The group reagent $NH_4Cl_{(s)}$ and aqueous $NH_3$ will precipitate which of the following ions?

Which of the following pairs cannot be distinguished by passing $H_2S$ gas?

$(Yellow\,ppt)\,T \xleftarrow{{{K_2}Cr{O_4}}} X$ $\xrightarrow{{dil.\,HCl}} Y(Yellow\,ppt) + Z \uparrow (pungent\,smelling\,gas)$. If $X$ gives green flame test,then $X$ is:

Which of the following sulphates is insoluble in water?

$A$ salt on treatment with dil. $HCl$ gives a pungent smelling gas and a yellow precipitate. The salt gives a green flame when tested. The salt solution gives a yellow precipitate with potassium chromate. The salt is:

Which of the following solutions will yield a black precipitate when $H_2S$ gas is passed through it?