Post Utme Economics Past Questions and Answers

Question 941:

\(5.3 \mathrm{~g}\) of silver trioxonitrate (V) was dissolved in \(50 \mathrm{~cm}^3\) of water at \(25^{\circ} \mathrm{C}\). Calculate the solubility of the salt in moldm
[Ag=108, N=14, O=16]

A. \(0.312 \mathrm{moldm}^3\)
B. \(0.031 \mathrm{moldm}^3\)
C. \(0.062 \mathrm{moldm}^3\)
D. \(0.623 \mathrm{moldm}^3\)

Question 942:

Which of the following decomposition equations are correct?

A. \(\mathrm{Ag}_2 \mathrm{CO}_{3(\mathrm{~s})} \rightarrow \mathrm{Ag}_2 \mathrm{O}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}\)
B. \(2 \mathrm{PbCO}_{3(\mathrm{~s})} \rightarrow 2 \mathrm{~Pb}_{(\mathrm{s})}+2 \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
C. \(2 \mathrm{NaNO}_{3(s)} \rightarrow 2 \mathrm{NaNO}_{2(\mathrm{~s})}+\mathrm{O}_{2(\mathrm{~g})}\)
D. \(\mathrm{Ag}_2 \mathrm{CO}_{3(s)} \rightarrow \mathrm{AgO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}\)

Question 943:

In the reaction of aqueous solution of \(\mathrm{HCl}\) and \(\mathrm{NaOH}\) the heat change is heat of

A. Solution
B. Neutralization
C. Formation
D. Displacement

Question 944:

Which of the following aqueous gas is colourless and odourless?

A. \(\mathrm{NO}_2\)
B. \(\mathrm{N}_2 \mathrm{O}\)
C. \(\mathrm{O}_2\)
D. B and \(\mathrm{c}\)

Question 945:

The two hydrocarbons used as lower and upper standards for petrol are ____________

A. Isooctane and benzene
B. Heptanes and 2,2,6-trimethylpentane
C. Heptane and 2,2,4-trimethylpentane
D. Heptanes and neopentane