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BECE Science 2016 Paper

Question : 20

Total: 40

Solution:

Concept:

A base is a substance that turns red litmus paper blue.

Explanation:

Sodium hydroxide (

\mathrm{NaOH}

) is a common base.

Bases have a pH greater than

7

, not less than

7

Acids turn blue litmus paper red; bases turn red litmus paper blue.

Therefore, sodium hydroxide is a base because it turns wet red litmus paper blue.

Answer:

D. turns wet red litmus paper blue.

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