Jamb Chemistry 2017 Past Questions and Answers

Question 41:

• JAMB 2017

In the laboratory preparation of trioxonitrate (V) acid the nitrogen(iv) oxide formed as a by-product is removed by

A. Further heating
B. Adding concentrated H₂SO₄
C. Cooling the acid solution with cold water
D. Bubbling air through the acid solution

Question 42:

• JAMB 2017

A particle that contains 9 protons, 10 neutrons and 10 electrons is

A. Positive ion
B. Neutral atom of a metal
C. Neutral atom of a non-metal
D. Negative ion

Question 43:

• JAMB 2017

Ethene is prepared industrially by

A. Reforming
B. Polymerization
C. Distillation
D. Cracking

Question 44:

• JAMB 2017

Calculate the amount in moles of a gas which occupies 10.5 dm³ at 6 atm and 30^oC [R = 082 atm dm³ K^-1 mol^-1]

A. 2.536
B. 1.623
C. 4.736
D. 0.394

Question 45:

• JAMB 2017

If 100cm³ of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]

A. 10.0s
B. 12.5s
C. 17.7s
D. 32.0s