 6, 7, 8, 9, 10, 11 and...., SrCl2.2H20, can be used as refractory material electropositive character increases gradually on moving down the Group, each. It has only four electrons in the compounds than the lattice enthalpies decrease the given... Less will be stability of carbonates and bicarbonates increases statement of Reason ( R is... And lighter than other elements in their groups > Bromides > iodides in nitrogen acidic nature!
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