Waec Chemistry Past Questions For Year 2002
Question 16
A hydrogen atom which has lost an electron contains
- A. one proton only
- B. one neutron only
- C. one proton and one neutron
- D. one proton, one electronic and one neutron
Question 17
Determine the mass of sulphur (IV) oxide obtained when 91.0g of oxygen reacts completely with sulphur according to the following equation: S(s) + O\(_2\)(g) → SO\(_2\)(g) [S = 32; O = 16]
- A. 123g
- B. 139g
- C. 155g
- D. 182g
Question 18
Calculate the mass of chlorine gas which occupies a volume of 1.12 dm\(^3\) a volume of 1.12 dm\(^3\) at s.t.p [Cl = 35.5, 1 mole og gas occupies 22.4 dm\(^3\) at s. t. p ]
- A. 1.80g
- B. 3.55g
- C. 7.10g
- D. 15.50g
Question 19
What volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at constant temperature and pressure? The equation for reaction is 2NH3(g) → N2(g) + 3H2(g)
- A. 50cm3
- B. 150cm3
- C. 200cm3
- D. 300cm3
Question 20
Which of the following decreases when a given mass of gas is compressed to half its initial volume?
- A. Average intermolecular distance
- B. Frequency of collisions
- C. Number of molecules present
- D. Atomic radius of each particle
