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. $3.2g$

Question 7:

What is the concentration of $H^{+}$ion in mole's per $dm3$ 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 $50cm3$ of a saturated solution of a sugar (molar mass $342.0g$ / at $404c$ was evaporated to dryness $31.2g$ of dry solid was obtained. The solubility of sugar at ${40}^{\circ }C$ is _____________

A. $10.0$ moles $c{m}^3$
B. $7.$ Omoles $d{m}^{-3}$
C. 3.5 moles dm \(dm ^{-3}\
D. 6 moles $d{m}^{-4}$

Question 9:

When $H2S$ 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 $F{e}^{2+}$
C. $F{e}_2{}^{+}$ions are oxidized by $F{e}^{2+}$ ions
D. $F{e}^{2+}$ ions are reduced to $F{e}^2$ ions

Question 10:

The oxide that remains unchagged whentheated in hydrogen is _____________

A. $CuO$
B. $F{e}_2{O}_3$
C. $Pb{O}_2$
D. ZnP