Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 116:

• JAMB 2005

The gas that is the most dangerous pollutant to human is

A. Sulphur (IV) oxide
B. Carbon (IV) oxide
C. Nitrogen (II) oxide
D. Hydrogen sulphide

Question 117:

• JAMB 2005

Sugar is separated from its impurities by

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

Question 118:

• JAMB 2005

In a flame test for calcium, the flame appears

A. Green when viewed through a blue glass
B. Blue when viewed through a blue glass
C. Orange -red when viewed through a blue glass
D. Brick-red when viewed through a blue-glass

Question 119:

• JAMB 2006

The raw materials used for the smelting of iron ore in a furnace is

A. CaSO₄
B. CaCO₃
C. CuSO₄
D. Zn(NO₃)₂

Question 120:

• JAMB 2006

An emulsion may be produced by shaking a detergent solution with

A. Palm wine
B. Ethanoic acid
C. Palm oil
D. Water