Waec Chemistry Past Questions
Question 41
Which of the following hydrocarbons is not likely to be present in petrol?
- A. C14H30
- B. C10H22
- C. C9H20
- D. C7H16
- E. C5H12
Question 42
The earthly impurities in iron ore are removed in the blast furnace by the reaction
- A. CO2 + C →2CO
- B. Fe2O3 + 3CO →2Fe + 3CO2
- C. SiO2 + CaO →CaSiO3
- D. CaCO3 → CaO + CO2
- E. C +CO2 → CO2
Question 43
120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g)
- A. 30cm3
- B. 60cm3
- C. 90cm3
- D. 120cm3
- E. 180cm3
Question 44
When an element can exist in two or more forms in the same physical state, the element is said to exhibit
- A. isotopy
- B. isomerism
- C. allotropy
- D. hygroscopy
- E. sublimation
Question 45
Given that for the reaction KOH (aq) + HCI(aq) → KCI(aq) + H2O(L) H = - 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) → Na2SO4(aq) + 2H 2O(l)?
- A. - 108Kj
- B. -54 kj
- C. -27 kj
- D. +27 kj
- E. +54 kj
