JAMB Chemistry Past Questions (2010)

Q1. Permanent hardness of water can be removed by

A. Adding slaked lime

B. Adding caustic soda

C. Boiling

D. Filtration

Answer: B

Q2. The final products of the reaction between methane and chloride in the presence of ultraviolet light are hydrogen chloride and

A. Dichloromethane

B. Tetrachloromethane

C. Chloromethane

D. Trichloromethane

Answer: B

Q3. Benzene reacts with hydrogen in the presence of nickel catalyst at 1800C to give

A. Toluene

B. Cyclopentane

C. Cyclohexane

D. Xylene

Answer: C

Q4. Calculate the solubility in mol dm -3 of 40g of Cu So4 dissolved in 100g of water at 1200C {Cu = 64, S = 32, 0 = 16}

A. 2.5

B. 0.4

C. 0.25

D. 4

Answer: A

Q5. Iron can be protected from corrosion by coating the surface with

A. Silver

B. Copper

C. Zinc

D. Gold

Answer: C

Q6. Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V) {Ca = 40, N = 14, O = 16}

A. 13.10%

B. 17.10%

C. 27.60%

D. 8.5

Answer: D

Q7. A noble gas with a high power of fog penetration used in aerodrome beacons is

A. Argon

B. Helium

C. Neon

D. Krypton

Answer: C

Q8. Which of the following salts is slightly soluble in water

A. CaSO4

B. Na2CO3

C. PbCl2

D. AgCl

Answer: A

Q9. 2H2(g) + O2(g) ⇌ 2H2O(g) ΔH = - ve What happens to the equilibrium constant of the reaction above if the temperature is increased?

A. It becomes zero

B. It decreases

C. It increases

D. It is unaffected

Answer: B

Q10. Two hydrocarbons X and Y were treated with bromine water. Decolorized the solution and Y did not. Which class of compound does Y belong

A. Alkynes

B. Alkenes

C. Alkanes

D. Benzene

Answer: C

Q11. Which of the following is used as fuel in miners’ lamp

A. Ethyne

B. Ethane

C. Ethane

D. Ethanol

Answer: A

Q12. The volume of a gas is Vcm3 at P mm Hg. What is the new volume of the gas if the pressure is reduced to half at constant temperature

A. 2 V cm3

B. V 2cm3

C. V cm3

D. 4 V cm3

Answer: A

Q13. Which of the following is used as a rocket fuel

A. CH3COOH

B. H2SO4

C. HCL

D. HNO3

Answer: D

Q14. The IUPAC nomencalatyre of the compound LiAIH4 is

A. Aluminium tetrahydrido lithium

B. Tetrahydrido lithium aluminate (III)

C. Lithium aluminium hydride

D. Lithium tetrahydridoaluminate (III)

Answer: D

Q15. How many unpaired electron(s) are there in the nitrogen sub - levels

A. 2

B. 1

C. 0

D. 3

Answer: D

Q16. A constituent common to moist air, it gradually rusts. This is due to the formation of

A. Silver

B. Copper

C. Tin

D. Lead

Answer: C

Q17. Which of the following is an example of a mixture

A. Blood

B. Sand

C. Washing soda

D. Common salt

Answer: A

Q18. The compound that is used as an anaesthetic is

A. CHCI3

B. CH2C2

C. CH3CI

D. CCI4

Answer: A

Q19. The colour of methyl orange in alkaline medium is

A. Pink

B. Orange

C. Red

D. Yellow

Answer: D

Q20. One of the major uses of Alkanes is

A. In the hydrogenation of oils

B. In the textile industries

C. In the production of plastics

D. As domestic and industrial fuels

Answer: D