Water of crystallization - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1989

A hydrated salt of formula MSO₄.xH₂ O CONTAINS 45.3% by mass of water of crystalisation. Calculate the value of x [M = 56, S = 32, O = 16, H = 1 ]

A. 3
B. 5
C. 7
D. 10

Question 7:

• JAMB 1993

The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as?

A. Deliquescene
B. Hygroscopy
C. Effervescence
D. Efflorescence

Question 8:

• JAMB 2002

When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be

A. Efflorescence
B. Deliquescence
C. Effervescence
D. Fluorescence

Question 9:

• 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 10:

• 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