Question 61:

• JAMB 2019

Hydrogen diffused through a porous plug

A. Thrice as fast as oxygen
B. At the same speed as oxygen
C. Four times as fast as oxygen
D. Twice as fast as oxygen

Question 62:

• JAMB 2019

X is a substance which liberates CO₂ on treatment with concentrated H₂SO₄. A warm solution of X can decolorize acidified KMnO₄. X is

A. HCOOH
B. NaH CO₃
C. FeCO₃
D. H₂C₂O₄

Question 63:

• JAMB 1978

Zinc Oxide is a

A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide
D. Neutral Oxide
E. Reactive Oxide

Question 64:

• JAMB 1978

Zinc Oxide is a

A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide
D. Neutral Oxide
E. Reactive Oxide

Question 65:

• JAMB 1978

When sodium chloride and metallic sodium are each dissolved in water

A. Both processes are exothermic
B. Both processes are endothermic
C. The dissolution of metallic sodium is endothermic
D. The dissolution of metallic sodium is exothermic
E. The dissolution of sodium chloride is explosive