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1. Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
A II, Ill in haematite and Ill in magnetite
B II, Ill in haematite and II in magnetite
C II in haematite and II, Ill in magnetite
D Ill in haematite and II, Ill in magnetite
2. Among the following complexes (K-P),
K3[Fe(CN)6] (K), [Co(NH3)6]C13 (L), Na3[Co(oxalate)3] (M),
[Ni(H20)6]C12 (N), K2[Pt(CN)4] (0) and [Zn(H20)6](NO3)2 (P) the diamagnetic complexes are
A K, L, M, N
B K, M, 0, P
C L, M, 0, P
D L, M, N, 0
3. Passing H2S gas into a mixture of Mn2+ , Ni2+ , Cu2+ and Hg2+ ions in an acidified aqueous solution precipitates
A CuS and HgS
B MnS and CuS
C MnS and NiS
D NiS and HgS
4. Consider the following cell reaction:
2Fes) + 02(g) + 4H+(aq) ---> 2Fe2+(aq) + 2H20(1) E° = 1.67 V
At [Fe2+]= 10-3 M, P(O2) = 0.1 atm and pH = 3, the cell potential at 25 °C is
(A) 1.47 V (B) 1.77 V (C) 1.87 V (D) 1.57 V
A A
B B
C C
D D
5. The freezing point (in °C) of a solution containing 0.1 g of K3[Fe(CN)6] (Mol. Wt. 329) in
100 g of water (Kf = 1.86 K kg mol 1) is
(A) -2.3 x 10 2 (B) -5.7 x 10 2 (C) -5.7 x 103 (D) -1.2 x 102
A A
B B
C C
D D

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