Post Utme Chemistry Past Questions and Answers

Question 971:

Which of the following is composed of the element, \(H , O\), Al, and Si?

A. Urea
B. Silica
C. Bauxite
D. Clay

Question 972:

Which of the following is not a chemical reaction?

A. Burning of bush
B. Rusting of iron
C. Decay of bitter leaves
D. Dissolution of potassium hydroxide pellets

Question 973:

What condition favours the formation of the product for the endothermic reaction, \(N _{2} O _{4( g )} \leftrightarrow 2 NO _{2( g )}\) ?

A. A decrease in pressure
B. A decrease in volume
C. An increase in pressure
D. A constant volume

Question 974:

What is the percentage yield of water if \(0.90 g\) of water is obtained when \(29.0 g\) of butane is burned in excess oxygen?

A. \(0.02 \%\)
B. \(0.20 \%\)
C. \(2.0 \%\)
D. \(10.0 \%\)

Question 975:

The order of reactivity of five metals is \(P > Q > R > S\) \(> T\). Which of the following reactions can occur spontaneously?

A. \(T+P^{+} \rightarrow T^{+}+P\)
B. \(Q+T^{+} \rightarrow Q^{+}+T\)
C. \(R+Q^{+} \rightarrow R^{+}+Q\)
D. \(T+R^{+} \rightarrow T^{+}+R\)