Post Utme Chemistry Past Questions and Answers

Question 121:

Silver chloride turns grey when exposed to sunlight because ____________

A. The silver ion is reduced to silver
B. The silver ion is oxidized to silver
C. Silver is a transition metal
D. The silver chloride forms complexes in the sun

Question 122:

Which of these compounds exhibits resonance?

A. Benzene
B. Ethanol
C. Propene
D. Butyne

Question 123:

Hydrolysis of \(\mathrm{CH}_{3} \mathrm{COOCH}_{2} \mathrm{CH}_{3}\) in dilute HCI produces ____________

A. \(\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{3} \mathrm{CH}_{3}\)
B. \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} .+\mathrm{CH}_{3} \mathrm{COCl}\)
C. \(\mathrm{CH}_{3} \mathrm{COOH} ;+\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}\)
D. \(\mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{3} \mathrm{CH}_{3}\)

Question 124:

The presence of \(\mathrm{NaCl}\) in ice will ____________

A. Iover the boiling point of \(\mathrm{NaCl}\)
B. Increase the melting point of \(\mathrm{NaCl}\)
C. Make \(\mathrm{NaCl}\) impure
D. Iower the melting point of ice

Question 125:

What are the values of \(x, y\) and \(z\) in the equation below? \(\times \mathrm{NH}_{3}+\) \(\mathrm{yO}_{2} \rightarrow \mathrm{zNO}+6 \mathrm{H}_{2} \mathrm{O}\)

A. \(2,3,4\)
B. \(4,5,4\)
C. \(6,5,4\)
D. \(2,3,4\)