1
JEE Advanced 2013 Paper 2 Offline
MCQ (Single Correct Answer)
+3
-1

An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and a filtrate (Q). The precipitate (P) was found to dissolve in hot water. The filtrate (Q) remained unchanged, when treated with H2S in a dilute mineral acid medium. However, it gave a precipitate (R) with H2S in an ammoniacal medium. The precipitate R gave a coloured solution (S), when treated with H2O2 in an aqueous NaOH medium.

The coloured solution S contains

A
$$F{e_2}{(S{O_4})_3}$$
B
$$CuS{O_4}$$
C
$$ZnS{O_4}$$
D
$$N{a_2}Cr{O_4}$$
2
IIT-JEE 2011 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution.

The metal rod M is
A
Fe
B
Cu
C
Ni
D
Co
3
IIT-JEE 2011 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution.

The compound N is

A
AgNO3
B
Zn(NO3)2
C
Al(NO3)3
D
Pb(NO3)2
4
IIT-JEE 2011 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

When a metal rod M is dipped into an aqueous colourless concentrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH3 dissolves O and gives an intense blue solution.

The final solution contains :

A
$${[Pb{(N{H_3})_4}]^{2 + }}$$ and $${[CoC{l_2}]^{2 - }}$$
B
$${[Al{(N{H_3})_4}]^{3 + }}$$ and $${[Cu{(N{H_3})_4}]^{2 + }}$$
C
$${[Ag{(N{H_3})_2}]^ + }$$ and $${[Cu{(N{H_3})_4}]^{2 + }}$$
D
$${[Ag{(N{H_3})_2}]^ + }$$ and $${[Ni{(N{H_3})_6}]^{2 + }}$$
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