Waec Chemistry Past Questions For Year 2002
Question 6
Which of the following ions require the largest quantity of electricity for discharge at an electrode?
- A. 2.0 mole of Q 3+
- B. 2.5 mole of R2+
- C. 4.0 mole of Y-
- D. 3.0 mole of T-
Question 7
Consider the following equation; Cr2O7(aq)2- + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(I). The oxidation number of chromium changes from
- A. -2 to + 3
- B. - 2 to + 6
- C. + 6 to + 3
- D. + 7 to + 6
Question 8
Which of the following statements about soapless detergents is correct? They
- A. lather readily with hard water
- B. increase the surface tension of water
- C. cause hydrolysis of salts in water
- D. from a curdy precipitate with soft water
Question 9
The following compounds are hydrocarbons except
- A. methylpropanoate
- B. 2-methylbutane
- C. benzene
- D. cyclohexane
Question 10
When alkynes are hydrogenated completely, they produce compounds with the general molecular formula
- A. C nH n
- B. C nH 2n+2
- C. CnH 2n
- D. CnH2n-2
