JEE (Advanced) 2022 Paper-2

If empirical formula of compound 3 is P$$_3$$Q$$_4$$, then the empirical formula of compound 2 is P$$_3$$Q$$_5$$.

If empirical formula of compound 3 is P$$_3$$Q$$_2$$ and atomic weight of element P is 20, then the atomic weight of Q is 45.

If empirical formula of compound 2 is PQ, then the empirical formula of the compound 1 is P$$_5$$Q$$_4$$.

If atomic weight of P and Q are 70 and 35, respectively, then the empirical formula of compound 1 is P$$_2$$Q.

For the reaction, M(s) + 2H$$^+$$(aq) $$\to$$ H$$_2$$(g) + M$$^{2+}$$(aq), if $$\dfrac{dE_{cell}}{dT} = \dfrac{R}{F}$$, then the entropy change of the reaction is R (assume that entropy and internal energy changes are temperature independent).

The cell reaction, Pt(s) | H$$_2$$(g, 1bar) | H$$^+$$(aq, 0.01M) || H$$^+$$(aq, 0.1M) | H$$_2$$(g, 1bar) | Pt(s), is an entropy driven process.

For racemization of an optically active compound, $$\Delta$$S > 0.

$$\Delta$$S > 0, for [Ni(H$$_2$$O)$$_6$$]$$^{2+}$$ + 3 en $$\to$$ [Ni(en)$$_3$$]$$^{2+}$$ + 6H$$_2$$O (where en = ethylenediamine).

B

B$$_2$$H$$_6$$

B$$_2$$O$$_3$$

HBF$$_4$$

Limestone is used to remove silicate impurity.

Pig iron obtained from blast furnace contains about 4% carbon.

Coke (C) converts CO$$_2$$ to CO.

Exhaust gases consist of NO$$_2$$ and CO.

Compounds P and Q are carboxylic acids.

Compound S decolorizes bromine water.

Compounds P and S react with hydroxylamine to give the corresponding oximes.

Compound R reacts with dialkylcadmium to give the corresponding tertiary alcohol.

The polymerization of chloroprene gives natural rubber.

Teflon is prepared from tetrafluoroethene by heating it with persulphate catalyst at high pressures.

PVC are thermoplastic polymers.

Ethene at 350-570 K temperature and 1000-2000 atm pressure in the presence of a peroxide initiator yields high density polythene.