Post Utme Chemistry Past Questions and Answers

Question 426:

\(\mathrm{C}_{2} \mathrm{H}_{4(\mathrm{~g})}+\mathrm{H}_{2} \rightarrow \mathrm{C}_{2} \mathrm{H}_{6} \Delta \mathrm{H}=\) \(-13 k j\).
The reaction represented above is ____________

A. Exothermic
B. Spontaneous
C. Endothermic
D. In equilibrium

Question 427:

Calculate the mass of chloride gas which occupies a volume of \(1.12 \mathrm{dm}^{3}\) at s.t.p.
\((C l=35.5\), Molar volume of gas at s.t.p. \(=22.4 \mathrm{dm}^{3}\) )

A. \(15.50 \mathrm{~g}\)
B. \(7.10 \mathrm{~g}\)
C. \(3.55 \mathrm{~g}\)
D. \(1.80 \mathrm{~g}\)

Question 428:

Calculate the number of moles of \(\mathrm{HCl}\) present in \(20 \mathrm{~cm}^{3}\) of a \(0.75 \mathrm{~m}\) solution of the acid

A. \(0.015\) mole
B. 0.038 mole
C. 3.800 mole
D. 1.500 mole

Question 429:

Chlorine consisting of 2 isotopes of mass number 35 and 37 in the ratio \(3: 1\) has an atomic mass of 35.5. Calculate the relative abundance of the isotope of number

A. 20
B. 25
C. 60
D. 75

Question 430:

How long will it take to deposit \(0.08 \mathrm{~g}\) of copper from \(\mathrm{CuCl}_{2}\) solution by passing a current of \(0.5 \mathrm{~A}\)

A. 6 mins
B. 8 mins
C. 24 mins
D. 48 mins