Jamb Chemistry 2017 Past Questions and Answers

Question 26:

• JAMB 2017

Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol^-1]

A. 0.05
B. 10.80
C. 10.00
D. 0.10

Question 27:

• JAMB 2017

The reaction of halogens with alkanes in the presence of sunlight is an example of

A. Oxidation reaction
B. Addition reaction
C. Hydrogenation reaction
D. Substitution reaction

Question 28:

• JAMB 2017

The enzyme used in the hydrolysis of starch to dextrin and maltose is

A. Amylase
B. Diastatse
C. Invertase
D. Zymase

Question 29:

• JAMB 2017

The alkyl group is represented by the general formula

A. C_nH₂n
B. C_nH₂n − 2
C. C_nH₂n + 1
D. C_nH₂n + 2

Question 30:

• JAMB 2017

Cu2S(g) + O2(g) → 2Cu + SO2(g)
What is the change in the oxidation number of copper in the reaction?

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