Which one of the following has maximum lattice energy? 2)All lanthanides and actinides 3)Transition metals – Sc, Y , La, Ac, Tc, Zr, Hf, Pd Depending upon the physical and chemical properties, the hydrides have been divided into the followin… Binary metal hydrides of the alkali metal and alkali earth metal hydrides do not fulfill the hydrogen storage requirement at temperatures below 120 °C. Which among the following elements of group-2 exhibits anomalous properties ? Recent efforts to modify the kinetics and thermodynamics of H 2 release from AB have been made by replacing one H with an alkali metal , , i.e., LiNH 2 BH 3 and NaNH 2 BH 3, and alkaline-earth metal hydrides , , , , which show a significant enhance of dehydrogenation kinetics and a suppressed borazine release. Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. The thermal stability and chemical reactivity of nanoparticles of lithium hydride, sodium hydride and potassium hydride have been studied. For example the alkali metals on reaction with limited quantity of oxygen form normal oxides of formula, … And thermal stability decreases and heat of formation decreases down the group. Of the following, which species is primarily obtained in a solution containing $ KHF_2 $ ? Ltd. Take Zigya Full and Sectional Test Series. 3) Alkali metal hydrides (LiH, NaH, KH, RbH) have rock salt structure. Which one of the following statements is an incorrect? The facts. The atomic radiusis: Find out the solubility of $Ni(OH)_2$ in 0.1 M NaOH. Small anion forms stable compounds with small cation.The thermal stability of alkali metal hydrides decreases as:LiH> NaH > KH > RbH  >CsHbecause the size of cation increases as;Li+ < Na+ < K+ < Rb+ NaH > KH > RbH > CsH. The halide of which alkaline earth metal is covalent and soluble in organic solvents? Sulphates. Alkali metal hydrides also react with water to produce hydrogen gas and a hydroxide salt: They have the same crystal structure as sodium chloride, which is why they are called saline or salt-like hydrides. The hydride of beryllium can be prepared indirectly by reducing beryllium chloride with lithium aluminium hydride. Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. The general formula being MHxwhere M represents the element and x is the number of hydrogen atoms. What will be the $ H^+ $ ion concentration in the mixture? Metal hydrides could be considered ideal solid-state hydrogen storage systems, they have light weight and high hydrogen volumetric densities, but the hydrogen desorption process requires excessively high temperatures due to their high stability. (a) Nitrates (b) Carbonates (c) Sulphates Answer: (a) Nitrates of both group 1 and group 2 elements are soluble in water because hydration energy is more than the lattice energy. Check you scores at the end of the test. By using the reactive alkali metal hydride NaH precursor as a source of sodium, the reaction is completed within a span of 12 hours. The thermal stability of these hydrides decreases in which of the following order Given that the ionic product of $Ni(OH)_2$ is $2 \times 10^{-15}$. Classification of Elements and Periodicity in Properties. respectively. The alkali metals form salt-like hydride by the direct synthesis at elevated temperature. They are all very reactive and readily react with various compounds. On electrolysis of dil.sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be: An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. ; Ti = 22, V = 23, Fe =26, Co = 27), Greater is the number of unpaired electrons, larger is the paramagnetism. Hydrogen reacts with alkali metals to form hydride M+H-. NEET Chemistry Solved Question Paper 2008, Class 11 NCERT Political Science Solutions, Class 11 NCERT Business Studies Solutions, Class 12 NCERT Political Science Solutions, Class 12 NCERT Business Studies Solutions, https://www.zigya.com/share/Q0hFTk5UMTExMzQxNjM=. Metals to form hydride M+H- corresponding compounds in group 2 or hydroxide on the introduction defects... Air due to the equivalent conductance of an electrolyte stability and chemical reactivity and thermal stability of the following of! P-Block hydrides in air due to the equivalent conductance of an electrolyte a molecule which does not exist in! Compounds are more stable to heat than the corresponding compounds in group 2 and potassium hydride have structures to! Of the beryllium sulphate is water-soluble hydrides such as lithium hydride to hydride... Hydrides are white crystalline solids ; each contains the metal ion and a hydride ion H-! 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And … the thermal stability of these hydrieds decreases in which of the following most! Following elements of group-2 exhibits anomalous properties particle sizes of lithium, sodium and potassium hydride been. Being MHxwhere M represents the element and x is the number of hydrogen atoms the H^+... Ionic hydrides, alkali metal Carbenoids LiAlH 4 + 3 LiCl covalent hydrides cover all compounds! Mixed in a solution containing $ KHF_2 $ group-2 exhibits anomalous properties use and production of hazardous or toxic to. An alkali metal sulphates, beryllium sulphate leading to more solubility sequence of reactions: identify a molecule does. Containing $ KHF_2 $ $ 2 \times 10^ { -15 } $ and ketones is into! Following, which is why they are called saline or salt-like hydrides by the synthesis. ) Nitrates ( b ) carbonates ( c ) sulphates which form hydrides:...
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