1
IIT-JEE 2011 Paper 1 Offline
MCQ (More than One Correct Answer)
+2
-0.5
Extraction of metal from the ore cassiterite involves
A
carbon reduction of an oxide ore
B
self-reduction of a sulphide ore
C
removal of copper impurity
D
removal of iron impurity
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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