Post Utme Chemistry Past Questions and Answers

Question 206:

In which of the following is the change in entropy positive?

A. \(2 \mathrm{H}_{2} \mathrm{O}_{(g)}+\mathrm{SO}_{(\mathrm{g})}
ightarrow 2 \mathrm{H}_{2} \mathrm{O}_{(1)}+3 \mathrm{~S}_{(\mathrm{s})}\)
B. \(\mathrm{H}_{2} \mathrm{O}_{(\mathrm{s})}
ightarrow \mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}\)
C. \(\mathrm{N}_{(9)}+3 \mathrm{H}_{2(g)}
ightarrow 2 \mathrm{NH}_{3(g)}\)
D. \(\mathrm{Cu}_{(\mathrm{aq})}^{2+}+\mathrm{Fe}_{(\mathrm{s})}
ightarrow \mathrm{Fe}_{(\mathrm{aq})}^{2+}+\) \(\mathrm{Cu}_{(\mathrm{s})}\)

Question 207:

The formation of \(\mathrm{SO}_{3}\) in the equation above will be favoured by ____________

A. Addition of \(\mathrm{SO}_{3}\)
B. High pressure
C. High temperature and low pressure
D. High temperature and addition of catalyst

Question 208:

When \({ }^{238}{ }_{92} \mathrm{U}\) emits an x-ray and a \(\beta\)-ray, the product \(X\) has a mass number and an atomic number respectively

A. 234 and 90
B. 234 and 91
C. 230 and 88
D. 238 and 93

Question 209:

The producer gas is a mixture of ____________

A. \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\)
B. \(\mathrm{CO}\) and \(\mathrm{N}_{2}\)
C. \(\mathrm{CO}\) and \(\mathrm{H}_{2}\)
D. \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\)

Question 210:

The IUPAC name of the compound below is \(\mathrm{H}_{3} \mathrm{CCH}\left(\mathrm{CH}_{3} \right) \mathrm{CHCHCH}_{3}\)

A. Hex-2-ene
B. 2-methylpent-4-ene
C. Hex-3-ene
D. 4-methylpent-2-ene