Jamb Chemistry Past Questions and Answers

Question 1761:

• JAMB 2014

H ₂O _(g) + C _(s) → H_2(g) + CO_(g)
The oxidizing agent in the reaction above is

A. CO_(g)
B. C_(s)
C. H₂O_(g)
D. H_(2)(g)

Question 1762:

• JAMB 2014

Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound
[Cu=64, F = 96500 Cmol^-1]

A. 32395.5
B. 30156.3
C. 60784.5
D. 15196.5

Question 1763:

• JAMB 2014

How many faraday of electricity is required to produce 0.25 mole of copper?

A. 1.00F
B. 0.01F
C. 0.05F
D. 0.50F

Question 1764:

• JAMB 2014

If the change in free energy of a system is -899 Jmol^-1 and the entropy change is 10Jmol^-1k^-1 at 250C, calculate the enthalpy change.

A. +2081 Jmol^-1
B. -2081 Jmol^-1
C. -649 Jmol^-1
D. +649 Jmol^-1

Question 1765:

• JAMB 2014

In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?

A. Equilibrium constant is very large
B. ∆H - T∆S = O
C. ∆ H > T ∆ S
D. Equilibrium constant is less than zero