Waec Chemistry Past Questions For Year 2010
Question 31
The quantity of electricity required to discharge 1 mole of univalent ion is
- A. 9,600 C
- B. 48,250 C
- C. 96,500 C
- D. 193,00 C
Question 32
What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)
- A. +3 to + 2
- B. + 4 to + 2
- C. + 5 to + 2
- D. + 7 to 2
Question 33
Which of the following substances cannot be classified as a heavy chemical?
- A. AgNO3
- B. CaO
- C. CaOCI2
- D. H2SO4
Question 34
The main function of limestone in the blast furnance is to
- A. act as a reducing agent
- B. act as a catalyst
- C. remove impurities
- D. supply carbon (IV) oxide
Question 35
Compound N reacts with sodium metal to produce a gas that gives a 'pop' sound with a burning splint N also react with ethanoic acid to give a sweet smelling liquid. Compound N is an
- A. alkanol
- B. alkanoate
- C. alkane
- D. alkanoic acid
