KVPY Government Jobs Exams

If EºFe2+ / Fe = –0.440 V and Fe3+ / Fe2+ Eº = 0.770 V, then EºFe3+ / Fe is-
(A) 0.330 V (B) –0.037 V (C) –0.330 V (D) –1.210 V

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KVPY Other Question

MnO4
– oxidizes (i) oxalate ion in acidic medium at 333 K and and (ii) HCl. For balanced chemical
equations, the ratios [MnO4
– : C2O4
2–] in (i) and [MnO4
– : HCl] in (ii), respectively, are-
(A) 1 : 5 and 2 : 5 (B) 2 : 5 and 1 : 8 (C) 2 : 5 and 1 : 5 (D) 5 : 2 and 1 : 8 The electron in hydrogen atom is in the first Bohr orbit (n = 1). The ratio of transition energies, E(n = 1 → n
= 3) to E(n = 1 → n = 2), is-
(A) 32/27 (B) 16/27 (C) 32/9 (D) 8/9