Question 121:

• JAMB 1979

Which of the following contains two amphoteric oxides?

A. Sodium oxide, Zinc oxide , Magnesium oxide
B. Aluminium oxide, Calcium oxide, Zinc oxide
C. Potassium oxide, Lithium oxide, Carbon monoxide
D. Silver oxide, Lead oxide, Sodium oxide
E. Sulphur dioxide, Aluminium oxide, Carbon monoxide

Question 122:

• JAMB 1979

Helium atoms are chemically unreactive because

A. There are no electrons around the nucleus
B. The number of protons equals the number of electrons
C. There are equal number of protons and neutrons in the nucleus
D. The outer electron shell is completely filled
E. The atoms contain only protons

Question 123:

• JAMB 1979

\(50cm^{3}\) of hydrogen are sparked with \(20cm^{3}\) of oxygen at \(100°C\) and \(1atm\) . The total volume of the residual gases in

A. 50 cm³
B. 10 cm³
C. 40 cm³
D. 30 cm³
E. 70 cm³

Question 124:

• JAMB 1979

How many grams of HBr would exactly be required to react with 2 g of propyne? (C =12, H=1, Br = 80)

A. 4. 1 g
B. 6. 1 g
C. 8. 1g
D. 16.2g

Question 125:

• JAMB 1979

When ammonium, potassium and calcium carbonates are each separately heated

A. None of them will decompose
B. Each of them will decompose to give carbondioxide and the respective oxide
C. Ammonium carbonate and potassium carbonate will not decompose
D. Only ammonium carbonate and the respective oxide
E. Ammonium carbonate will decompose to give carbondioxide, water and ammonia