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Q.

Identify the correct order of thermal stability of hydrides of Ca, Sr and Ba.

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a

${CaH}_{2} > {SrH}_{2} > {BaH}_{2}$

b

${BaH}_{2} > {CaH}_{2} > {SrH}_{2}$

c

${CaH}_{2} > {BaH}_{2} > {SrH}_{2}$

d

${BaH}_{2} > {SrH}_{2} > {CaH}_{2}$

answer is A.

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Detailed Solution

The thermal stability of hydrides decreases on descending the Group 2. The correct order of thermal stability of hydroxide is

${CaH}_{2} > {SrH}_{2} > {BaH}_{2}$

On moving down the group, the lattice enthalpy increases and the thermal stability increases.

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Identify the correct order of thermal stability of hydrides of Ca, Sr and Ba.