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

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By Expert Faculty of Sri Chaitanya
a
H2O >, H2S > H2Se > H2Te
b
H2O > H2S > H2Te > H2Se
c
H2O > H2Te > H2Se > H2S
d
H2O > H2Se > H2Te > H2S

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detailed solution

Correct option is C

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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The atomic number of the element next to 16S in the same group is

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