Subject: Bio - Chemistry

#33

Which of the following is a chemical formula for methane?

A) CO2

B) CH4

C) NH3

D) H2SO4

Answer:   B

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#34

Which law states that mass is neither created nor destroyed in a chemical reaction?

A) Law of Conservation of Mass

B) Law of Multiple Proportions

C) Law of Constant Composition

D) Boyle’s Law

Answer:   A

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#35

What is the function of enzymes in biochemical reactions?

A) Inhibit reactions

B) Slow down reactions

C) Speed up reactions

D) Destroy reactants

Answer:   C

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#36

Which acid is found in the stomach?

A) Sulfuric acid

B) Hydrochloric acid

C) Acetic acid

D) Citric acid

Answer:   B

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#37

How many protons are in a hydrogen atom?

A) 0

B) 1

C) 2

D) 3

Answer:   B

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#38

What determines the chemical properties of an element?

A) Mass number

B) Neutrons

C) Electrons

D) Protons

Answer:   C

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#39

What is the valency of oxygen?

A) 1

B) 2

C) 3

D) 4

Answer:   B

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#40

Which is an example of exothermic reaction?

A) Melting of ice

B) Boiling water

C) Combustion of fuel

D) Photosynthesis

Answer:   C

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