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Assertion : Hydrides of group-16 elements show volatility in the order : 

H2O > H2S > H2Se > H2Te

Reason : Electronegativity of group-16 elements increases down the group from oxygen to tellurium.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

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1 Answers

The correct option is (d) A and R are false.

Explanation:

Hydrides of group-16 elements show volatility in the order : 

H2S > H2Se > H2Te > H2O 

Oxygen is most electronegative than other elements of group-16, it undergoes hydrogen bonding. Due to strong intermolecular hydrogen bonding in H2O, it shows lowest volatility. 

As the size of the atom increases regularly from sulphur to tellurium, van der Waals' forces of attraction increase and hence volatility decreases from H2S to H2Te.

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