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Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

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1,026.

Which statement is NOT true about the composition of starch?

It contains only the atoms of carbon, hydrogen oxygen

It is a polysaccharide

Its empirical formula is C₂H₂0.

It is made from the monomerC₆H₁₂O₆.

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.

1,027.

Which compound is a component of baking powder?

Na₂CO₃

Na₂SO₄

KH₂CO₃

NaHCO₃

NaHSO₄

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,028.

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?

X₂Y

XY₂

X₃Y₂

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 $Al_{2}O_{3}$

1,029.

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.?

164 cm³

168 cm³

179.1.cm³

201.5cm³

546 cm³

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,030.

A measure of the degree of disorderliness in a chemical system is known as the

activation energy

enthalpy

entropy

equilibrium

free energy.

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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