The acidic or basic nature of a substance is tested by using

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Both 1 & 2

Salt solution

Indicator

Litmus paper

answer is D.

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Detailed Solution

The acidic or basic nature of a substance is tested by using indicator and litmus paper.
Litmus paper is used to detect the acidic or basic nature of the substance. When the blue litmus paper is dipped in acid, it changes its colour to red. Acid-base indicators are also known as pH indicators which show a change in colour with pH.

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