Why black precipital is formed when `H_2S` is passed through `Pb^(2+)` & `Cu^(2+)` soln in 0.3 (M) HC1 solution. What is common ion effect? Give example.

When H_(2)S is passed through Hg_(2)^(2+) , we get :

Why does not ZnS get precipitated when H_2S is passed through an acidic solution of Zn -salt?

Write down the formula of the black precipitate formed when H_2S gas is passed through an aqueous solution of lead nitrate?

In qualitative analysis, a black precipitate is obtained when H_(2)S is passed through an acidified aqueous solution of a salt . A blue coloured solution is obtained on boiling the preciptate with dilute HNO_(3) . The substance obtained on addition of excess of ammonia solution to this blue solution is -

Write with balanced chemical equation what happens when Cl_2 is passed through worm Ca(OH)_2 solution.

What change of colour is observed when H_2S gas is passed through an acidified aqueous solution of potassium dichromate?

What type of sol is obtained when H_(2)S gas is passed over an aqueous solution is SO_(2) ?

What happens when Cl_2 gas is passed through cold lime solution. What is table salt?

Both Cus and ZnS are precipitated if H_(2)S gas is passed through an alkaline solution of Cu^(2+) and Zn^(2+) . Explain.