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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1,441.

Consider the reaction represented by the following equation: Zn_(s) + 2HCI_(aq) → ZnCI_2(aq) + H_2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm^-3]

1.12 dm³

2.24dm³

4.48dm³

8.96dm³

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,442.

If 5.00cm³ of 0.20 mol dm^-3Na₂CO₃ was diluted with distilled water to obtain 250 cm³ solution, what is the concentration of the resulting solution?

0.004 mol dm^-3

0.02 mol dm^-3

0.20mol dm^-3

0.40mol dm^-3

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,443.

Which of the following compounds with the corresponding masses contain the highest percentage of nitrogen? [N = 14]

NH₃ = 17

NH₄CI = 53.5

NH₄NO₃ = 80

(NH₃)₂SO₄ = 132

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Correct answer is A

No explanation has been provided for this answer.

1,444.

What is the mass of 6.02 x 10²⁴ atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10²³ atoms mol^-1]

240g

24g

2.4g

0.24g

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Correct answer is A

No explanation has been provided for this answer.

1,445.

The force of attraction between covalent molecules is?

electrostatic attraction

hydrogen bonding

ionic force

van der Waals forces

View answer & explanation

Correct answer is A

Covalent bond involves the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons.