Post Utme Chemistry Past Questions and Answers

Question 86:

What is the formula of sodium gallate if gallium (Ga) shows an oxidation number of \(+3\) ?

A. \(\mathrm{NaGaO}_{3}\)
B. \(\mathrm{Na}_{2} \mathrm{Ga}(\mathrm{OH})_{2}\)
C. \(\mathrm{NaGa}(\mathrm{OH})_{3}\)
D. \(\mathrm{NaGa}(\mathrm{OH})_{4}\)

Question 87:

The mass of Ag deposited when a current of \(10 \mathrm{~A}\) is passed through a solution of silver salt for 4830 secs is \([\mathrm{Ag}=108,1 \mathrm{~F}=\) \(96500 \mathrm{C}]\)

A. \(54.0 \mathrm{~g}\)
B. \(27.0 \mathrm{~g}\)
C. \(13.5 \mathrm{~g}\)
D. \(108.0 \mathrm{~g}\)

Question 88:

The solubility of alkanols in water is due to ____________

A. Their covalent nature
B. Hydrogen bond
C. Their low boiling point
D. Their ionic character

Question 89:

If a reaction is exothermic and there is a great disorder, it means ____________

A. The reaction is in a state of equilibrium
B. There will be a large increase in free energy
C. There will be a large decrease in free energy
D. The reaction is static

Question 90:

In what way is the equilibrium constant for the forward reaction related to that of the reverse reaction?

A. The two equilibrium constants are identical
B. The product of the two is expected to be one
C. The product of the two is always greater than one
D. The addition of the two is expected to be one