Name the acid which is used in the preparation of soft drinks.

What are $\mathrm{X}$ and $\mathrm{Y}$, respectively in the following reactions ?

$\mathrm{Au}+\mathrm{aqua} \mathrm{regia}⟶{\mathrm{AuCl}}_4^{-}+{\mathrm{H}}_2\mathrm{O}+\mathrm{X}$

$\mathrm{Pt}+\mathrm{aqua} \mathrm{regia}⟶{\mathrm{PtCl}}_6^{2-}+{\mathrm{H}}_2\mathrm{O}+\mathrm{Y}$

State one observation for the following:

A small piece of zinc is added to dilute hydrochloric acid.

What happens when: (write chemical equation only).

(i) Zinc reacts with dilute sulphuric acid

Which of the following statements is correct?