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NECO Past Questions and Answers - Page 99

491.

Chlorine is used in water purification because it

A.

bleaches impurities in the water

B.

decolorizes water

C.

destroys bacteria

D.

is extremely soluble in water

E.

is pleasant tasting

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

492.

Which statement is NOT true about the composition of starch?

A.

It contains only the atoms of carbon, hydrogen oxygen

B.

It is a polysaccharide

C.

Its empirical formula is C₂H₂0.

D.

It is made from the monomerC₆H₁₂O₆.

E.

The hydrogen and oxygen atoms are in the ratio 2:1.

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

493.

Which compound is a component of baking powder?

A.

Na₂CO₃

B.

Na₂SO₄

C.

KH₂CO₃

D.

NaHCO₃

E.

NaHSO₄

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

494.

if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?

A.

XY

B.

X₂Y

C.

XY₂

D.

X₃Y₂

E.

X₂Y₃

View answer & explanation

Correct answer is E

Element X is aluminum of valency 3+

Element Y is oxygen of valency 2-

Their combination is $Al_{2}O_{3}$

495.

When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm³ of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?

A.

164 cm³

B.

168 cm³

C.

179.1.cm³

D.

201.5cm³

E.

546 cm³

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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