Q26 of 39 Page 305

Comment on each of the following observations:

for M2+ (aq) + 2e– → M(s) (where M = Ca, Sr or Ba) is nearly constant.

E° of any M2+/ M electrode depends upon the following three factors:


⇒ Enthalpy of vaporization


⇒ Ionization enthalpy


⇒ Enthalpy of hydration


Since, the combining effect of three factors is approximately the same for Ca, Sr ad Ba, therefore, their electrode potentials are nearly constant.


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26

Comment on each of the following observations:

The mobilities of the alkali metal ions in aqueous solution are Li+ < Na+ < K+ < Rb+ < Cs+

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Comment on each of the following observations:

Lithium is the only alkali metal to form a nitride directly.

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State as to why

a solution of Na2CO3 is alkaline?

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State as to why

alkali metals are prepared by electrolysis of their fused chlorides?