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Chapter 8: Problem 12
The reaction which is not associated with the middle region of blast furnace during smelting is
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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) \(14.0\)
An ore contains \(2.296 \%\) of the mineral argentite, \(\mathrm{Ag}_{2} \mathrm{~S}\), by mass. How many grams of this ore would have to be
Samples of \(1.0 \mathrm{~g}\) of \(\mathrm{Al}\) are treated separately with an excess of sulphuric acid and an excess of sodium hydroxide. The ratio of the number of moles of the hydrogen gas evolved is (a) \(1: 1\) (b) \(3: 2\) (c) \(2: 1\) (d) \(9: 4\)
Upon heating a litre of semi-molar \(\mathrm{HCl}\) solution, \(2.675 \mathrm{~g}\) of hydrogen chloride is lost and the volume of the solution shrinks to \(750 \mathrm{ml}\). The molarity of resultant solution is (a) \(0.569 \mathrm{M}\) (b) \(0.5 \mathrm{M}\) (c) \(0.42 \mathrm{M}\) (d) \(1.707 \mathrm{M}\)
What volume of \(0.8 \mathrm{M}-\mathrm{AlCl}_{3}\) solution should be mixed with \(50 \mathrm{ml}\) of \(0.2 \mathrm{M}-\mathrm{CaCl}_{2}\) solution to get a solution of chloride ion concentration equal to \(0.6 \mathrm{M} ?\) (a) \(5.56 \mathrm{ml}\) (c) \(50 \mathrm{ml}\)
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