Separation of mixtures and purification of chemical substances - Jamb Chemistry Past Questions and Answers

Question 126:

• JAMB 2020

A few drop of conc HCL are added to about 10cm${}^3$ of a solution of PH 3.4. The PH of the resulting mixture is?

A. Less than 3.4
B. Greater than 3.4
C. Unaltered
D. The same as that of the pure water

Question 127:

• JAMB 2020

Chromatography is used to separate components of mixture which differ in their rates of ?

A. Diffusion
B. Migration
C. Reaction
D. Sedimentation

Question 128:

• JAMB 2020

Deliquescent substances are also?

A. Efflorescent
B. Anhydrous
C. Hygroscopic
D. Insoluble

Question 129:

• JAMB 2020

Helium is used in observation of ballons because it is?

A. Light and combustible
B. Light and non-combustible
C. Heavy and combustible
D. Heavy and non-combustible

Question 130:

• JAMB 2020

When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?

A. Sublimation
B. Crystallization
C. Distillation
D. Evaporation