A sample of soil is collected from a garden. When this sample is mixed with the red cabbage extract, the color of the extract changes to light pink. Which of the following should be added to make the soil suitable for plant growth?

Quicklime

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Lemon extract

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Vinegar

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Slaked lime

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Solution

The correct option is D
Slaked lime

We know that a neutral soil is suitable for growth of plants. As the soil sample turned the color of extract of red cabbage light pink, it means that the soil is acidic. Hence to make it neutral we should add a base to the soil. Therefore quicklime or slaked lime is desirable.

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