Litmus papers are generally available in _ and __ colours.

red, blue

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red, pink

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blue, black

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blue, pink

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Solution

The correct option is A red, blue
Litmus paper is a strip of paper extracted from lichens, which is dipped into a solution to determine if it is an acid or base. Litmus papers are generally available in two colours, red and blue. Acidic solutions will change the color of the blue litmus to red strips. Basic solutions will change the color of the red litmus strips to blue strips.

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Q. Litmus papers are available in _____ and ______ colours.

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a) A red litmus paper is dipped in a solution of calcium hydroxide.

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(a) There is no change in the blue litmus paper and the red litmus paper turns white.

(b) There is no change in the red litmus paper and the blue litmus paper turns red.

(c) There is no change in the blue litmus paper and the red litmus paper turns blue.

(d) No change in colour is observed in both the litmus papers.

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Litmus papers are generally available in _____ and ______ colours.

Litmus papers are generally available in _ and __ colours.