WAEC Past Questions and Answers - Page 1812

9,056.

What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3 g of the compound? (Na₂CO₃ = 106)

A.

0.05

B.

0.10

C.

0.20

D.

0.50

E.

2.00

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

9,057.

When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is

A.

carbon (IV) oxide

B.

nitrogen

C.

oxygen

D.

water vapour

E.

noble gases

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

9,058.

The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their

A.

physical states

B.

melting points

C.

Rf. values

D.

solubility

E.

boiling points

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

9,059.

In which of the following is the oxidation number of nitrogen zero?

A.

SO₂ and NH₃

B.

NaNO₃

C.

HNO₂

D.

NOI₃

E.

N₂

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

9,060.

The metal extracted from cassiterite is

A.

calcium

B.

copper

C.

tin

D.

sodium

E.

lead

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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