Chemical combination - Jamb Chemistry Past Questions and Answers

Question 46:

• JAMB 1989

A solution of calcium bromide contains 20 g dm ³ What is the molarity of the solution with respect to calcium bromide and bromide ions? [Ca = 40, Br = 80]

A. 0. 1, 0 . 1
B. 0. 1, 0. 2
C. 0. 1, 0. 05
D. 0.05, 0.1

Question 47:

• JAMB 1989

If in the graph above 1 dm ³ of a saturated solution of KCL is cooled from 80^oC, the mass of crystals deposited will be
[K = 39, Cl = 35.5]

A. 7.45 g
B. 14.90 g
C. 74.50 g
D. 149.00 g

Question 48:

• JAMB 1990

If a gas occupies a container of volume 146 cm³ at 18°C and 0.97`atm, its volume 146cm³ at s.t.p is?

A. 133
B. 146
C. 266
D. 292

Question 49:

• JAMB 1990

The volume occupies by 1.58g of a gas at s.t.p is 500cm³. What is the relative molecular mass of the gas?
(G.M.V at s.t.p = 22.40dm³)

A. 28
B. 32
C. 44
D. 71

Question 50:

• JAMB 1990

What is the concentration of H⁺ ions in moles per dm³ of a sodium of pH 4.398?

A. 4.0 χ 10^-5
B. 0.4 χ 10^-5
C. 4.0 χ 10^-3
D. 0.4 χ 10^-3