Jamb Chemistry Past Questions and Answers

Question 1851:

• JAMB 2015

Chlorine gas turns damp starch-iodide paper

A. Pink
B. Colourless
C. Red
D. Dark blue

Question 1852:

• JAMB 2015

Chlorine consisting of two isotope of mass number 35 and 37 in the ratio 3:1 has an atomic mass of 35.5. Calculate the relative abundance of the isotope of mass number 37

A. 20
B. 25
C. 60
D. 75

Question 1853:

• JAMB 2015

The principal constituent of natural gas is

A. Methane
B. Ethane
C. Propane
D. Butane

Question 1854:

• JAMB 2015

One mole of a hydrocarbon 36g of carbon and its density is 20. The structure of hydrocarbon is (organic chemical)

A. CH\(_2\)C = CH\(_2\)
B. CH\(_3\)CH = CH\(_2\)
C. CH\(_3\)CH\(_2\)C = CH
D. CH\(_3\)CH\(_2\)CH\(_3\)

Question 1855:

• JAMB 2015

In the electrolysis of CuSo_4(g) using platinum electrode the reaction at the anode is

A. 4H+ 4e - 2H₂
B. 4OH^-- 4e = 2H₂O + O₂
C. 2OH - 2e_- = 2OH
D. 2OH^- + 2OH = 2H₂O + O₂