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(C) The pH paper turning yellowish-orange indicates that the soil solution is acidic (pH < $7$).To change the colour of the pH paper to greenish-blue,

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An antacid

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(C) The pH paper turning yellowish-orange indicates that the soil solution is acidic (pH To change the colour of the pH paper to greenish-blue,we need to add a substance that is basic (alkaline) in nature (pH > $7$).$A$. Lemon juice is acidic.$B$. Vinegar is acidic.$C$. An antacid is basic (alkaline) and neutralizes the acid,shifting the pH towards the basic range (greenish-blue).$D$. Common salt is neutral.

$A$ sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

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