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(C) $1$. The $pH$ paper turning yellowish-orange indicates that the soil solution is acidic (typically $pH$ range $5-6$).$2$. To change the colour of

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An antacid

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(C) $1$. The $pH$ paper turning yellowish-orange indicates that the soil solution is acidic (typically $pH$ range $5-6$).$2$. To change the colour of the $pH$ paper to greenish-blue,we need a substance that is basic (alkaline),as basic solutions turn $pH$ paper towards blue/green $(pH > 7)$.$3$. Lemon juice and vinegar are acidic. Common salt $(NaCl)$ is neutral.$4$. An antacid is a mild base used to neutralize excess stomach acid,making it the correct choice to shift the $pH$ towards the basic range.

$A$ 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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