KVPY Government Jobs Exams

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

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KVPY Other Question

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 At 300 K the vapour pressure of two pure liquids, A and B are 100 and 500 mm Hg, respectively. If in a
mixture of A and B, the vapour pressure is 300 mm Hg, the mole fractions of A in the liquid and in the
vapour phase, respectively, are-
(A) 1/2 and 1/10 (B) 1/4 and 1/6 (C) 1/4 and 1/10 (D) 1/2 and 1/6