WAEC Past Questions and Answers - Page 1816

9,076.

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.

9,077.

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.

9,078.

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.

9,079.

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.

9,080.

The gas that is liberated when iron is heated with concentrated tetraoxosulphate (VI)acid is

A.

H₂S

B.

\(SO_{2}\)

C.

HCI

D.

SO₃

E.

O₂

View answer & explanation

Correct answer is B

2Fe (s) + 6H2SO4 (l) → Fe2(SO4)3 (aq) + 3SO2 (g) + 6H2O (l)

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