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Using Victor Meyer's method, \(0.2 \mathrm{~g}\) of an organic substance displaced \(56 \mathrm{~mL}\) of air at STP. The molecular weight of the compound is (a) 112 (b) 56 (c) 80 (d) 28

What is the molecular formula of a compound, whose empirical formula is \(\mathrm{CH}_{2} \mathrm{O}\) and molecular weight is 90 ? (a) \(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O}_{3}\) (c) \(\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}_{3}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{3} \mathrm{O}_{4}\)

An organic compound has \(\mathrm{C}\) and \(\mathrm{H}\) percentage in the ratio \(6: 1\) and \(\mathrm{C} \%\) and \(\mathrm{O} \%\) in the ratio \(3: 4\). The compound is (a) \(\mathrm{HCHO}\) (b) \(\mathrm{CH}_{3} \mathrm{OH}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\) (d) \((\mathrm{COOH})_{2}\)

A complex compound of cobalt with the composition \(\mathrm{Co}=22.58 \%, \mathrm{H}=5.79 \%, \mathrm{~N}=32.2 \%, \mathrm{O}=12.20 \%\) and \(\mathrm{Cl}=27.17 \%\) on heating, looses ammonia to the extent of \(32.63 \%\) of its mass. The number of molecules of ammonia present in one molecule of the cobalt complex is (At. mass of \(\mathrm{Co}=58.9\) ) (a) 7 (b) 5 (c) 8 (d) 12

In the enzyme peroxidase anhydrase the percentage of selenium (Se) by mass is \(0.5 \%\). If atomic mass of Se is \(78.4 \mathrm{U}\), then minimum molecular mass of peroxidase anhydrase enzyme is (a) \(1.568 \times 10^{3} \mathrm{U}\) (b) \(1.568 \times 10^{4} \mathrm{U}\) (c) \(1.568 \mathrm{U}\) (d) \(2.136 \times 10^{4} \mathrm{U}\)

A gaseous hydrocarbon has \(85 \%\) carbon and vapour density of 28 . The possible formula of the hydrocarbon will be (a) \(\mathrm{C}_{4} \mathrm{H}_{\mathrm{g}}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{2}\) (d) \(\mathrm{C}_{3} \mathrm{H}_{6}\)

An organic compound contains \(49.3 \%\) carbon, \(6.84 \%\) hydrogen and its vapour density is 73. Molecular formula of the compound is (a) \(\mathrm{C}_{3} \mathrm{H}_{10} \mathrm{O}_{2}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{5} \mathrm{O}_{2}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{3}^{-}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}_{2}\)

An organic compound has \(\mathrm{C}\) and \(\mathrm{H}\) percentage in the ratio \(6: 1\) and \(\mathrm{C}\) and \(\mathrm{O}\) percentage in the \(3: 4\). The compound is (a) \((\mathrm{COOH})_{2}\) (b) \(\mathrm{CH}_{3} \mathrm{OH}\) (c) HCHO (d) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)

An organic compound containing carbon, hydrogen and oxygen contains \(52.2 \%\) carbon and \(13.04 \%\) hydrogen. Vapour density of the compound is 23 . Its molecular formula will be (a) \(\mathrm{C}_{4} \mathrm{H}_{\mathrm{g}} \mathrm{O}\) (b) \(\mathrm{C}_{3} \mathrm{H}_{\mathrm{s}} \mathrm{O}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}\)

\(9.9 \mathrm{~g}\) of an amide with molecular formula \(\mathrm{C}_{4} \mathrm{H}_{5} \mathrm{~N}_{\mathrm{x}} \mathrm{O}_{\mathrm{z}}\) on heating with alkali liberated \(1.7 \mathrm{~g}\) of ammonia. If the percentage of oxygen is \(32.33 \%\), then the ratio of \(\mathrm{N}\) and \(\mathrm{O}\) atoms in the compound is (a) \(2: 1\) (b) \(1: 2\) (c) \(2: 5\) (d) \(2: 3\)