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Q)

Which of the following statements is not correct ?

$\begin {array} {1 1} (A)\;\text{Hydrochloric acid does not react with chemically pure zinc} \\ (B)\;\text{Hot concentrated sulphuric acid reacts with both zinc and mercury forming metal sulphates and liberating sulphate dioxide} \\ (C)\;\text{Both $Zn$ and $Hg$ react with dilute $HNO_3$ liberating $NO$ gas} \\ (D)\;\text{Both $Zn$ and $Hg$ react with concentrated $HNO_3$ liberating $NO_2$ gas} \end {array}$

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A)
Answer : Both $Zn$ and $Hg$ react with dilute $HNO_3$ liberating $NO$ gas
$4Zn+10HNO_3 \rightarrow 4Zn (NO_3)_2+N_2O+5H_2O$
$ \qquad \quad (\text{dilute})$
$6Hg+8HNO_3 \rightarrow 3Hg_2(NO_3)_2+2NO+4H_2O$
$ \qquad \quad (\text{dilute})$
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