JEE (Advanced) 2013 Paper-2
The reactions of $$Cl_{2}$$ gas with cold-dilute and hot-concentrated $$NaOH$$ in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The $$Cl_{2}$$ gas reacts with $$SO_{2}$$ 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.
An aqueoussolution of a mixture of two inorganic salts, when treated with dilute $$HCL$$, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot. water. The filtrate (Q) remained unchanged, when treated with $$H_{2}S$$ in a dilute mineral acid medium. However,it gave a precipitate (R) with $$H_{2}S$$ in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with $$H_{2}O_{2}$$ in an
aqueous $$NaOH$$ medium.
P and Q are isomers of dicarboxylic acid $$C_{4}H_{4}O_{4}$$. Both decolorize $$\frac{Br}{H_{2}O}$$. On heating, P forms the cyclic anhydride.
Upon treatment with dilute alkaline $$KMnO_{4}$$, P as well as Q could produce one or more than one from S, T and U.
For the following questions answer them individually
Match the chemical conversions in List I with the appropriate reagents in List II and select the correct answer using the code given below the lists:
The unbalanced chemical reactions given in List I show missing reagent or condition (?) which are provided in List II. Match List I with List Il and select the correct answer using the code given below the lists :
The standard reduction potential data at $$25^\circ C$$ is given below.
$$E^\circ(Fe^{3+}, Fe^{2+}) = + 0.77 V$$;
$$E^\circ(Fe^{2+}, Fe) = - 0.44 V$$;
$$E^\circ(Cu^{2+}, Cu) = + 0.34 V$$;
$$E^\circ(Cu^{+}, Cu) = + 0.52 V$$;
$$E^\circ[O_2(g) + 4H^+ + 4e^{-} \rightarrow 2H_2O] = + 1.23 V$$;
$$E^\circ[O_2(g) + 2H_2O + 4e^{-} \rightarrow 4OH^{-}] = + 0.40 V$$;
$$E^\circ(Cr^{3+}, Cr) = - 0.74 V$$;
$$E^\circ(Cr^{2+}, Cr) = - 0.91 V$$
Match $$E^\circ$$ of the redox pair in List I with the values given in List II and select the correct answer using the code given below the lists:
An aqueous solution of X is added slowly to an aqueous solution of Y as shown in List J. The variation in conductivity of these reactions is given in List II. Match List I with List II and select the correct answer using the code given below the lists:
