Chemical combination - Jamb Chemistry Past Questions and Answers

Question 71:

• JAMB 1994

One mole of a hydrocarbon contains 48 g of carbon. If it vapour density is 28, the hydrocarbon is?

A. An alkane
B. An alkene
C. An alkyne
D. Aromatic (C = 12, H = 1)

Question 72:

• JAMB 1995

The number of hydrogen ions in 4.9 g of tetraoxosulphate (IV) acid is?
(S = 32, O =16, H = 1, Na = 6.02 x 10₂₃

A. 3.01 x 10₂₂
B. 6.02 x 10₂₂
C. 3.01 x 10₂₃
D. 6.01 x 10₂₃

Question 73:

• JAMB 1995

What volume of oxygen will remain after reacting 8cm³ of hydrogen with 20cm³ of oxygen?

A. 10 cm³
B. 12 cm³
C. 14 cm³
D. 16 cm³

Question 74:

• JAMB 1995

A gas sample with an initial volume of 3.25 dm³ is heated and allowed to expand to 9.75 dm³ at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?

A. 3:1
B. 5:2
C. 5:4
D. 8:3

Question 75:

• JAMB 1995

Two cylinders A and B each contains 30 cm³ of
oxygen and nitrogen respectively at the same temperature and pressure. If there are 5.0 moles of nitrogen, then the mass of oxygen is?

A. 3.2 g
B. 6.4 g
C. 80.0 g
D. 160.0 g