Jamb Chemistry 2006 Past Questions and Answers

Question 36:

• JAMB 2006

2C₂H_2(g) + 5O_2(g) → 4CO_2(g) + 2H₂O_(g)
In the reaction above, the mass of carbon(IV)oxide produced on burning 78 g of ethyne is
[C =12, O = 16, H = 1]

A. 264 g
B. 39 g
C. 352 g
D. 156 g

Question 37:

• JAMB 2006

The ion that can be used as an oxidizing agent is

A. Au³⁺
B. Fe³⁺
C. ClO^-
D. Ca²⁺

Question 38:

• JAMB 2006

H_2(g) + Br_2(g) → 2HBr_(g)
The above reaction is carried out at 25^oC. ΔH is -72 kJ mol^-1 and ΔS is - 106 J mol^-1K^-1, the reaction will

A. Not proceed spontaneously at the given
B. Proceed spontaneously at the given temperature
C. Proceed in the reverse direction at the given temperature
D. Proceed spontenously at lower temperature

Question 39:

• JAMB 2006

Zinc and carbon rods are used as anode and cathode respectively in a

A. Leclanche cell
B. Lead accumulator
C. Daniel cell
D. Voltaic cell

Question 40:

• JAMB 2006

The solution that will conduct the highest amount of electricity is

A. 0.5 mol dm^-3 of hydrochloric acid
B. 2.0 mol dm^-3 of hydrochloric acid
C. 0.5 mol dm^-3 ethanoic acid
D. 2.0 mol dm^-3 ethanoic acid