Jamb Chemistry 2014 Past Questions and Answers

Question 21:

• JAMB 2014

Which of the following salts will turn blue litmus red?

A. Sodium tetrahydroxozincate (ll)
B. Potassium hydrogentetraoxosulphate (lV)
C. Sodium trioxocarbonate (lV)
D. Zinc chloride hydroxide

Question 22:

• JAMB 2014

Zn _(s) + CuSO ₄(aq) → ZnSO ₄(aq) + Cu _(s)
In the reaction above, the oxidation number of the reducing agent changes from

A. 0 to + 4
B. 0 to + 2
C. + 1 to + 2
D. + 1 to + 3

Question 23:

• 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 24:

• 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 25:

• 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