Post Utme Chemistry Past Questions and Answers

Question 661:

Which of the following ions is acidic?

A. \(1 \mathrm{C}\)
B. \(\mathrm{NO}_{3}\)
C. \(\mathrm{S}_{2}\)
D. \(\mathrm{HgO}^{+}\)

Question 662:

The structural component that makes detergent dissolve more water than soap is ____________

A. \(-\mathrm{SO}_{3} \mathrm{Na}^{+}\)
B. \(-\mathrm{COON}\)
C. \(-\mathrm{SO}^{4} \cdot \mathrm{Na}^{+}\)
D. \(-\mathrm{COOK}^{+}\)

Question 663:

A liquid that will dissolve fat is ____________

A. Hydrochloric acid
B. Calcium hydroxide
C. Kerosene
D. Water

Question 664:

What a mass \(\mathrm{K}_{2} \mathrm{CrO}_{4}\) is required to prepare \(250 \mathrm{~cm}^{3}\) of \(0.020 \mathrm{moldm}^{-3}\) solution?

\(\left(\mathrm{K} . \mathrm{CrO}_{\mathrm{i}}-194.29 \mathrm{moldm} \right.\) )

A. \(0.979\)
B. \(9.709\)
C. \(19.42 \mathrm{~g}\)
D. \(97.109\)

Question 665:

\(\mathrm{X}\) is crystalline salt of sodium. Solution of \(\mathrm{X}\) in water turns litmus red produces a gas which turns time water milky when added to sodium carbonate. With barium chloride solution, X glves a which precipltate which is insoluble in dilute hydrochloric acid. \(X\) is ____________

A. \(\mathrm{Na}_{2} \mathrm{CO}_{3}\)
B. \(\mathrm{NaHCO}_{3}\)
C. \(\mathrm{NaHSO}_{4}\)
D. \(\mathrm{Na}_{2} \mathrm{O}_{3}\)
E. \(\mathrm{Na}_{2} \mathrm{SO}_{4}\)