Post Utme Ladoke Akintola University of Technology Chemistry Past Questions and Answers

Question 6:

0 . 1 Faraday of electricity was passed through a solution copper(II) sulphate. The maximumeright of copper deposited on the cathode would be _____________

A. \(63.Og\)
B. 32 . Og
C. 6.1 g\
D. \(3.2 g\)

Question 7:

What is the concentration of \(H ^{+}\)ion in mole's per \(dm 3\) of the solution of _____________

A. \(4.0 \times 10^{-2}\)
B. \(4.0 \times 10^{-3}\)
C. \(4.0 \times 10^{-4}\)
D. \(4.0 \times 10^{-6}\)

Question 8:

When \(50 cm 3\) of a saturated solution of a sugar (molar mass \(342.0 g\) / at \(404 c\) was evaporated to dryness \(31.2 g\) of dry solid was obtained. The solubility of sugar at \(40^{\circ} C\) is _____________

A. \(10.0\) moles \(cm ^{3}\)
B. \(7 .\) Omoles \(dm ^{-3}\)
C. 3.5 moles dm \(dm ^{-3}\
D. 6 moles \(dm ^{-4}\)

Question 9:

When \(H 2 S\) is passed into a solution of iron (III) chlofide, the colour changes form yellow to green. This is because _____________

A. \(H _{2} S\) is reduced to \(S\)
B. \(H _{2} S\) ion. are oxidized by \(Fe ^{2+}\)
C. \(Fe _{2}{ }^{+}\)ions are oxidized by \(Fe ^{2+}\) ions
D. \(Fe ^{2+}\) ions are reduced to \(Fe ^{2}\) ions

Question 10:

The oxide that remains unchagged whentheated in hydrogen is _____________

A. \(CuO\)
B. \(Fe _{2} O _{3}\)
C. \(PbO _{2}\)
D. ZnP