Jamb Chemistry 2020 Past Questions and Answers

Question 11:

• JAMB 2020

When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?

A. Oxyethene
B. Oxyhydrocarbon flame
C. Oxyacetylene flame
D. Oxymethane flame

Question 12:

• JAMB 2020

Which of the following substances is a mixture?

A. Granulated sugar
B. Seawater
C. Sodium chloride
D. Iron filling

Question 13:

• JAMB 2020

If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?

A. 1.650atm
B. 0.825atm
C. 0.413atm
D. 0.275atm

Question 14:

• JAMB 2020

Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?

A. P
B. Q
C. R
D. S

Question 15:

• JAMB 2020

The products of the thermal decomposition of ammonium trioxonitrate(v) are?

A. Nitrogen (I) Oxide and Water
B. Ammonia and Oxide
C. Nitrogen and Water
D. Nitrogen (IV) Oxide and Water