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Chapter 8: Problem 44
Which of the following metals forms amphoteric oxide when it reacts with oxygen? (a) sodium (b) magnesium (c) aluminium (d) potassium
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The empirical formula of an organic gaseous compound containing carbon and hydrogen is \(\mathrm{CH}_{2}\). The volume occupied by certain mass of this gas is exactly half of the volume occupied by the same mass of nitrogen gas under identical conditions. The molecular formula of the organic gas is (a) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (b) \(\mathrm{CH}_{2}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{12}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{8}\)
How many grams of \(90 \%\) pure \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) can be produced from \(250 \mathrm{~g}\) of \(95 \%\) pure \(\mathrm{NaCl} ?\) (a) \(640.6 \mathrm{~g}\) (b) \(288.2 \mathrm{~g}\) (c) \(259.4 \mathrm{~g}\) (d) \(320.3 \mathrm{~g}\)
The concentration of same aqueous solution of glucose is determined by two students-Sawan and Gautam. Sawan reported the concentration as \(20 \%\) (w/w) and Gautam reported the concentration as \(25 \%(\mathrm{w} / \mathrm{v}) .\) If both the concentrations are correct, then the density of solution is (a) \(0.8 \mathrm{~g} / \mathrm{ml}\) (b) \(1.0 \mathrm{~g} / \mathrm{ml}\) (c) \(1.25 \mathrm{~g} / \mathrm{ml}\) (d) \(1.33 \mathrm{~g} / \mathrm{m} 1\)
The commonly used pain reliever, aspirin, has the molecular formula \(\mathrm{C}_{9} \mathrm{H}_{8} \mathrm{O}_{4} .\) If a sample of aspirin contains \(0.968 \mathrm{~g}\) of carbon, what is the mass of hydrogen in the sample? (a) \(0.717 \mathrm{~g}\) (b) \(0.0717 \mathrm{~g}\) (c) \(8.000 \mathrm{~g}\) (d) \(0.645 \mathrm{~g}\)
In Dumas method, \(0.2 \mathrm{~g}\) of an organic nitrogenous compound gave \(28 \mathrm{ml}\) of \(\mathrm{N}_{2}\) (volume reduced to \(0^{\circ} \mathrm{C}\) and \(1 \mathrm{~atm}\) ). What is the percentage of nitrogen, by mass, in the compound? (a) \(17.5\) (b) \(8.75\) (c) \(35.0\) (d) \(14.0\)
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