Jamb Chemistry Past Questions and Answers

Question 406:

• JAMB 1985

2MnO^-₄ + 10Cl^- + 16H⁺ → 2Mn²⁺ + 5Cl₂ + 8H₂O. Which of the substances serves as an oxidizing agent?

A. Mn²⁺
B. Cl^-
C. H₂O
D. MnO^-₄
E. Cl₂

Question 407:

• JAMB 1985

Which of the following metals will displace iron from a solution of iron(ll)tetraoxosulphate(lV)?

A. Copper
B. Mercury
C. Silver
D. Zinc
E. Gold

Question 408:

• JAMB 1985

In the reaction H_2(g)O \(\to\) H_2(g) + 1/2O_2(g)
ΔH = -2436000 KJ, which of the following has no effect on the equilibrium position?

A. Adding argon to the system
B. Lowering the temperature
C. Adding hydrogen to the system
D. Decreasing the pressure
E. Increasing the temperature

Question 409:

• JAMB 1985

Complete hydrogenation of ethyne yields?

A. Benzene
B. Methane
C. Ethane
D. Ethene
E. Propane

Question 410:

• JAMB 1985

Which of the following is used in the manufacture of bleaching powder?

A. Sulphur dioxide
B. Chlorine
C. Hydrogen tetraoxosulphate (VI)
D. Hydrogen sulphide
E. Nitrogen dioxide