Water - Jamb Chemistry Past Questions and Answers

Question 91:

• JAMB 2018

In the removal of water hardness, permutit is regenerated with a strong solution of

A. NaOH
B. Na\(_3\)SO\(_4\)
C. Na\(_3\)CO\(_3\)
D. NaCl

Question 92:

• JAMB 2019

When chlorine water is exposed to bright sunlight, the following products are formed

A. HCl\(_{(aq)}\) and Cl\(_2\)
B. HOCl\(_{(aq)}\) and Cl\(_2\)
C. HCl\(_{(aq)}\) and O\(_2\)
D. HOCl\(_{(aq)}\) and O\(_2\)

Question 93:

• JAMB 2019

The two ions responsible for hardness in water are

A. Ca\(^{2+}\) and / or Mg\(^{2+}\)
B. K\(^+\) and / or Mg\(^{2+}\)
C. Ca\(^{2+}\) and / or Li\(^+\)
D. Ca\(^{2+}\) and / or Na\(^+\)

Question 94:

• JAMB 2021

Soaps clean surfaces on the principle based on?

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

Question 95:

• JAMB 2021

Which of the following is a non-metal that remains liquid at room temperature?

A. Chlorine
B. Phosphorus
C. Bromine
D. Helium