Question

The following redox reaction is balanced by which set of
coefficients ? [1999]
aZn + bNO₃⁻ + cH⁺ → dNH₄⁺ + eH₂O + fZn²⁺
a b c d e f
(a) 1 1 10 1 3 1
(b) 2 2 10 2 3 2
(c) 4 2 10 1 3 4
(d) 4 1 10 1 3 4

Answer 1

answer : option (d) 4 1 10 1 3 4

let's balance it using electron balance method.

first half reaction : Zn ⇒Zn²+ +2e- ......(1)

2nd half reaction : NO₃- +10H+ +8e- ⇒NH₄+ +3H₂O ........(2)

multiplying 4 in equation (1) and then adding with equation (2)

4Zn + NO₃- + 10H+ ⇒4Zn²+ +NH₄+ +3H₂O

now comparing with given equation, aZn + bNO₃⁻ + cH⁺ → dNH₄⁺ + eH₂O + fZn²⁺

a = 4, b = 1 , c = 10 , d = 1, e = 3 and f = 4

i.e., 4 1 10 1 3 4

hence option (d) is correct choice.

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