Chemical combination - Jamb Chemistry Past Questions and Answers

Question 96:

• JAMB 2001

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

A. 32
B. 20
C. 14
D. 12

Question 97:

• JAMB 2001

Use the graph above to answer this question.If the gas is cooled, at what temperature will it start to condense?

A. 125 ^oC
B. 150^oC
C. 175^oC
D. 250^oC

Question 98:

• JAMB 2002

A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]

A. KClO₄
B. KClO
C. KClO₂
D. KClO₃

Question 99:

• JAMB 2002

A fixed mass of gas has a volume of 92cm₃ at 3 ^oC. When will be its volume at 18 ^oC if the pressure remains constant

A. 15.3cm³
B. 87.3cm³
C. 552.0cm³
D. 97.0cm³

Question 100:

• JAMB 2003

What volume of oxygen is produced from the decomposition of 2 mole of KCIO₃ at s.t.p?
[Molar volume of a gas at s.t.p = 22.4 dm³]

A. 22.4 dm³
B. 33.6 dm³
C. 44.8 dm³
D. 67.2 dm³