Jamb Chemistry Past Questions and Answers

Question 1561:

• JAMB 2010

Permanent hardness of water can be removed by

A. Filtration
B. Adding slaked lime
C. Adding caustic soda
D. Boiling

Question 1562:

• JAMB 2010

Substance employed as drying agents are usually

A. Amphoteric
B. Hygroscopic
C. Efflorescent
D. Acidic

Question 1563:

• JAMB 2010

Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120oC.
[Cu = 64, S = 32, O = 16]

A. 4.00
B. 2.50
C. 0.40
D. 0.25

Question 1564:

• JAMB 2010

Coffee stains can best be removed by

A. Kerosine
B. Turpentine
C. A solution of borax in water
D. Ammonia solution

Question 1565:

• JAMB 2010

Carbon (II) oxide is considered dangerous if inhaled mainly because it

A. Can cause injury to the nervous system
B. Competes with oxygen in the blood
C. Competes with carbon (IV) oxide in the blood
D. Can cause lung cancer