Test Index

WAEC Agriculture 2015 Paper

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Question : 18

Total: 57

A farmer continuously applies sulphate of ammonia to his faemland for many years, the resulatant soil solution is most likely to

Leave blue litmus paper unchanged
Change blue litmus paper to re
Change red litmus paper to blue
Be rich in soil microbes

Solution:

Concept:

Continuous use of sulphate of ammonia increases soil acidity.

Explanation:

Sulphate of ammonia is

\left(\mathrm{NH}_4\right)_2\mathrm{SO}_4

.

Repeated application causes nitrification to release

\mathrm{H}^+

ions.

This makes the soil solution acidic.

Acidic solutions turn blue litmus paper red.

Hence, the resultant soil solution will change blue litmus paper to red.

Answer:

B. Change blue litmus paper to red

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