Post Utme Chemistry Past Questions and Answers

Question 641:

\begin{array}{|l|l|}
\hline Body Fluid & pH value \\
\hline Gastric juice & \(1.6-1.8\) \\
\hline Bile & \(7.8-8.6\) \\
\hline Urine & \(5.5-7.0\) \\
\hline
\end{array}
Use the date above to arrange the body fluids mentioned in order of increasing acidity. (A) Bile < gastric juice \(<\) urine (B) Gastric juice \(<\) urine \(<\) Bile
Use the date above to arrange the body fluids mentioned in order of increasing acidity.

A. Bile < gastric juice< urine
B. Gastric juice < urine < Bile
C. Bile < urine < Gastric juice
D. Urine < bile < gastric juice

Question 642:

When sodlum trloxocarbonate (iv) decahydrate loses its water of crystallization to the atmosphere, the process is ____________

A. Deliquescence
B. Efflorescence
C. Hygroscopic
D. Effervescence

Question 643:

Water can be obtained as the only product during the ____________

A. Combustion of hydrocarbons
B. Neutralization of an acid by a base
C. Combustion of hydrogen
D. Electrolysis of brine

Question 644:

If \(10.5 \mathrm{~g}\) of lead (ii) trioxonitrate (v) is dissolved in \(20 \mathrm{~cm}^{3}\) of distilled water at \(18^{\circ} \mathrm{C}\), the solubility of the solute in \(\mathrm{mol}\) \(\mathrm{dm}^{-3}\) is ____________

\([\mathrm{Pb}=207, \mathrm{~N}=14, \mathrm{O}=16]\)

A. \(1.60\)
B. \(5.25\)
C. \(16.00\)
D. \(525.00\)

Question 645:

For a given solute, the concentration of Its saturated solution in different solvents are ____________

A. The same at the same temperature
B. Different at the same temperature
C. The same at different temperature
D. Constant