IIT-JEE Exam

The freezing point (in oC) 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

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IIT-JEE Other Question

The activity of a freshly prepared radioactive sample is 10^10 disintegrations per second, whose mean life is
10^9 s. The mass of an atom of this radioisotope is 10^-25 kg. The mass (in mg) of the radioactive sample is Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
(A) II, III in haematite and III in magnetite (B) II, III in haematite and II in magnetite
(C) II in haematite and II, III in magnetite (D) III in haematite and II, III in magnetite