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JEE Advance - Chemistry (2013 - Paper 2 Offline - No. 17)

The reaction of Cl2 gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The Cl2 gas reacts with SO2 gas, in presence of charcoal, to give a product R. R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus, T.
The reaction of Cl2 gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The Cl2 gas reacts with SO2 gas, in presence of charcoal, to give a product R. R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus, T.
The reaction of Cl2 gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The Cl2 gas reacts with SO2 gas, in presence of charcoal, to give a product R. R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus, T.
P and Q, respectively, are the sodium salts of
Hypochlorous and chloric acids.
Hypochlorous and chlorous acids.
Chloric and perchloric acids.
Chloric and hypochlorous acids.

Explanation

The reactions involved are

Cl2 + 2NaOH (cold, dil.) $$\to$$ $$\mathop {NaOCl}\limits_{(P)} $$ + NaCl + H2O

3Cl2 + 6NaOH (hot, conc.) $$\to$$ $$\mathop {NaCl{O_3}}\limits_{(Q)} $$ + 5NaCl + 3H2O

where NaOCl and NaClO3 are salts of hypochlorous acid (HOCl) and chloric acid (HClO3), respectively.

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