Statement I: Nitrogen gas effuses faster than oxygen gas.
Statement II: Nitrogen gas has a molecular mass of $14 g / m o l$ while oxygen gas has a molecular mass of $16 g / m o l$ .

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

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Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

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Statement I is correct, but Statement II is incorrect.

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Statement I is incorrect, but Statement II is correct.

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Solution

The correct option is C Statement I is correct, but Statement II is incorrect.
Option C is the correct answer.
Statement 1 is correct. Nitrogen gas effuses faster than Oxygen gas. This is because, Nitrogen is a lighter gas than Oxygen.
Statement 2 is false. The reason being, molecular mass of Nitrogen is $28 g / m o l$ and the molecular mass of Oxygen is $32 g / m o l$ . This is because each molecule of Nitrogen or Oxygen is made up of two atoms of Nitrogen or Oxygen respectively.

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Statement I: Nitrogen gas effuses faster than oxygen gas.Statement II: Nitrogen gas has a molecular mass of 14 g/mol while oxygen gas has a molecular mass of 16 g/mol.

Statement I: Nitrogen gas effuses faster than oxygen gas.
Statement II: Nitrogen gas has a molecular mass of $14 g / m o l$ while oxygen gas has a molecular mass of $16 g / m o l$ .