Question 291:

• JAMB 1982

In the preparation of carbon monoxide by heating ethanedioic acid with concentrated sulphuric acid, the concentrated sulphuric acid act as?

A. An oxidizing agent
B. A reducing agent
C. A dehydrating agent
D. A reaction medium
E. A catalyst

Question 292:

• JAMB 1982

When copper powder is heated with concentrated sulphuric acid, the gas produced is?

A. Hydrogen sulphide
B. Sulphur dioxide
C. Sulphur trioxide
D. Hydrogen pentasulphide
E. Sulphur pentoxide

Question 293:

• JAMB 1982

Magnesium ribbon was added to each of the following aqueous solution in turn: H₂SO₄, AgNO₃, HNO₃, HCl, NH₃, HCl, NH₃. In which case does the magnesium become covered with a dark precipitate?

A. H₂SO₄
B. AgNO₃
C. HNO₃
D. NH₃
E. HCl

Question 294:

• JAMB 1982

How many grams of methylacetylene (propyne) CH₃ – C Ξ CH will completely discharge the colour of 8g of bromine?
(Br = 80, C = 12, H = 1)

A. 0.5
B. 1.0
C. 2.0
D. 3.0
E. 4.0

Question 295:

• JAMB 1982

What weight of sodium hydroxide is required to make 500 cm³ of 0.2 M solution?
(Na = 23, O = 16, H = 1)

A. 40 g
B. 20 g
C. 10 g
D. 4 g
E. 2 g