Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 26:

• JAMB 1981

What happens when the nitrates of potassium, calcium, zinc and copper are separately heated?

A. All the nitrate will decompose to their respective metals
B. The nitrates of calcium and potassium will decomposes to their nitrites
C. Only copper nitrate decomposes to the metal
D. Only the nitrates of zinc and copper will decompose to their oxides
E. The nitrates of calcium, zinc and copper decompose to their oxides

Question 27:

• JAMB 1982

Which of the following statements is incorrect?

A. Calcium reacts with water to form calcium
B. Magnesium reacts very slowly with water but faster with warm water
C. Iron will not react with water in the absence of air
D. Sodium reacts with water
E. Copper reacts with steam

Question 28:

• JAMB 1982

In the reaction N₂(g) + O(g)
↔ 2NO(g) produced i an increase in the total pressure will?

A. Cause less nitrogen to be produced in the equilibrium mixture
B. Cause less nitric oxide to be produced in the equilibrium mixture
C. Cause more nitric oxide to be produced in the equilibrium mixture
D. Cause more oxygen to be produced in the equilibrium mixture
E. Have no effect

Question 29:

• JAMB 1982

When a little brine was added to a metal nitrate a white precipitate was formed which first turned violet and then black on exposure to ai. The metal nitrate is therefore?

A. Sodium nitrate
B. Mercuric nitrate
C. Lithium nitrate
D. Silver nitrate
E. Potassium nitrate

Question 30:

• JAMB 1982

Brass is an alloy containing copper and?

A. Zinc
B. Tin
C. Aluminium
D. Silver
E. Lead