Assertion: Equal moles of different substnaces contains same number of constituent particles.
Reason: Equal weights of different substances contain the samme number of contituent particles.

Options

A. Assertion is correct, reason is correct, reason is a correct explanation for assertion.
B. Assertion is correct, reason is correct, reason is not a correct explanation for assertion
C. Assertion is correct, reason is incorrect
D. Assertion is incorrect, reason is correct.

Explanation

Both Assertion and Reason are true but reason is not the correct explanation of assertion. Greater the number of negative atoms present in the oxy -acid make the acid stronger. In general, the strengths of acids that have general formula ` ( HO ) _ m ZO _ n` can be related to the value of n. As the value of n increases , acidic character also increases.
The negative atoms draw electrons away from the Z - atom and make it more positive. The Z - atom, therefore, becomes more effective in withdrawing electons density away from the oxygen atom that bonded to hydrogen. In turn, the electrons of H - O bond are drawn more strongly away from the H - atom. The net effect makes it easier from the proton release and increases the acid a strength.