Waec Chemistry Past Questions For Year 2014
Question 16
A gaseous mixture contains 0,256 g of hydrogen and 2.00 g of oxygen. The mole ration of hydrogen to oxygen in the mixture is (H=1.00; O=16,0)
- A. 1:1
- B. 2:1
- C. 1:4
- D. 8:1
Question 17
An aqueous solution of Na2CO3 is
- A. acidic
- B. alkaline
- C. amphoteric
- D. neutral
Question 18
The type of energy changes that accompany the mixing of a strong acid to a strong base is
- A. electrical
- B. heat
- C. light
- D. sound
Question 19
Which of the following statements about volatile liquids is correct? They have
- A. high vapour pressure and low boiling point
- B. high vapour pressure and high boling point
- C. low vapour pressure and low boining point
- D. low vapour pressure and high boiling point
Question 20
The vapour pressure of a given volume of liquid increase when the
- A. liquid becomes saturated with a salt
- B. Volume of the liquid increases
- C. temperature of the liquid falls
- D. temperature of the Liquid rises
