Multiple choice

For which following properties Li has higher value than Na? P. Hydration enthalpy Q. Thermal stability of hydride R. Stability of carbonate S. Basic character of hydroxide

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S
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A Correct answer
Explanation

The hydration enthalpies of alkali metal ions decrease with increase in ionic sizes. The correct order of hydration enthalpies of alkali metal ions is Li+ > Na+ > K+ > Rb+ > Cs+. The thermal stability of alkali metal hydrides decreases from LiH to CsH.

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