Jamb Chemistry 1981 Past Questions and Answers

Question 16:

• JAMB 1981

The brown coloration in nitric acid prepared in the laboratory can be removed by?

A. Heating the acid
B. Bubbling air through the acid
C. Cooling the acid
D. Adding a decolorizing agent
E. Adding a base

Question 17:

• JAMB 1981

Which of the following processes takes place during electrolysis?

A. Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral
B. Negative ions are dicharged at the anode by gaining suficient electrons to become neutral
C. Positive ions are discharged at the anode by losing sufficient electrons to become neutral
D. Negative ions are discharge at the anode by losing sufficient electrons to become neutral
E. Nothing happens

Question 18:

• JAMB 1981

In the preparation of ammonia, which of the following is used as the drying agent?

A. CaO
B. CaCI₂
C. Conc. H₂SO₄
D. P₂O₅
E. H₃PO₄

Question 19:

• JAMB 1981

Which of the following can have an isomer?

A. C₂H₄
B. C₄H₁₀
C. C₃H₈
D. C₂H₆
E. C₆H₆

Question 20:

• JAMB 1981

Allotropes are elements having?

A. Different physical but the same chemical properties
B. Different chemical but the same physical properties
C. The same chemical and physical properties
D. Different atomic structure
E. The same position in the periodic table