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Chemistry questions and answers

Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

601.

An acidic salt has

A.

double anions in its aqueous solution

B.

a single cation in its aqueous solution

C.

hydrogen ions in its aqueous solution

D.

hydrogen atoms in its aqueous solution

Correct answer is C

Acid salts are salts whose aqueous solutions are acidic in character, implying that their aqueous solutions possess hydrogen ions.

602.

What is the solubility of a salt if 0.4g of it is obtained on evaporating 200cm3 of its saturated solution to dryness?

A.

0.08gdm3

B.

2.00gdm3

C.

8.00gdm3

D.

80.00gdm3

Correct answer is B

1000cm3 = 1dm3

200cm3 = 0.2dm3

⇒ 0.2dm3 contains 0.4g

hence, solubility of the salt which is the amount of the salt dissolvable in 1dm3 is

0.4g0.2dm3=2.0gdm3

603.

The process of extraction of iron from its ore is

A.

decomposition

B.

oxidation

C.

reduction

D.

sublimation

Correct answer is C

The Iron is to to be gotten by the removal of oxygen from its ore, and this is called a reduction reaction.

604.

Which of the following equations represents a redox reaction?

A.

HNO3(aq)+NaOH(aq)NaNO3(aq)+H2O(l)

B.

AgNO3(aq)+KCl(aq)AgCl(s)+KNO3(aq)

C.

CaCO3(s)CaO(s)+CO2(g)

D.

2H2S(s)+SO2(g)2HO2+3S(g)

Correct answer is D

No explanation has been provided for this answer.

605.

Which of the following organic compounds can undergo both addition and substitution reactions?

A.

Pentane

B.

Benzene

C.

Propane

D.

Hexane

Correct answer is B

An example of benzene addition reaction is the formation of cyclohexane by a mix of benzene vapour and hydrogen passed over nickel catalyst; while chlorobenzene is formed by substitution reaction.