UTME CHEMISTRY PAST QUESTIONS

Questions originated from jamb and post jamb examinations
1. How much volume of ethane would be required to produce 1.12dm3 of carbon(IV)oxide on combustion in sufficient oxygen?
2C2H6(g)+7O2—–> 4CO2(g) + 6H2O  A) 56 dm3 of ethane B) 2.24-dm3 of ethane C) 0.56 dm3 of ethane D) 5.6 dm3 of ethane
Right choice – Option

2. By how much would the volume have increased when 10dm3 of ozone were converted to oxygen 2O3(g) + 3O2(g)  A). 15dm3 B). 40dm3    C)  0.5 dm3  D) 5 dm3
Right choice – Option

3. The pressure exerted by a gas is as a result of A). The continuous random motion of its particles B). Bombardment of the walls of the container by its molecules C). The collision between the gas molecules D). The elastic nature of the gas mslecules
Right choice – Option

4. Which of the following gas will diffuse at the slowest  A). Ammonium B). Carbon (II) oxide C). Sulphur (IV) oxide D). Nitrogen
Right choice – Option

5. Element P has an electronic configuration of 2, 8,6. Element R has an electronic configuration of 2, 8, 8, 1 What is likely to form
if P and R combine? A). a covalent compound PR B). An ionic compound PR2 C). An ionic compound PR2 D). An ionic compound
Right choice – Option

6. Starch molecules can be broken down into smaller molecules by heating in a dilute acid. What is this type of reaction called
A. Cracking B. Hydrolysis C. Oxidation D. Reduction
Right choice – Option

7. Which of the following cannot be used as an oxidizing agent?.  A) K2Cr2O7  B). CO2 C). H2S  D). HNO3
Right choice – Option

8. What quantity of copper will be deposited by the same quantity of electricity that deposited 18g of aluminium
AL = 27 , Cu= 64   A) 64g B) 32g C). 16g D) 8g
Right choice – Option

10. Which metal has the least tendency to form positive ions? A). Iron B). Aluminium C). Sodium D). Calcium
Right choice – Option

11. What is the number of pairs of shared electrons in a methane molecule? A) 1 B) 2 C) 4 D) 8
Right choice – Option

12. The percentage by volume of nitrogen in air is high because A) Nitrogen is relatively inactive B) Nitrogen supports life C) Nitrogen
prevents corrosion of metals D) Nitrogen increases the rate of combustion
Right choice – Option

EXERCISE

13. Natural water includes the follorving except A) rain water B) spring C) pure water D) lake water

14. Which of the following merhods cannot be used to remove permanent hardness in water? A) addition of washing soda B) addition of
caustic soda C) Permanent method D) adding alum to water

15. If the solubility of sodium tetraoxosulphate(VI) at 30oC is 18g per 100g. How much is this in gramme per kilogram? A) 18kg per1000g B) 180kg per 100g C) 180g per l000kg D) 180g per kg

16. The following are examples of colloid except  A) milk B) starch in water C) aerosol D) ammonium chloride solution

17. Oil spillage in ponds and creeks cleaned by A) Burning off the oil layer B) Spraying with detergent C) Spraying with common salt D)Spraying with hot oil

18. The pH of the solutions M, N, O and P are l, 6, 8 and 10 respectively, therefore A) None of the solution is acidic B) the pH of O is made neutral by water C) P is the most acidic solution D) M is the most acidic solution

19. Which hydroxide dissolves in water to alkaline solution? A. Aluminium hydroxide B. Calcium hydroxide C) copper(II)hydroxide
(D)Iron(III)hydroxide

Facebook Comments
Posted in Uncategorized.