Post Utme Chemistry Past Questions and Answers

Question 951:

Which of these does not affect the rate of a particular chemical reaction?

A. The order of the reaction
B. The size of the particles of the reactants
C. The temperature of the reaction
D. The concentration of the reactants

Question 952:

The type of reaction an alkanoic acid cannot undergo is ____________

A. Oxidation
B. Combustion
C. Decomposition
D. Esterification

Question 953:

Which of the followings will'change the equilibrium constant of the reaction
\(CO _{( g )}+ H _{2} O _{(9)} \rightarrow CO _{2(g)}+ H _{2( g )}\) ?

A. Increase in temperature
B. Increase in concentration of \(CO\)
C. Removal of \(CO _{2}\) from the mixture
D. Decrease of pressure

Question 954:

In the electrolysis of acidified water using platinum electrodes, \(1 dm ^{3}\) of oxygen was collected at s.t.p. by passing \(4.5\) amperes into the electrolytic cell. Calculate the time required to set this amount of gas free.
[Molar volume of gas at s.t.p. \(=22.4 dm ^{3}, 1\) Faraday \(=96500\) coloumbs]

A. \(40.4\) mins
B. \(63.8\) mins
C. \(55.5\) mins
D. \(5.68\) mins

Question 955:

Two plugs of glass wool soaked in concentrated ammonia and concentrated hydrochloric acid are placed at the opposite ends of a long tube such that the distance between them is \(100 cm\). The ratio of the distance covered by ammonia to that covered by hydrochloric acid when a white smoke is first noticed is ____________

A. \(2.140\)
B. \(1.465\)
C. \(0.982\)
D. \(0.476\)