Chemistry 1993 Jamb Past Questions and Answers

Question 11 :

• JAMB 1993

Argon is used in gas-filled electric lamp because it helps to?

A. Prevent the reduction of the lamp fillaments
B. Prevent oxidation of the lamp fillaments
C. Make the lamp fillament glow brightly
D. Keep the atmosphere in the lamp inert

Question 12 :

• JAMB 1993

The air around a petroleum refinery is most likely to contain?

A. CO₂, SO₃ and N₂O
B. CO₂, CO and N₂O
C. SO₂, CO and NO₂
D. PH₃ H₂O and CO₂

Question 13 :

• JAMB 1993

Water can be identified by the use of?

A. Anhydrous copper (II) tetraoxosulphate (VI)
B. Anhydrous sodium trioxocarbonate (IV)
C. Potassium heptaoxochromate (VII)
D. Copper (II) trioxocaronate (IV)

Question 14 :

• JAMB 1993

The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as?

A. Deliquescene
B. Hygroscopy
C. Effervescence
D. Efflorescence

Question 15 :

• JAMB 1993

A student prepares 0.5 M solution each of hydrochloric and ethanoic acids and then measured pH. The result would show that the?

A. PH values are equal
B. HCI solution has a higher pH
C. Sum of the values is 14
D. Ethanoic acid solution has a higher pH