Which of following represents the correct order of melting point of hydrides of group -16?

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H2O >, H2S > H2Se > H2Te

H2O > H2S > H2Te > H2Se

H2O > H2Te > H2Se > H2S

H2O > H2Se > H2Te > H2S

answer is C.

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Detailed Solution

Melting point:H2O>H2Te>H2Se>H2S(373)>(222)>(208)>(188)KIn H2O ⇒ H-bondingH2Se⇒ Decreased molecular massH2S ⇒ Very less molecular mass

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