Waec Chemistry Past Questions For Year 2008
Question 26
When 100 cm3 of a saturated solution of KCIO3 at 40oC is evaporated, 14 g of the salt is recovered what is the solubility of KCIO3 at 40oC? [KCIO3 = 122.5]
- A. 11.42 mol dm-3
- B. 8.80 mol dm-3
- C. 1. 14 mol dm-3
- D. 0.88 mol dm-3
Question 27
Consider the reaction represented by the question below: KOH(aq) + HCI(aq) → KCI(aq) + H2O(l) What volume of 0.25 mol dm-3 KOH would be required to completely neutralize 40 cm3 of 0.10 mol dm -3 HCI?
- A. 40 cm3
- B. 32cm3
- C. 24cm3
- D. 16cm3
Question 28
Which of the following compounds would dissolved in water to give a solution whose pH is less than 7?
- A. AI(NO3)3
- B. KNO3
- C. N2O
- D. NH3
Question 29
Which of the following compounds would not give a precipitate with ammoniacal AgNO3 solution?
- A. CH3 C≡CCH3
- B. HC≡CH
- C. CH3C≡CH
- D. CH3CH2C≡CH
Question 30
A mixture of kerosene and diesel oil can be separated by
- A. crystallization
- B. distillation
- C. precipitation
- D. sublimation
