Waec Chemistry Past Questions
Question 1431
Which of the following gases is alkaline?
- A. NO\(_{2}\)
- B. CO\(_{2}\)
- C. NH\(_{3}\)
- D. N\(_{2}\)O
Question 1432
What is the percentage composition of carbon
in Ca(HCO3)\(_{2}\) ?
[ Ca = 40.0, 0= 16.0, C = 12.0, H= 1.0]
- A. 22.2%
- B. 14.8%
- C. 7.4%
- D. 3.7%
Question 1433
Which of the following elements would displace copper from a solution of copper ions?
- A. silver
- B. gold
- C. lead
- D. mercury
Question 1434
If 50 cm\(^{3}\) of a saturated solution of KNO\(_{3}\) at 40 °C contained 5:05 g of the salt, its solubility at the same temperature would be
[KNO\(_{3}\) = 101]
- A. 1.5 mol dm\(^{-3}\)
- B. 1.5 mol dm\(^{-3}\)
- C. 2.0 mol dm\(^{-3}\)
- D. 5.0 mol dm\(^{-3}\)
Question 1435
What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm\(^{3}\) cylinder?
[R=0.082 atm dm\(^{-3}\) mol\(^{-1}\) K\(^{-1}\)]
- A. 0.32
- B. 1.52
- C. 3.13
- D. 31.25
