Statement I : The boiling point of hydrides of group 16 elements follow the order Statement II : On the basis of molecular mass is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding i

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Q.
Given below are two statements :

Statement I : The boiling point of hydrides of group 16 elements follow the order $H_{2} O > H_{2} Te > H_{2} Se > H_{2} S .$

Statement II : On the basis of molecular mass $H_{2} O$ is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in $H_{2} O$ , it has higher boiling point.

In the light of the above statements, choose correct answer from the options given below : [2024]

1 Both Statement I and Statement II are true.

2 Both Statement I and Statement II are false.

3 Statement I is true but Statement II is false.

4 Statement I is false but Statement II is true.

Ans.
(1)

$H_{2} O$ has higher boiling point due to extensive hydrogen bonding.

$H_{2} O > H_{2} Te > H_{2} Se > H_{2} S$
B.pt.: 373 K 269 K 232 K 213 K

Hence, both statements I and II are correct.

Solution

1 Both Statement I and Statement II are true.

2 Both Statement I and Statement II are false.

3 Statement I is true but Statement II is false.

4 Statement I is false but Statement II is true.

Ans.
(1)

$H_{2} O$ has higher boiling point due to extensive hydrogen bonding.

$H_{2} O > H_{2} Te > H_{2} Se > H_{2} S$
B.pt.: 373 K 269 K 232 K 213 K

Hence, both statements I and II are correct.

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Solution

1 Both Statement I and Statement II are true.

2 Both Statement I and Statement II are false.

3 Statement I is true but Statement II is false.

4 Statement I is false but Statement II is true.

Ans. (1) H2O has higher boiling point due to extensive hydrogen bonding. H2O>H2Te>H2Se>H2S B.pt.: 373 K 269 K 232 K 213 K Hence, both statements I and II are correct.

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Ans.
(1)

$H_{2} O$ has higher boiling point due to extensive hydrogen bonding.

$H_{2} O > H_{2} Te > H_{2} Se > H_{2} S$
B.pt.: 373 K 269 K 232 K 213 K

Hence, both statements I and II are correct.