IIT-JEE Exam

Reduction of the metal centre in aqueous permanganate ion involves
(A) 3 electrons in neutral medium (B) 5 electrons in neutral medium
(C) 3 electrons in alkaline medium (D) 5 electrons in acidic medium

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IIT-JEE Other Question

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 For the first order reaction
( ) ( ) ( ) 2 5 2 2 2N O g ®4NO g + O g
(A) the concentration of the reactant decreases exponentially with time
(B) the half-life of the reaction decreases with increasing temperature
(C) the half-life of the reaction depends on the initial concentration of the reactant
(D) the reaction proceeds to 99.6% completion in eight half-life duration