Post Utme Chemistry Past Questions and Answers

Question 221:

Rusting of iron is a ____________

A. Redox reaction
B. Decomposition reaction
C. Catalytic reaction
D. Reversible reaction

Question 222:

Hydration of ions in solution is associated with 4. If a reaction is exothermic and there is a great disorder, it means ____________

A. Absorption of heat
B. Reduction of heat
C. Conduction of heat
D. Liberation of heat

Question 223:

A current was passed for 10 mins 20 secs and \(0.1\) mole of \(\mathrm{Cu}\) was deposited. How many grams of silver will be deposited by the same quantity of electricity? \((\mathrm{Ag}=108)\)

A. \(10.8 \mathrm{~g}\)
B. \(21.6 \mathrm{~g}\)
C. \(5.4 \mathrm{~g}\)
D. \(108 \mathrm{~g}\)

Question 224:

What is the \(\mathrm{pH}\) of \(0.001 \mathrm{~mol}\) \(\mathrm{dm}^{-3}\) of \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

A. 3
B. \(2.7\)
C. 2
D. 4

Question 225:

The gasification of coke is used for the manufacture of ____________

A. Natural gas
B. Producer gas
C. Synthetic gas
D. Industrial gas