Problem 56
The vapour density of gas \(A\) is four times that of \(B\). If the molecular mass of \(\mathrm{B}\) is \(\mathrm{M}\) then the molecular mass of \(A\) is (1) \(\mathrm{M}\) (2) \(2 \mathrm{M}\) (3) \(\mathrm{M} / 4\) (4) \(4 \mathrm{M}\)
Problem 58
An oxide of metal (M) has \(40 \%\) by mass of oxygen. Metal \(\mathrm{M}\) has a relative atomic mass of 24 . The empirical formula of oxide is (1) \(\mathrm{M}_{2} \mathrm{O}\) (2) \(\mathrm{M}_{2} \mathrm{O}_{3}\) (3) MO (4) \(\mathrm{M}_{3} \mathrm{O}_{4}\)
Problem 59
\(\Lambda\) compound \((60 \mathrm{~g})\) on analysis \(\operatorname{gave} \mathrm{C}=24 \mathrm{~g}, \mathrm{II}=4 \mathrm{~g}\), \(\mathrm{O}=32 \mathrm{~g} .\) Its empirical formula is (1) \(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\) (2) \(\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}_{2}\) (3) \(\mathrm{CH}_{2} \mathrm{O}_{2}\) (4) \(\mathrm{CH}_{2} \mathrm{O}\)
Problem 61
An organic compound on analysis was found to contain \(0.032 \%\) sulphur. The molecular mass of the compound, if its molecule contains two sulphur atoms is (1) 200 (2) 2000 (3) 20,000 (4) \(2,00,000\)
Problem 66
In a clinical laboratory, a sample of urine containing \(0.120 \mathrm{~g}\) of urea \(\mathrm{NH}_{2} \mathrm{CONH}_{2}\) (M. Wt. 60) was treated with excess of nitrous acid. The urea reacted according to the following equation \(\mathrm{NH}_{2} \mathrm{CONH}_{2}+2 \mathrm{HNO}_{2} \longrightarrow \mathrm{CO}_{2}+2 \mathrm{~N}_{2}+3 \mathrm{H}_{2} \mathrm{O}\) The gas formed was passed through aqueous sodium hydroxide and final volume is measured at STP. What was the volume? (1) \(89.6 \mathrm{cc}\) (2) \(179.2 \mathrm{cc}\) (3) \(44.8 \mathrm{cc}\) (4) \(22.4 \mathrm{cc}\)
Problem 73
What volume of \(\mathrm{CO}_{2}\) measured at STP can be obtained by reacting \(50 \mathrm{~g} \circ \mathrm{f} \mathrm{CaCO}_{3}\) with excess hydrochtoric acid? \(\mathrm{CaCO}_{3}\) ? \(2 \mathrm{IICl} \longrightarrow \mathrm{CaCl}_{2}+\mathrm{II}_{2} \mathrm{O}+\mathrm{CO}_{2}\) (1) \(22.4\) litrcs (2) \(11.2\) litres (3) \(1.12\) litres (4) \(44.8\) litres
Problem 74
In the hydrogenation of pheny 1 ethylene \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}=\mathrm{CH}_{2}\) using a platinum catalyst the volume of hydrogen (measured at STP) that reacts with one mole of phenyl ethylene could be (1) \(11.2\) litres (2) \(22.4\) litres (3) \(44.8\) litres (4) 1 litre
Problem 77
A certain grade coal contains \(1.6\) per cent sulphur. Assuming that on burning the coal, \(\mathrm{S}\) in it is oxidised to \(\mathrm{SO}_{2}\), how many moles of \(\mathrm{SO}_{2}\) would be formed on burning 1 metric ton \((1000 \mathrm{~kg})\) of coal? (1) 16 (2) \(16000 \times \frac{2}{64}\) (3) \(16000 \times \frac{2}{32}\) (4) \(\frac{16000}{64}\)
Problem 78
The amount of a given product calculated to be obtained in a chemical reaction that goes to completion is (1) The per cent efficiency of the reaction (2) The yield of the reaction (3) The theoretical yield of the reaction (4) None of the above
Problem 79
\(5.6 \mathrm{~g}\) of carbon monoxide is heated with excess of \(\mathrm{O}_{2}\) to form carbon dioxide. What is the theoretical yield in grams of carbon dioxide \(\left(2 \mathrm{CO}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{CO}_{2}\right) ?\) (1) \(44 \mathrm{~g}\) (2) \(88 \mathrm{~g}\) (3) \(4.4 \mathrm{~g}\) (4) \(8.8 \mathrm{~g}\)
