WAEC Chemistry Past Questions & Answers - Page 281

1,401.

Which of the following pollutants is biodegradable ?

A.

Sewage

B.

Plastics

C.

Metal scrape

D.

Lead compounds

E.

Hydrogen sulphide

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,402.

MO and X 2O represent the formula of oxides of elements M and X respectively . If M and X should combine to form a separate compound, what would be the formula of the compound?

A.

MX₂

B.

M₂X

C.

MX

D.

M₃X₂

E.

MX₃

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,403.

What is the molecular formula of a compound whose empirical formula is CH2O and molar mass is 180? (H = 1, C = 12, O = 16)

A.

C ₄H ₈O₂

B.

C ₄H ₈O₃

C.

C ₆H ₁₀O₅

D.

C ₆H ₁₂O₆

E.

C ₁₂H ₂₂O₁₁

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,404.

The compound of copper which is used in electroplating dyeing, printing, wood preservation and as a fungicide is

A.

copper (ll) hydroxide

B.

copper (ll) trioxonitrate (V) pentahydrate

C.

copper (ll) tetraoxosulphate (VI) pentahydrate

D.

copper (ll) oxide

E.

copper (ll) trioxocarbonate (lV)

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,405.

Which of the following salts in aqueous solution will have a pH greater than 7?

A.

NaCl

B.

ACI₃

C.

FeCI₃

D.

Na ₂SO₄

E.

K ₂CO₃

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

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