A mixture of two salts is used to prepare a solution $\mathrm{S},$ which gives the following results:

$\mathrm{White} \mathrm{precipitate}\left(\mathrm{s}\right) \mathrm{only}\underset{\mathrm{Room} \mathrm{temperature}}{\overset{\mathrm{Dilute} \mathrm{NaOH}\left(\mathrm{aq}\right)}{\leftarrow }}\underset{\left(\mathrm{aq}. \mathrm{solution} \mathrm{of} \mathrm{the} \mathrm{salts}\right)}{\mathrm{S}}\underset{\mathrm{Room} \mathrm{temperature}}{\overset{\mathrm{Dilute} \mathrm{HCl}\left(\mathrm{aq}\right)}{\to }}\mathrm{White} \mathrm{precipitate}\left(\mathrm{s}\right) \mathrm{only}$

The correct option $\left(\mathrm{s}\right)$ for the salt mixture is(are)

• Correct answer
  A

  $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$ and $\mathrm{Zn}{\left({\mathrm{NO}}_3\right)}_2$
• Correct answer
  B

  $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$ and $\mathrm{Bi}{\left({\mathrm{NO}}_3\right)}_3$
• C

  ${\mathrm{AgNO}}_3$ and $\mathrm{Bi}{\left({\mathrm{NO}}_3\right)}_3$
• D

  $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$ and $\mathrm{Hg}{\left({\mathrm{NO}}_3\right)}_2$

Hence, the correct answer is options: 'A', 'B'.