Question 11
Which of the following metals exist in their native state in nature?
(i) $Cu$
(ii) $Au$
(iii) $Zn$
(iv) $Ag$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

Q. Out of the following metals, which will give

H_{2}

on reaction with

N a O H

I . Z n I I . M g

I I I . A l I V . B e

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Which of the following is produced by the reaction of zinc metal, Zn and hydrochloric acid, HCl?I. H2(g)II. Cl2(g)III. Zn2+(aq)

The correct option is D I and III onlyH2 and Zn2+ is produced by the reaction of zinc metal, Zn, and hydrochloric acid, HCl.Zn+2HCl→ZnCl2+H2

Which of the following is produced by the reaction of zinc metal, $Z n$ and hydrochloric acid, $H C l$ ?
I. $H_{2} (g)$
II. $C l_{2} (g)$
III. $Z n^{2 +} (a q)$

The correct option is D I and III only
$H_{2}$ and $Z n^{2 +}$ is produced by the reaction of zinc metal, $Z n$ , and hydrochloric acid, $H C l$ .
$Z n + 2 H C l \to Z n C l_{2} + H_{2}$