Why Pb `(CH_3COO)_2` do not causes black Precipitation when mixed with charcoal and `H_2S`.

When lead nitrate solution is added to an aqueous solution of H_2S , a black precipitate is obtained. However, when lead nitrate solution is added to the filtrate obtained by passing the solution of H_2S through activated charcoal, no black precipitate is obtained. Explain these observations.

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

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

An aqueous solution of a substance gives a white precipitate on treatment with dilute HCl, which dissolves on heating. On passing H_2S in hot acidic solution a black precipitate is formed. Identify the substance.

The metal ions which are precipitated when H_(2)S gas is passed in the presence of dilute HCl is :

A compound (A) after fusion with metallic sodium gives a precipitate when silver nitrate solution is added to a portion of th filtrate acidified with nitric acid. Compound (A) is likely to be: (1) CH_(3)CH_(2)CH_(2)Br (2) CH_(3)CH_(2)CHO (3) CH_(3)CH_(2)CH_(2)OH (4) CH_(3)CH_(2)COOH

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 C_2H_5OH and CH_3-COOH are mixed in equivalent proportion, equilibrium is reached when 2/3 of acid and alcohol are used. How much ester will be present when 2g molecules of acid were to react with 2g molecule of alcohol ?

CH_(3)CH_(2)CHClCH=CH_(2) is optically active. Explain why it become optically inactive when reduced with H_(2)//Pt .

What is the coordination entity formed when excess of aqueous KCN is added to aqueous solution of CuSO_(4) ? Why is it that no precipitate of copper sulphide is obtained when H_(2)S(g) is passed through this solution ?