Q.

The correct order of thermal stability of Hydrides of 16th group is?

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a

H2S>H2O>H2Se>H2Te>H2Po

b

H2O>H2S>H2Se>H2Te>H2Po

c

H2Po>H2Te>H2Se>H2S>H2O

d

H2O>H2Po>H2Te>H2Se>H2S

answer is D.

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Detailed Solution

The high BP of water is due to prevalence of strong inter molecular hydrogen bonding. In case of others, the hydrogen bonding is not significant. Effect of molar mass or Vander Waal's force is taken into account. As the molar mass increases, the strength of Vander Waal's forces increases and so does the BP.
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