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N₂O gas is liberated in the reaction between

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a

Zn+HNO₃(dil.)

b

Cu+HNO₃(conc.)

c

Cu+HNO₃(dil.)

d

Zn+HNO₃(conc.)

answer is C.

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Detailed Solution

$\begin{array}{l} 3Cu + 8HN{O_3}(dil.) \to 3Cu{(N{O_3})_2} + 2NO + 4{H_2}O\\ Cu + 4HN{O_3}(conc.) \to Cu{(N{O_3})_2} + 2N{O_2} + 2{H_2}O\\ 4Zn + 10HN{O_3}(dil.) \to 4Zn{(N{O_3})_2} + {N_2}O + 5{H_2}O\\ Zn + 4HN{O_3}(conc.) \to Zn{(N{O_3})_2} + 2N{O_2} + 2{H_2}O \end{array}$

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