Post Utme Chemistry Past Questions and Answers

Question 726:

Mixing of aqueous solution of barium hydroxide and sodium tetraoxocarbonate (IV) yields a white precipitate of ____________

A. Barium oxide
B. Sodium tetraoxocarbonate
C. Sodium oxide
D. Sodium hydroxide
E. Barium tetraoxocarbonate

Question 727:

An organic compound decolorized acidified \(\mathrm{KMnO}_{4}\) solution but failed to react with ammonium silver nitrate solution. The organic compound is likely to be ____________

A. Carboxylic acid
B. An alkane
C. An alkene
D. An alkyne
E. An alkenone

Question 728:

Which of the following conducts electricity?

A. Sulphur
B. Graphite
C. Diamond
D. Red phosphorus
E. Yellow phosphorous

Question 729:

Which of the following compounds is NOT the correct product formed when the parent metal is heated in air?

A. Calcium oxide(CaO)
B. Sodium oxide( \(\left.\mathrm{Na}_{2} \mathrm{O} \right)\)
C. Tri-iron tetroxide( \(\left.\mathrm{Fe}_{3} \mathrm{O} \right)\)
D. Aluminium oxide \(\left(\mathrm{Al}_{2} \mathrm{O}_{3} \right)\)

Question 730:

When marble is heated to \(1473 \mathrm{~K}\), another whiter solid is obtained which reacts vigorously with water to give an alkaline solution. The solution contains ____________

A. \(\mathrm{NaOH}\)
B. \(\mathrm{KOH}\)
C. \(\mathrm{Mg}(\mathrm{OH})_{2}\)
D. \(\mathrm{Zn}\left(\mathrm{OH}_{2} \right\)
E. \(\mathrm{Ca}(\mathrm{OH})_{2}\)