In a gaseous reaction of the type aA + bB cC + dD, which is wrong?

MHT CET Chemistry question

In a gaseous reaction of the type aA + bB \longrightarrow cC + dD, which is wrong?

Answer: (C)

Coefficients give mole, volume (Gay-Lussac/Avogadro) and molecule ratios, so (a), (b) and (d) are right, but they

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Question ID VK-041262