Post Utme Chemistry Past Questions and Answers

Question 441:

Under normal condition of ionic addition, what will be major product of the addition of \(\mathrm{HBr}\) to 2-methy-2butene.

A. 2-Brorno-3-methylbutane
B. 1-Bromo-3-methylbutanc
C. 2-methyl-1-bromobutane
D. 2-Bromo-2-methyibutane

Question 442:

What is the percentage by mass of oxygen in \(\mathrm{Al}_{2}\left(\mathrm{SO}_{4} \right)_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O} ?\)

\((A l=27, S=32, H=1, O=16)\)

A. \(14.29 \%\)
B. \(2539 \%\)
C. \(50.79 \%\)
D. \(59.25 \%\)

Question 443:

What volume of \(0.5\) moldm-3 \(\mathrm{H}_{2} \mathrm{O}_{4}\) will exactly neutralize \(20 \mathrm{~cm}^{3}\) of \(0.1 \mathrm{moldm}^{-3} \mathrm{NaOH}\) solution?

A. \(2.0 \mathrm{~cm}^{3}\)
B. \(5.0 \mathrm{~cm}^{3}\)
C. \(6.8 \mathrm{~cm}^{3}\)
D. \(8.3 \mathrm{~cm}^{3}\)

Question 444:

What volume of gas is evolved at s.t.p if \(2 \mathrm{~g}\) of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?

\((\mathrm{Ca}=40, \mathrm{C}=12, \mathrm{O}=16, \mathrm{Cl}=35\), \(\mathrm{H}=1\), molar volume of gas at s.t.p. \(=-22.4 \mathrm{dm}^{3}\) )

A. \(112 \mathrm{~cm}^{3}\)
B. \(224 \mathrm{~cm}^{3}\)
C. \(448 \mathrm{~cm}^{3}\)
D. \(2240 \mathrm{~cm}^{3}\)

Question 445:

Which experiment led to measurement of charge on an electron?

A. Mass spectrometric experiment
B. Oil-drop experiment
C. Scattering a-particle
D. Discharge-tube experiment