Question 181:

• JAMB 1980

When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?

A. Turn moist red litmus paper blue
B. Turn lime water milky
C. Blacken lead acurate paper
D. Rekindle a glowing splint
E. Burn a sqeakly pop

Question 182:

• JAMB 1980

In which of the following is the oxidation state of oxygen different from its value in water?

A. OH^-
B. H₃O⁺
C. O^-
D. H₂O₂
E. SO₂

Question 183:

• JAMB 1980

Which of the following silver halides is readily soluble in ammonium hydroxide?

A. Agl
B. AgBr
C. AgCl
D. AgF
E. None of the above

Question 184:

• JAMB 1980

The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?

A. Oxidation
B. Hydrolysis
C. Dissociation
D. Reduction
E. Disproportionation

Question 185:

• JAMB 1980

Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?

A. Electrons flow towards the zinc rod
B. The zinc rod dissolves
C. The temperature of the soil changes
D. The blue colour of the solution gradually disappears
E. Copper metal is deposited