IIT-JEE Practice Set 1 Paper-2

Test Preparation on IIT-JEE solution Paper-2 (2011)

PART I : CHEMISTRY:

Among the following complexes (K – P),

K₃[Fe(CN)₆] (K), [Co(NH₃)₆]Cl₃ (L),

Na₃[Co(oxalate)₃] (M), [Ni(H₂O)₃]Cl₂ (N),

K₂[Pt(CN)₄] (O) and [Zn(H₂O)₆](NO₃)₂ (P)

the diamagnetic complexes are

1K, L, M, N
2K, M, O, P
3L, M, O, P
4 L, M, N, O

K₃Fe(CN)₆ is paramagnetic

[Ni(H₂O)₆]Cl₂ is paramagnetic too.

Consider the following cell reaction :

2Fe (s) + O₂(g) + 4H+ (aq)= 2Fe²⁺(aq) + 2H₂O (l) E° = 1.67 V

At [Fe²+] = 10^-3M, P(O₂) = 0.1 atm and pH = 3, the cell potential at 25°C is

11.47 V
21.77 V
31.87 V
41.57 V

The major product of the following reaction is

1a hemiacetal
2an acetal
3an ether
4an ester

Passing H₂S gas into a mixture of Mn²⁺, Ni²⁺, Cu²⁺ and Hg²⁺ ions in an acidified aqueous solution precipitates-

1CuS and HgS
2MnS and CuS
3MnS and NiS
4NiS and HgS

Cu²⁺ & Hg²⁺ ions belong to Group – II of salt analysis & their sulphides are very less soluble. Hence CuS and HgS will be precipitated out even in acidic medium by passing H2S gas.

Oxidation states of the metal in the minerals haematite and magnetite, respectively are-

1II, III and haematite and III in magnetite
2II, III in haematite and II in magnetite
3II in haematite and II, III in magnetite
4III in haematite and II, III in magnetite

Haematite → Fe2O3 +3
Magnetile → Fe3O4 (FeO + Fe2O3) +2, +3

Amongst the compounds given, the one that would from a brilliant colored dye on treatment with NaNO2 in dil. HCl followed by addition to an alkaline solution of β-naphthol is

Azo dye test is given by Aromatic 1° amine

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Test Preparation on IIT-JEE solution Paper-2 (2011)

PART I : CHEMISTRY: Among the following complexes (K – P), K3[Fe(CN)6] (K), [Co(NH3)6]Cl3 (L), Na3[Co(oxalate)3] (M), [Ni(H2O)3]Cl2 (N), K2[Pt(CN)4] (O) and [Zn(H2O)6](NO3)2 (P) the diamagnetic complexes are

Consider the following cell reaction : 2Fe (s) + O2(g) + 4H+ (aq)= 2Fe2+ (aq) + 2H2O (l) E° = 1.67 V At [Fe2+] = 10-3M, P(O2) = 0.1 atm and pH = 3, the cell potential at 25°C is