Post Utme Chemistry Past Questions and Answers

Question 166:

Which of the following statements is correct?

A. Chlorine bleaches by oxidation while sulphur( \(1 \mathrm{~V})\) oxide bleaches by reduction
B. Chlorine bleaches \(h\) reduction while sulphur( IV) oxide bleaches by oxidation
C. Both of them bleach by oxidation
D. Both of them bleach by reduction

Question 167:

The IUPAC name for is ____________
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A. 1-chlorobenzoic acid
B. 3-chlorobenzoic acid
C. M-chlorobenzoic acid
D. P-chlorobenzoic acid

Question 168:

3-methylbutan-2-one is an isomer of ____________

A. Pentanal
B. 3-methylpentan-2-one
C. Hex-3-.ene
D. 2-methylprop-1-ene

Question 169:

Crystallization is a better method of separation than precipitation because ____________

A. Precipitation tends to bring other solutes out of solution
B. Crystallization is applicable to all solids
C. Precipitation always involves salting-out
D. Crystallization can only be done at high temperatures

Question 170:

Which of the following is not a chemical change?

A. Burning of magnesium
B. Rusting of iron
C. Action of water on potassium
D. Dissolving powdered sulfur in carbon disulfide