Question

Nitric acid $\left(HN{O}_3\right),$ also known as aqua fortis (Latin for "strong water") or spirit of niter, is a highly corrosive mineral acid. Nitric acid reacts with most metals, but the details depend on the concentration of the acid and the nature of the metal.

List-I contains chemical reactions of metals with $HN{O}_3$ and List-II contains the compound(s) formed.

$\begin{array}{ccccc}& List-I& & List-II& \\ \left(I\right)& \text{Ca with dilute and cold}HN{O}_3& \left(P\right)& \text{Metal nitrate}& \\ \left(II\right)& \text{As with concentrated}HN{O}_3& \left(Q\right)& NO& \\ \left(III\right)& \text{Zn with dilute}HN{O}_3& \left(R\right)& N{O}_2& \\ \left(IV\right)& \text{Cu with dilute}HN{O}_3& \left(S\right)& N_{2}O& \\ & & \left(T\right)& \text{Tribasic acid}& \\ & & \left(U\right)& \text{Hydrogen gas}& \end{array}$

Which of the following options has the correct combination considering List-I and List-II?

• A. $\left(III\right),\left(P\right)\left(U\right)and\left(IV\right),\left(P\right)\left(R\right)$
• B. $\left(III\right),\left(R\right)\left(T\right)and\left(IV\right),\left(P\right)\left(U\right)$
• C. $\left(III\right),\left(P\right)\left(S\right)and\left(IV\right),\left(P\right)\left(Q\right)$
• D. $\left(III\right),\left(P\right)\left(Q\right)and\left(IV\right),\left(R\right)\left(T\right)$

Answer 1

The correct option is C $\left(III\right),\left(P\right)\left(S\right)and\left(IV\right),\left(P\right)\left(Q\right)$

The corresponding reactions are:
$4Zn+10HN{O}_3\to 4Zn(N{O}_3{)}_2+N_{2}O+5H_{2}O$
$3Cu+8HN{O}_3\to 3Cu(N{O}_3{)}_2+2NO+4H_{2}O$