Jamb Chemistry Past Questions and Answers

Question 166:

• JAMB 1980

On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 1¹/₂ litres of an oxide, What is the formula of the oxide.

A. XO₃
B. X₂O₃
C. X₃O₂
D. XO₂
E. None of the above

Question 167:

• JAMB 1980

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?

A. 2.2 M
B. 1.1 M
C. O.22 M
D. 0. 11 M
E. 0.20 M

Question 168:

• JAMB 1980

Which of the following reactions is correct as as written?

A. FeCl₂ + 3NH₄OH → Fe(OH)₃ + 3NH₄Cl
B. Pb₂O₃ + 4HCl → PbCl₂ + 2H₂O
C. PbNO₃ + H₂S → PbS + 2HNO₃
D. NaOH + H₂SO₄ → NaHSO₄ +H₂O
E. 2NH₄NO₃ → N₂ + 2H₂O

Question 169:

• JAMB 1980

Under high pressure, real gases do not obey gas laws because their molecules?

A. Have become more energetic
B. Have become less energetic
C. Have become smaller in size
D. Decompose into atoms
E. Start repelling each other

Question 170:

• JAMB 1980

How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm³ of 6M HCl?
(Mg=24, H=1, Cl=35.5)

A. 1.2 g
B. 0.7 g
C. 0.5 g
D. 0.3 g
E. 0.12 g