Separation Processes: Evaporation, Simple And Fractional Distillation, Sublimation, Filtration, Crystallization, Paper And Column Chromatography, Simple And Fractional Crystallization, Magnetization, Decantation Jamb Chemistry Past Questions
Question 1
A small quantity of solid ammonium chloride (NH4Cl) heated gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo
- A. distillation
- B. sublimation
- C. precipitation
- D. evaporation
Question 2
The principle of column chromatography is based on the ability of the constituents to
- A. move at different speeds in the column
- B. dissolve in each other in the column
- C. react with the solvent in the column
- D. react with each other in the column
Question 3
0.499g 0f CuSO4.xH2O when heated to constant weight gave a residue of 0.346g. the value of x is? (Cu = 63.5, S = 32.0, O = 16, H = 1)
- A. 0.5
- B. 2.0
- C. 3.0
- D. 4.0
- E. 5.0
Question 4
3.0g of a mixture of potassium carbonate and potassium chloride were dissolved in a 25cm3 of this solution required required 40.00cm3 of 0.1M HCl for neutralization. What is the percentage by weight of K2CO3 in the mixture. (K = 39, O = 16, C = 12)
- A. 60
- B. 72
- C. 82
- D. 89
- E. 92
Question 5
Ammonium chloride can be separated from its mixture with common salt by
- A. Distillation
- B. Evaporation
- C. Decantation
- D. Sublimation
