Statement - I: Noble gases have very high boiling points.

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Q.
Given below are two statements:

Statement - I: Noble gases have very high boiling points.

Statement -II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points.

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

1 Statement I is false but Statement II is true.

2 Both Statement I and Statement II are true.

3 Statement I is true but Statement II is false.

4 Both Statement I and Statement II are false.

Ans.
(4)

Gases which have strong intermolecular attractive forces are easy to liquefy. Noble gases are monoatomic hence non polar. As a result, intermolecular forces for noble gases are weak London dispersion forces. Hence these are difficult to liquefy and have low boiling point.

Solution

1 Statement I is false but Statement II is true.

2 Both Statement I and Statement II are true.

3 Statement I is true but Statement II is false.

4 Both Statement I and Statement II are false.

Ans.
(4)

Gases which have strong intermolecular attractive forces are easy to liquefy. Noble gases are monoatomic hence non polar. As a result, intermolecular forces for noble gases are weak London dispersion forces. Hence these are difficult to liquefy and have low boiling point.

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Solution

1 Statement I is false but Statement II is true.

2 Both Statement I and Statement II are true.

3 Statement I is true but Statement II is false.

4 Both Statement I and Statement II are false.

Ans. (4) Gases which have strong intermolecular attractive forces are easy to liquefy. Noble gases are monoatomic hence non polar. As a result, intermolecular forces for noble gases are weak London dispersion forces. Hence these are difficult to liquefy and have low boiling point.

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Ans.
(4)

Gases which have strong intermolecular attractive forces are easy to liquefy. Noble gases are monoatomic hence non polar. As a result, intermolecular forces for noble gases are weak London dispersion forces. Hence these are difficult to liquefy and have low boiling point.