Jamb Chemistry Past Questions and Answers

Question 1576:

• JAMB 2010

In the preparation of oxygen by heating KClO₃ in the presence of MnO₂, only moderate heat is needed because the catalyst acts by

A. Lowering the pressure of the reaction
B. Increasing the surface area of the reactant
C. Increase the rate of the reaction
D. Lowering the energy barrier of the reaction

Question 1577:

• JAMB 2010

The graph above demonstrate the effect of

A. Surface area on the rate of reaction
B. Catalyst on the rate of reaction
C. Pressure on the rate reaction
D. Concentration on the rate of reaction

Question 1578:

• JAMB 2010

2H_2(g) + O_2(g) → 2H₂O_(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?

A. It is unaffected
B. It becomes zero
C. It decrease
D. It increase

Question 1579:

• JAMB 2010

To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of

A. CO^-
B. Cl^-
C. SO^-
D. NO

Question 1580:

• JAMB 2010

Which of the following is used in rocket fuels?

A. HNO₃
B. CH₃COOH
C. H₂SO₄
D. HCl