Water - Jamb Chemistry Past Questions and Answers

Question 61:

• JAMB 2008

Air boiled out of water as steam is richer in

A. Nitrogen and oxygen
B. Carbon (IV) oxide and oxygen
C. Noble gases and carbon (IV) oxide
D. Oxygen and noble gases

Question 62:

• JAMB 2008

In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove

A. Large particles
B. Germs
C. Fine particles
D. Odour

Question 63:

• JAMB 2008

When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to

A. White
B. Pink
C. Red
D. Blue

Question 64:

• JAMB 2009

The percentage of water of crystallization in ZnSO₄.7H₂O is
[Zn = 65, S = 32, O = 1, H = 1]

A. 33%
B. 44%
C. 55%
D. 87%

Question 65:

• JAMB 2009

When sodium trioxocarbonate (IV) decahydrate loses its water of crystallization to the atmosphere, the process is

A. Deliquescence
B. Efflorescence
C. Hygroscopic
D. Effervesecence