Post Utme Chemistry Past Questions and Answers

Question 321:

0.07g of a hydride of carbon occupies 56 at S.T.P when vaporized and contains 14.29% by mass of hydrogen. The formulaof the hydrocarbon is ____________

A. \(\mathrm{CH}_{4}\)
B. \(\mathrm{C}_{2} \mathrm{H}_{2}\)
C. \(\mathrm{C}_{2} \mathrm{H}_{4}\)
D. \(\mathrm{C}_{2} \mathrm{H}_{6}\)
E. \(\mathrm{C}_{3} \mathrm{H}_{8}\)

Question 322:

The pressure on \(100 \mathrm{~cm}^{3}\) of oxygen gas at \(35^{\circ} \mathrm{C}\) is \(750 \mathrm{~mm}\) of \(\mathrm{Hg}\). What would be the volume of the gas if the pressure is increased to \(1000 \mathrm{~mm}\) of \(\mathrm{Hg}\) without changing the temperature?\(33 / 61\)

A. \(133.3 \mathrm{~cm}^{3}\)
B. \(85 \mathrm{~cm}^{3}\)
C. \(75 \mathrm{~cm}^{3}\)
D. \(65 \mathrm{~cm}^{3}\)
E. \(58 \mathrm{~cm}^{3}\)

Question 323:

Which of the following bonds exist in crystalline ammonium chloride \(\left(\mathrm{NH}_{4} \mathrm{Cl}\right)\) ?

A. Ionic and covalent
B. Ionic and co-ordinate
C. Ionic, covalent and co-ordinate
D. Covalent, co-ordinate and metallic
E. Ionic, covalent and metallic

Question 324:

Which of the following is a neutralization reaction? Addition of ____________

A. Nitric acid to hydrochloric acid
B. Nitric acid to sulphuric acid
C. Acid to distilled water
D. Nitric acid to sodium hydroxide
E. Sodium chloride to distilled
water

Question 325:

In the preparation of carbon monoxide by heating ethanoic acid with concentrated sulphuric acid, the concentrated sulphuric acid acts as ____________

A. Oxidizing agent
B. Reducing agent
C. Dehydrating agent
D. Reaction medium
E. Catalyst