Jamb Chemistry 1983 Past Questions and Answers

Question 46:

• 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

Question 47:

• JAMB 1983

zn + 2HCl → ZnCl₂ + H₂
The rate of the above reaction will be greatly increased if

A. The zinc is in the powered form
B. A greater volume of the acid is used
C. A smaller volume of the acid is used
D. The reaction vessel is immersed in an ice-bath
E. The zinc is in the form of pellets

Question 48:

• JAMB 1983

Zn + H₂ SO₄ → ZnSO₄ + H₂
in the above reaction how much zinc will be left of 1.0 M of H₂SO?
[Zn =65, s = 32, O = 16, H = 1]

A. 1.35g
B. 1.00g
C. 0.70g
D. 0.65g
E. 0.00g

Question 49:

• JAMB 1983

30 cm³ of 0.1 M Al (NO₃)₃ SOLUTION IS RECTED WITH 100cm³ of 0.15M of NaOH solution. Which reactant is in excess, and by now much ?

A. NaOH solution by 70 cm³
B. NaOH solution, by 60 cm³
C. NaOH solution by 40 cm³
D. Al(NO₃)₃ solution by 20 cm³
E. Al(NO₃)₃ solution by 10 cm³

Question 50:

• JAMB 1983

In the above experiment, the litmus paper will initially

A. Be bleached
B. Turn green
C. Turn red
D. Turn blue
E. Turn black