Jamb Chemistry 2021 Past Questions and Answers

Question 21:

• JAMB 2021

Which of the following is a form of calcium carbonate?
I. limestone
II. marble
III. chalk
Iv. egg-shells

A. I only
B. I, II and IV
C. I and II only
D. I, II, III, and IV

Question 22:

• JAMB 2021

Soaps clean surfaces on the principle based on?

A. Viscosity
B. Floatation
C. Elasticity
D. Surface tension

Question 23:

• JAMB 2021

The reactivity of fluorine is due to?

A. Its high electro negativity
B. Small size of fluorine atom
C. Availability of D-orbitals
D. Strong f-f bond

Question 24:

• JAMB 2021

The mass number of a nucleus is?

A. Always less than its atomic number
B. The sum of the number of protons and neutrons present in the nucleus
C. Always more than the atomic weight
D. A fraction

Question 25:

• JAMB 2021

The mass of one Avogadro number of helium atoms is?

A. 1.00gram
B. 4.00gram
C. 8.00gram
D. 6.00gram