Redox Reactions Ques 9
9. The following redox reaction is balanced by which set of coefficients ?
[1999]
$aZn+bNO_3^{-}+cH^{+} \to dNH_4^{+}+eH_2 O+fZn^{2+}$
| 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 |
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Answer:
Correct Answer: 9.(d)
Solution:
- (d) $Zn \to Zn^{+2}+2 e^{-}$$\quad$ ……..(1)
$8 e^{-}+10 H^{+}+NO_3^{-} \to NH_4^{+}+3 H_2 O$$\quad$ ……..(2)
operate eq. $(1)$ $ \times 4 +$ eq. $(2)$ $ \times 1$
$4 Zn+10 H^{+}+NO_3^{-} \to 4 Zn^{2+}+NH_4^{+}+3 H_2 O$
BETA
