Jamb Chemistry 1979 Past Questions and Answers

Question 26:

• JAMB 1979

An anhydride is

A. A compound wich has no water of crystallization
B. An oxide whose solution in water has a PH greater than 7
C. An oxide whose solution in water has a PH less than 7
D. An oxide that has hydrogen atoms
E. An amphoteric oxide

Question 27:

• JAMB 1979

In which of the following reactions is sulphur dioxide acting as an oxidizing agent?

A. SO ₂ + 2HNO₃ →H₂SO₄ + NO₂ + Heat
B. 2SO₂ + 2H₂O + O₂→ 2H₂SO₄
C. SO₂ + 2H₂O + CI₂→ H₂SO₄ + 2HCI
D. SO₂ + 2H₂S → 3S + 2H₂O
E. SO₂ + H₂O → H₂SO₃

Question 28:

• JAMB 1979

Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by

A. Dissolving it in water, recrystallizing it and then drying in the oven
B. Passing it through a concentrated aqueous solution of sodium hydroxide
C. Passing it through calcium oxide
D. Passing it through concentrated sulphuric acid
E. Passing it through anhydrous calcium choride

Question 29:

• JAMB 1979

Starch can be converted to ethyl alcohol by

A. Distillation
B. Fermentation
C. Isomerization
D. Cracking
E. Cooking

Question 30:

• JAMB 1979

The reaction between hydrogen and iodine may be represented by the equation H₂(g)+ I₂(g) → 2HI(g), and is exothermic. Therefore

A. An increase in temperature favours the forword reaction
B. An increase in pressure favours the backward reaction
C. Both pressure and temperature muct be increased to favour the forward reaction
D. A decrease in temperature will favour the forward reaction
E. A decrease in pressure and an increase in temperature will favour the forward reaction