Jamb Chemistry 2018 Past Questions and Answers

Question 51:

• JAMB 2018

The solubility of the solids that dissolves in a given solvent with the liberation of heat will

A. Increase with an increase in temperature
B. Decrease with an increase in temperature
C. Decrease with a decrease in temperature
D. Not be affected by changes in temperature

Question 52:

• JAMB 2018

What mass of Cu would be produced by the cathodic reduction of Cu\(^{2+}\) when 1.60A of current passes through a solution of CuSO\(_4\) for 1 hour. (F=96500Cmol\(^{-1}\) , Cu=64)

A. 7.64g
B. 3.82g
C. 1.91g
D. 0.96g

Question 53:

• JAMB 2018

Calculate the pH of 0.05 moldm\(^{-3}\) H\(_2\)SO\(_4\)

A. 1.30
B. 1.12
C. 1.00
D. 0.30

Question 54:

• JAMB 2018

The choice of method for extracting a metal from its ores depends on the

A. Strength of the core
B. Position of the metal in the electrochemical series
C. Source of the core
D. Position of the metal in the periodic table

Question 55:

• JAMB 2018

At what temperature is the solubility of potassium trioxonitrate(V ) equal to that of sodium trioxonitrate (V)?

A. 0\(^o\)c
B. 30\(^o\)c
C. 40\(^o\)c
D. 45\(^o\)c