Chemistry Past Questions and Answers

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:

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:

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:

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:

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