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Chapter 8: Problem 26
How many atoms do mercury vapour molecules consist of if the density of mercury vapour relative to air is \(6.92\) ? The average mass of air is \(29 \mathrm{~g}\) per mole. \((\mathrm{Hg}=200)\) (a) 1 (b) 2 (c) 4 (d) Infinite
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Equal masses of oxygen, hydrogen and methane are taken in identical conditions. What is the ratio of the volumes of the gases under identical conditions? (a) \(16: 1: 8\) (b) \(1: 16: 2\) (c) \(1: 16: 8\) (d) \(2: 16: 1\)
Two successive reactions, \(\mathrm{A} \rightarrow \mathrm{B}\) and \(\mathrm{B} \rightarrow \mathrm{C}\), have yields of \(90 \%\) and \(80 \%\) respectively. What is the overall percentage yield for conversion of \(\mathrm{A}\) to \(\mathrm{C}\) ? (a) \(90 \%\) (b) \(80 \%\) (c) \(72 \%\) (d) \(85 \%\)
When burnt in air, \(14.0 \mathrm{~g}\) mixture of carbon and sulphur gives a mixture of \(\mathrm{CO}_{2}\) and \(\mathrm{SO}_{2}\) in the volume ratio of \(2: 1\), volume being measured at the same conditions of temperature and pressure. Moles of carbon in the mixture is (a) \(0.25\) (b) \(0.40\) (c) \(0.5\) (d) \(0.75\)
A volume of \(10 \mathrm{ml}\) of an oxide of nitrogen was taken in a eudiometer tube and mixed with hydrogen until the volume was \(28 \mathrm{ml} .\) On sparking, the resulting mixture occupied \(18 \mathrm{ml}\). To this mixture, oxygen was added when the volume came to \(27 \mathrm{ml}\) and on explosion again, the volume fall to \(15 \mathrm{ml}\). Find the molecular weight of the oxide of nitrogen originally taken in eudiometer tube. All measurements were made at STP.
A quantity of \(0.25 \mathrm{~g}\) of a substance when vaporized displaced \(50 \mathrm{~cm}^{3}\) of air at \(0^{\circ} \mathrm{C}\) and \(1 \mathrm{~atm} .\) The gram molecular mass of the substance will be (a) \(50 \mathrm{~g}\) (b) \(100 \mathrm{~g}\) (c) \(112 \mathrm{~g}\) (d) \(127.5 \mathrm{~g}\)
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