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BECE Science 2020 Paper

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Question : 38

Total: 40

Which of the following statements about acids correct

I. They react with the calcium carbonate to give a gas

II. They turn red litmus paper blue

III. They react with reactive metals to give a gas

IV. They turn blue litmus paper red

I, II and IV only
I, II and III only
II, III and IV only
I, III and IV

Solution:

Concept:

Acids have characteristic reactions with indicators, metals, and carbonates.

Explanation:

Acids react with calcium carbonate to release carbon dioxide gas,

\mathrm{CO}_2

.

So statement I is correct.

Acids turn blue litmus paper red, not red litmus paper blue.

So statement II is incorrect and statement IV is correct.

Acids react with reactive metals to produce hydrogen gas,

\mathrm{H}_2

.

So statement III is correct.

Therefore, the correct statements are I, III, and IV.

Answer:

D. I, III and IV only

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