If a blue litmus paper is first dipped in dilute HCl and then in dilute NaOH solution, the final colour change of the paper would be from to .

red

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green

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blue

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pink

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Solution

The correct option is C blue
Acids turn blue litmus paper red while bases turn red litmus paper to blue.

Hence, when the blue litmus paper is first dipped in dilute HCl solution, the colour of the paper turns red. When this paper is dipped in dilute NaOH solution, the colour changes to blue.

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If a blue litmus paper is first dipped in dilute HCl and then in dilute NaOH solution, the final colour change of the paper would be from to .

The correct option is C blueAcids turn blue litmus paper red while bases turn red litmus paper to blue. Hence, when the blue litmus paper is first dipped in dilute HCl solution, the colour of the paper turns red. When this paper is dipped in dilute NaOH solution, the colour changes to blue.

The correct option is C blue
Acids turn blue litmus paper red while bases turn red litmus paper to blue.

Hence, when the blue litmus paper is first dipped in dilute HCl solution, the colour of the paper turns red. When this paper is dipped in dilute NaOH solution, the colour changes to blue.