Year :
1985
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
1 - 3 of 3 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
Which of the following oxides is amphoteric? A. Na2O B. Fe2O3 C. AI2O3 D. CaO E. CuO |
C |
| 2. |
Chlorine is prepared on a large scale by the A. electrolysis of concentrated sodium chloride solution B. action of manganese (IV) oxide on hot concentrated hydrochloric acid C. action of concentrated tetraoxosulphate (IV) acid on sodium chloride D. oxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII) E. action of dilute mineral acids on bleaching powder |
A |
| 3. |
A sample of air that has been passed through caustic potash will A. contain more oxygen than nitrogen B. rekindle a glowing splint C. have no action on lime water D. contain no water vapour E. be free of noble gases Detailed Solution- Potassium hydroxide also absorbs carbon dioxide from the air. - If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white. - |
| 1. |
Which of the following oxides is amphoteric? A. Na2O B. Fe2O3 C. AI2O3 D. CaO E. CuO |
C |
| 2. |
Chlorine is prepared on a large scale by the A. electrolysis of concentrated sodium chloride solution B. action of manganese (IV) oxide on hot concentrated hydrochloric acid C. action of concentrated tetraoxosulphate (IV) acid on sodium chloride D. oxidation of concentrated hydrochloric acid with potassium tetraxosulphate (VII) E. action of dilute mineral acids on bleaching powder |
A |
| 3. |
A sample of air that has been passed through caustic potash will A. contain more oxygen than nitrogen B. rekindle a glowing splint C. have no action on lime water D. contain no water vapour E. be free of noble gases Detailed Solution- Potassium hydroxide also absorbs carbon dioxide from the air. - If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white. - |