Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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

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

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

A IS TRUE : one litre of water is 1000 grams, if this weight divided by molecular weight we get number of moles i.e 55.55

R is TRUE : Water has its maximum density of 1g/cm3 or 1000 kg/m³ at 4^∘C. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1g/cm³. Water has the maximum density of 1g/cm3 only when it is pure water. 18 grams is the gram molecular weight of water therefore one mole

EXPLANATION : 1000 ml of water will become 1000g , as the density is 1gm/ml, hence 1000 divided by 18 will give 55.55 moles, hence R is explanation of A

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