In which of the following reactions, the equivalent mass of the underlined species is equal to its molecular mass?
Correct code is : -

Question

In which of the following reactions, the equivalent mass of the underlined species is equal to its molecular mass? Correct code is : -

TestHub · Accepted Answer

Equivalent mass = Molecular mass when n-factor = 1.

In (b), Na₂S₂O₃ loses 1 electron per mole, so its n-factor is 1 and equivalent mass equals molecular mass.

In (c), Cu²⁺ is reduced to Cu⁺ (change in oxidation state = 1), hence n-factor = 1 and equivalent mass equals molecular mass.

In (a), H₃PO₄ donates 2 H⁺ ions (n-factor = 2), and in (d), NH₂OH undergoes oxidation with n-factor = 2.

Therefore, only (b) and (c) satisfy the condition.

Chemistry - Redox Reactions Question with Solution | TestHub