Solubility - Jamb Chemistry Past Questions and Answers

Question 16:

• JAMB 1982

How many grams of methylacetylene (propyne) CH₃ – C Ξ CH will completely discharge the colour of 8g of bromine?
(Br = 80, C = 12, H = 1)

A. 0.5
B. 1.0
C. 2.0
D. 3.0
E. 4.0

Question 17:

• JAMB 1982

The solubility curve of a solid X (molecular mass = 160) is as show above. 1,000 cm3 of a saturated solution of X at 80°C is cooled to 40°C . The weight of X crystalized out would be

A. 10 g
B. 12 g
C. 14 g
D. 16 g
E. 18 g

Question 18:

• JAMB 1983

X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is

A. Na ₂CO ₃
B. NaHCO ₃
C. NaHSO ₄
D. Na ₂SO ₄

Question 19:

• JAMB 1983

X is a crystalline salt of sodium solution of X in water turns litmus red and produces a gas which turns lime water milky when added to sodium carbonate. With barium chloride solution, X gives hydrochloric acid. X is

A. Na ₂CO ₃
B. NaHCO ₃
C. NaHSO ₄
D. Na ₂SO ₄

Question 20:

• JAMB 1983

A mixture of common salt, ammonium chloride and barium sulphate can best be separated by

A. Addition of water followed by filtration then sublimation
B. Addition of water followed by sublimation then filtration
C. Sublimation followed by addition of water then filtration
D. Fractional distillation
E. Fractional crystallization