Jamb Chemistry Past Questions and Answers

Question 1626:

• JAMB 2011

The impurities formed during the laboratory preparation of chlorine gas are removed by

A. H₂O
B. NH₃
C. H₂SO₄
D. HCl

Question 1627:

• JAMB 2011

The effect of the presence of impurities such as carbon and sulphur on iron is that they

A. Give it high tensile strenght
B. Make it malleable and ductile
C. Increase its melting point
D. Lower its melting point

Question 1628:

• JAMB 2011

A few drops of concentrated HNO\(_3\) is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be

A. Pb²⁺
B. Cu²⁺
C. Fe³⁺
D. Fe²⁺

Question 1629:

• JAMB 2011

The bleaching action of chlorine gas is effective due to the presence of

A. Hydrogen chloride
B. Water
C. Air
D. Oxygen

Question 1630:

• JAMB 2011

In the laboratory preparation of oxygen, dried oxygen is usually collected over

A. Hydrochloric acid
B. Mercury
C. Calcium chloride
D. Tetraoxosulphate (VI) acid