Post Utme Chemistry Past Questions and Answers

Question 331:

Which of the following pollutants is biodegradable?

A. Plastics
B. Sewage compounds
C. Metal scraps
D. Hydrogen sulphide

Question 332:

Which of the following equations represents the reaction leading to the removal of permanent hardness of water?

A. \(\mathrm{MgSO}_{2}+\mathrm{Na}_{2} \mathrm{CO}_{3} \quad \mathrm{MgCO}_{3}+\mathrm{Na}_{2} \mathrm{SO}_{4}\)
B. \(\mathrm{Ca}(\mathrm{OH})_{2}+2 \mathrm{HCl} \quad \mathrm{CaCl}_{2}+2 \mathrm{H}_{2} \mathrm{O}\)
C. \(\mathrm{Ca}\left(\mathrm{HCO}_{3} h_{2}+\mathrm{Ca}(\mathrm{OH})_{2} \quad 2 \mathrm{CaCO}_{2}+2 \mathrm{H}_{2} \mathrm{O} \quad\right.\)
D. \(\mathrm{MgSO}_{4}+\mathrm{BaCl}_{2} \quad \mathrm{MgCl}_{2}+\mathrm{BaSO}_{4}\)

Question 333:

How many mole of \(\mathrm{AgNO}_{s}\), are there in \(500 \mathrm{~cm}^{3}\) of \(0.01 \mathrm{M} \mathrm{AgNO}\), solution?

A. \(0.005\) mole
B. \(0.05\) mole
C. \(0.5\) mole
D. \(0.1\) mole

Question 334:

Which of the following statements explains why tetraoxosulphate (IV) acid is regarded as a strong acid?

A. Tetraoxosulphate (VI) acid is dibasic.
B. The acid is concentrated.
C. The acid is completely ionized in aqueous solution.
D. Tetraoxosulphate (VI) ions are very reactive.

Question 335:

To what temperature must a gas be raised from 273 Kin o der to double both its volume and pressure?

A. 300 K
B. 540 K
C. 819K
D. 1092