In which of the following is lead sulfate $(PbSO_4)$ soluble?

Consider the sulphides $HgS$,$PbS$,$CuS$,$Sb_{2}S_{3}$,$As_{2}S_{3}$ and $CdS$. Number of these sulphides soluble in $50\% \ HNO_{3}$ is .... .

Which of the following basic radicals will not be precipitated by $H_2S$ gas in the presence of $NH_3$?

Which of the following radicals will not be precipitated by passing $H_2S$ in a concentrated acid solution?

$A$ salt reacts with dilute $HCl$ to produce a gas with a pungent smell and yellow crystals. When tested,the salt gives a green flame. With potassium chromate,the salt gives yellow crystals. Therefore,the salt is.......

In the fifth group of qualitative analysis,$(NH_4)_2CO_3$ is added to precipitate out the carbonates. We do not add $Na_2CO_3$ because