Chemistry Mock Test

1

What is the correct chemical formula for sulfur dioxide?

A. SO

B. SO₂

C. SO₃

D. S₂O

2

What is the correct chemical formula for nitric acid?

A. HNO₂

B. HNO₃

C. H₂NO₃

D. HN₃

3

What is the correct name for the compound Ca(OH)₂?

A. Calcium oxide

B. Calcium hydroxide

C. Calcium carbonate

D. Calcium bicarbonate

4

What is the correct name for the compound H₂CO₃?

A. Carbonic acid

B. Hydrochloric acid

C. Acetic acid

D. Formic acid

5

In the balanced equation: 4NH₃ + 5O₂ → 4NO + 6H₂O, what is the coefficient of O₂?

A. 3

B. 4

C. 5

D. 6

6

In the balanced equation: 2Na + 2H₂O → 2NaOH + H₂, what is the coefficient of NaOH?

A. 1

B. 2

C. 3

D. 4

7

Which of the following is an example of a mixture?

A. Pure water (H₂O)

B. Table salt (NaCl)

C. Air

D. Carbon dioxide (CO₂)

8

Which of the following is an example of a compound?

A. Oxygen gas (O₂)

B. Gold metal (Au)

C. Saltwater

D. Water (H₂O)

9

In an oxidation-reduction (redox) reaction:

A. Only oxidation occurs

B. Only reduction occurs

C. Both oxidation and reduction occur simultaneously

D. Neither oxidation nor reduction occurs

10

What is the percent composition of oxygen in NaHCO₃? (Atomic weights: Na=23, H=1, C=12, O=16)

A. 19.0%

B. 38.1%

C. 57.1%

D. 76.2%

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