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Physics

Two radioactive materials X₁ and X₂ have decay constants 10

and

respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of X2 will be 1/e after a time

Chemistry

Chlorobenzene can be prepared by reacting aniline with

(a) hydrochloric acid
(b) cuprous chloride
(c) chlorine in presence of anhydrous aluminium chloride
(d) nitrous acid followed by heating with cuprous chloride

Mathematics

If g(x) is a polynomial satisfying g(x).g(y) = g(x) + g(y) + g (xy) – 2 for all real x and y and g (2) = 5 then

is

(a) 9 (b) 25 (c) 10 (d) None of these

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