Post Utme Chemistry Past Questions and Answers

Question 516:

A compound contains 31.91% potassium, 23.93% chlorine and the rest oxygen.
What is the chemical formula of the compound?
(k=39, Cl =35.5, O=16).

A. KCIO⁴
B. KCIO⁴
C. KCIO²
D. KClO²

Question 517:

The chromatographic separation of ink is based on the ability of the component to ____________

A. React with the solvent
B. React with each other
C. Dissolve each other in the column
D. Move at different speed in the column

Question 518:

Which of the following gases contains the least number of atoms at S.T.P?

A. 1 mole of butane
B. 3 moles of ozone
C. 4 Moles of Chorine
D. 7 moles of argon

Question 519:

What amount of mercury would be liberated if the same quantity of electricity that liberate 0.65g of zinc is applied?
(Zn = 65, Hg =201)

A. 2.01g
B. 1.00g
C. 4.02g
D. 8.04g

Question 520:

When dissolved in water NAOH flakes shows ____________

A. An endothermic change
B. An exothermic change
C. A slow reaction
D. A rapid reaction