Jamb Chemistry Past Questions and Answers

Question 346:

• JAMB 1983

A jet plane carrying 3,000 kg of ethane burns off all the gas forming water and carbondioxide. if all the carbondioxide is expelled and all the water formed is condensed and kept on board the plane, then the gain in weight is

A. 1,800 kg
B. 900 kg
C. 600 kg
D. 2, 400 kg
E. 1, 200 kg

Question 347:

• JAMB 1983

Liquid X, reacts with sodium trioxocarbonate (IV) (Na₂CO₃) to give a gas which turns calcium chloride solution milky X is

A. Na₂SO₄(aq)
B. Kl (aq)
C. An alkali
D. An acid
E. A hydrocarbon

Question 348:

• JAMB 1983

Which of the following statements is FALSE?

A. Copper (ll) ion can be reduced to copper (l) ion by hydrochloric acid and zinc
B. Sodium metal dissolves in water giving oxygen
C. Nitrogen is insoluble in water
D. Carbondioxide is soluble in water
E. Lead has a higher atomic weight than copper

Question 349:

• JAMB 1983

When sodium dioxonitrate (lll) (NaNO₂) dissolves in water, ∆H is positive. The process of dissolution is

A. Exothermic
B. Endothermic
C. Isothermal
D. Isomeric
E. Hygroscopic

Question 350:

• JAMB 1983

The equilibrium reaction between copper (l) chloride and chlorine at 25^oC and 1 atmosphere is represented by the equation:
2CuCl +Cl₂ ⇌ 2 CuCl₂ ∆H = - 166 KJ. Which of the following statements is TRUE for the reaction, pressure remaining constant?

A. More CuCl is formed at 40^oC
B. More CuCl₂ is formed at 10^oC
C. Less CuCl₂ is formed at 10^oC
D. There is no change in the amount of CuCl₂ formed at 40^oC and10^oC
E. More CuCl is consumed at 40^oC