WAEC Chemistry Past Questions & Answers - Page 287

1,431.

Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?

A.

2KOH+CI₂ → KCIO + KCI + H₂O

B.

4KOH + 2CI → 4KCI + 2H₂O + O₂

C.

6KOH + 3CI₂ → KCIO₃ + 5KCI + 3H₂O

D.

2KOH + CI₂ → 2KCI + H₂O₂

E.

KOH + 2CI₂ + H₂O → KCI + 3HCI + O₂

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,432.

Which of the following is not a naturally occurring iron ore?

A.

FeCl₂

B.

Fe₂O₃O₃

C.

Fe₂O₃

D.

FeCO₃

E.

FeS₂

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,433.

Water gas is a mixture of?

A.

CO_{2 and H₂}

B.

CO and H₂O

C.

CO₂ and CO

D.

CO and N₂

E.

CO and H₂

View answer & explanation

Correct answer is E

Electrolysis of a sodium hydroxide solution produces oxygen at the anode and hydrogen at the cathode.

1,434.

What volume of oxygen will be left unreacted when a mixture of 100cm³ of hydrogen and 200cm³ of oxygen are exploded in a eudiometer?

A.

300cm³

B.

200cm³

C.

150cm³

D.

100cm³

E.

50cm³

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,435.

Bubbling of carbon (IV)oxide into calcium hydroxide solution results in the formation of

A.

CaCO₃

B.

CuCO₃

C.

ZnCO,sub>3

D.

Na₂CO₃

E.

MgCO₃

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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