Post Utme Chemistry Past Questions and Answers

Question 191:

What is \(\mathrm{H}_{2} \mathrm{O}_{2}\) acting as in the equation below?
$$
\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{H}^{+}+2 \mathrm{Fe}^{2+}
$$

A. Oxidizing agent
B. Reducing agent
C. An acid
D. A base

Question 192:

A current was passed for \(10 \mathrm{mins} 20\) secs and \(0.1\) mole of Cu was deposited. How many grams of silver will be deposited by the same quantity of electricity? \(\{\mathrm{Ag}=108\}\)

A. \(10.8 \mathrm{~g}\)
B. \(21.6 \mathrm{~g}\)
C. \(5.4 \mathrm{~g}\)
D. \(108 \mathrm{~g}\)

Question 193:

\(\mathrm{NO}(\mathrm{g})+\mathrm{CO}(\mathrm{g}) \rightarrow \mathrm{N}_{2}(\mathrm{~g})+\) \(\mathrm{CO}_{2}\) (g) \(\Delta \mathrm{H}=-89.3 \mathrm{KJ}\)
What conditions would favour maximum conversion of nitrogen(II) oxide and carbon(II)oxide in the reaction above?

A. Low temperature and high pressure
B. High temperature and low pressure
C. High temperature and high pressure
D. Low temperature and low pressure

Question 194:

Which of the alloys below does not contain copper?

A. Brass
B. Bronze
C. Type metal
D. Solder

Question 195:

\(2 \mathrm{Al}_{(\mathrm{s})}+2 \mathrm{NaOH}_{(\mathrm{aq})}+6 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}
ightarrow\) \(2 \mathrm{NaAl}(\mathrm{OH})_{4(\mathrm{aq})}+3 \mathrm{H}_{2(\mathrm{~g})}\)
From the equation, give the condition of reaction

A. Cold dil. \(\mathrm{NaOH}\)
B. Hot. concentrated \(\mathrm{NaOH}\)
C. Warm dilute \(\mathrm{NaOH}\)
D. Hot dilute \(\mathrm{NaOH}\)