When mixture of ${\mathrm{CuCO}}_3\cdot \mathrm{Cu}\left(\mathrm{OH}{)}_2\right(s)$ and $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\left(s\right)$ is added in dil. $\mathrm{HCl}$ solution:

When mixture of ${\mathrm{CuCO}}_3\cdot \mathrm{Cu}\left(\mathrm{OH}{)}_2\right(s)$ is added in dil. $\mathrm{HCl}$ solution colored solution and white ppt. is produced and ${\mathrm{CO}}_2$ gas is evolved. Carbon dioxide is released when copper carbonate is treated with diluted hydrochloric acid. The following reaction will obtain

${\mathrm{CuCO}}_3+\mathrm{HCl}\to {\mathrm{CuCl}}_2+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$

Sulfur dioxide gas is generated when sodium thiosulfate is treated with diluted hydrochloric acid. The reaction is having follows,

${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3+2\mathrm{HCl}\to 2\mathrm{NaCl}+{\mathrm{SO}}_2+{\mathrm{H}}_2\mathrm{O}+\mathrm{S}$

Hence, options B and C are correct.