(A) : The reacting gases combine in volumes that are ratios of small whole numbers.
(R) : The partial pressure of a gas in a mixture is given by its mole fraction times the total pressure of the mixture.

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

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

(A) is True but (R) is false

Both (A) and (R) are false

answer is B.

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Detailed Solution

Dalton's law of partial pressures states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.
The ratio of partial pressure of a gas to the total pressure is equal to the mole fraction of the gas.
The Gay Lussac’s law of combining volumes states that the ratio of volumes of reacting gases are small whole numbers at same temperature and pressure.
The ratio of volume of the reacting gases to the volume of product gases can be expressed in simple whole numbers.
So, both (A) and (R) are correct but, (R) is not the correct explanation of (A).

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