Jamb Chemistry 1993 Past Questions and Answers

Question 31:

• JAMB 1993

The active reducing agent in the blast furnace for the extraction of iron is?

A. Carbon
B. Limestone
C. Carbon(II)oxide
D. Calcium oxide

Question 32:

• JAMB 1993

The fraction of crude oil used as jet fuel is?

A. Refinery gas
B. Diesel oil
C. Kerosene
D. Gasoline

Question 33:

• JAMB 1993

It is not desirable to use lead tetraethyl as an anti-knock agent because?

A. It is expensive
B. Of pollution effects from the exhaust fumes
C. It lowers the octane rating of petrol
D. It is explosive

Question 34:

• JAMB 1993

Al₂O_3(s) + 3H₂SO_4(aq) → Al₂(SO_4(aq)) + 3H_2(I)O
Al₂O_3(s) + 2NaOH_(aq)) + 3H_2(I)O → 2NaAl(OH)_4(aq)).
We can conclude from the equations above that Al₂O_3(s) is?

A. An acidic oxide
B. An amphoteric oxide
C. A basic oxide
D. A neutral oxide

Question 35:

• JAMB 1993

The carbon atoms on ethane are?

A. Sp² hybridized
B. Sp³ hybridized
C. Sp²d hybridized
D. Sp hybridized