Jamb Chemistry 2018 Past Questions and Answers

Question 76:

• JAMB 2018

Which of these alloys contains copper?

A. Solder
B. Steel
C. Permallory
D. Bronze

Question 77:

• JAMB 2018

If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.

A. 196
B. 49
C. 106
D. 82

Question 78:

• JAMB 2018

Sieving is a technique used to separate mixtures containing solid particles of

A. Small sizes
B. Large sizes
C. Different sizes
D. The same size

Question 79:

• JAMB 2018

3H\(_{2(g)}\)+ N2 ⇔ 2NH\(_{3(g)}\) ; H= -ve
In the reaction above, lowering of temperature will

A. Have no effect on the equilibrium position
B. Increase the rate of both the forward and reverse reactions equally
C. Favour the forward reaction
D. Favour the reverse reaction

Question 80:

• JAMB 2018

The situation obtained when a perfect gas expands into a vacuum is

A. ΔH is positive and TΔ S is zero
B. ΔH is positive and T Δ S is negative
C. ΔH is negative and TΔ S is zero
D. ΔH is zero and T Δ S is positive