Jamb Chemistry 2020 Past Questions and Answers

Question 21:

• 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 22:

• 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 23:

• JAMB 2020

Deliquescent substances are also?

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

Question 24:

• 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 25:

• JAMB 2020

32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm\(^3\) of water generated 13.0kj of heat. The heat solution is?

A. 26.0kj/mol
B. 65.0kj/mol
C. 130.0kj/mol
D. 260.0kj/mol