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11.

 An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and the filtrate (Q). The precipitate  P was found to dissolve in hot water. The filtrate (Q) remained unchanged when treated with H2 S in a dilute mineral acid medium. However, it gave a precipitate (R)   with H2 S  in an ammonical medium. The precipitate R gave a coloured solution (S) when treated with H2O2 in an aqueous NaOH medium.

 The precipitate P contains


A) $Pb^{2+}$

B) $Hg^{2+}_{2}$

C) $Ag^{+}$

D) $Hg^{2+}$



12.

The thermal dissociation of equilibrium of CaCO3 (s)  is studied under different conditions.

 $CaCO_{3}(s)\rightleftharpoons CaO(s)+ CO_{2}(g)$

 For this equilibrium , the correct statement (s) is (are)


A) $ \triangle H$ is dependent on T

B) K is independent of the initial amount $CaCO_{3}$

C) K is dependent on the pressure of $CO_{2}$ at given T

D) $ \triangle H$ is independent of the catalyst , if any



13.

The carbon-based reduction method is not used for extraction of 


A) tin from $SnO_{2}$

B) iron from $Fe_{2}O_{3}$

C) aluminium from $Al_{2}O_{3}$

D) magnesium from $MgCO_{3},CaCO_{3}$



14.

In the nuclear transmutation   $^{9}_{4}Be+X\rightarrow ^{9}_{4}Be+Y$ (X,Y) is (are)


A) $(\gamma,n)$

B) (p,D)

C) (n,D)

D) $(\gamma,p)$



15.

The correct statement(s) about O3 is (are)


A) O-O bond lengths are equal

B) thermal decomposition of $O_{3}$ is endothermic

C) $O_{3}$ is diamagnetic in nature

D) $O_{3}$ has a bent structure



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