The ratio of activities of two radio nuclides A and B in a mixture at initially was found to be 5:1. After two hrs, the ratio of activities become 1: 1. If the of radio nuclide A is 25 min, then
of the radio nuclide B is (in minutes) : (approx)
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5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K
A capacitor is made of two square plates each of side 'a' making a very small angle
A solution of m-chloroaniline, m-chlorophenol and m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO3 to give fraction A. The leftover organic phase was extracted with d