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Two oxides of metal contain 27.6℅ and 30℅ oxygen respectively. If formula of first oxide is M3O4, then formula of second oxide is:
5.6 litres of a gas at N.T.P. are found to have a mass of 11 g. The molecular mass of the gas is
The crystalline salt, Na2SO4xH2O on heating loses 55.9% of its weight. The formula of the crystalline salt is
0.5 g of a metal on oxidation gave 0.79 g of its oxide. The equivalent weight of the metal is (approximately)
Air contains nearly 20% oxygen by volume. The volume of air needed for complete combustion of 100 cc of acetylene will be
A solution of 10 ml(M/10) FeSO4 was titrated with KMnO4 solution in acidic medium. The amount of KMnO4 used will be
At S.T.P. the density of CCl4 vapour in g/L will be nearest to
The law of multiple proportions was proposed by
The anode rays were discovered by
Which of the following transitions of electrons in the hydrogen, atom will emit maximum energy ?
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