Waec Chemistry Past Questions For Year 2001
Question 46
Which of the following acids forms normal salts only?
- A. Tetraoxosulphate (VI) acid
- B. Trioxosulphate (IV) acid
- C. Tetraoxophosphate (V) acid
- D. Trioxonitrate (V) acid
Question 47
A visible change is observed when a strip of iron is placed in an aqueous solution of
- A. FeSO4
- B. ZnSO4
- C. CuSO4
- D. MgSO4
Question 48
Which of the compounds will leave a metal residue when heated?
- A. Cu(NO 3 )2
- B. AgNO3
- C. K2CO3
- D. CaCO3
Question 49
CuSO4 5H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by
- A. evaporation to dryness
- B. using chromatography
- C. precipitation
- D. crystallization
Question 50
Equal amounts of marble chips are reacted separately with 100cm3 of hydrochloric acid of different concentrations . if all the marble chips reacted, which of the following remained the same in each case?
- A. Average rate of evolution of gas
- B. Total mass of gas evolved during the reaction
- C. Time taken for the reaction to reach completion
- D. lnitial reaction rates
