- The electronic configuration of an element is 1S2 2S2 2P6 3S2 3P3. How many unpaired electrons are there in the element?
- A. 5
- B. 4
- C. 3
- D. 2
2. Which of the following can be obtained by fractional distillation?
- A. Nitrogen from liquid air
- B. Sodium Chloride from sea water
- C. Iodine from solution of Iodine in carbon tetrachloride
- D. Sulphur from the solution of sulphur in carbon disulphide
3. Duralumin consists of aluminum, copper?
- A. Zinc and Gold
- B. Lead and Manganese
- C. Nickel and Silver
- D. Manganese and Magnesium
4. An example of a polysaccharide is?
- A. Dextrose
- B. Mannose
- C. Glucose
- D. Starch
5. 8g of CH44 occupies 11.2 at S.T.P. What volume would 22g of CH3CH2CH3 occupy under the same condition?
- A. 3.7dm3
- B. 11.2dm3
- C. 22.4dm3
- D. 33dm3
6. The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?
- A. with cool running water
- B. sodium hydroxide solution
- C. iodine solution
- D. sodium trioxonitrate(v) solution
7. Which of the gas laws does this graph illustrate?
- A. Boyle
- B. Charles
- C. Gay-Lussac
- D. Graham
8. What are the possible oxidation numbers of an element if its atomic number is 17?
- A. -1 and 7
- B. -1 and 6
- C. -3 and 5
- D. -2 and 6
9. What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
- A. Steam distillation
- B. Destructive distillation
- C. Liquefication
- D. Hydrolysis
10. Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the ?
- A. Acid
- B. Ester of alkanoic acid
- C. Alkali
- C. Alkanol
11. When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?
- A. Oxyethene
- B. Oxyhydrocarbon flame
- C. Oxyacetylene flame
- D. Oxymethane flame
12. Which of the following substances is a mixture?
- A. Granulated sugar
- B. Seawater
- C. Sodium chloride
- D. Iron filling
13. If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?
- A. 1.650atm
- B. 0.825atm
- C. 0.413atm
- D. 0.275atm
14. Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?
- A. P
- B. Q
- C. R
- D. S
15. The products of the thermal decomposition of ammonium trioxonitrate(v) are?
- A. Nitrogen (I) Oxide and Water
- B. Ammonia and Oxide
- C. Nitrogen and Water
- D. Nitrogen (IV) Oxide and Water
