Assertion :Helium will have fewer dispersion forces between its atoms than the other noble gases. Reason: As the mass of nonpolar atoms and molecules increases, dispersion forces increase.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Assertion
Helium will have fewer dispersion forces between its atoms than the other noble gases.
Reason
As the mass of nonpolar atoms and molecules increases, dispersion forces increase.
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Note: Due to weakest dispersion forces, 'He' has lowest boiling point among Noble gases. Due to this, He is most difficult to liquefy.
Option A is correct.

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