Chemistry · Acids, Bases and Salts

'Vanishing ink' or colour can be prepared by mixing phenolphthalein indicator with which of the following substances?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Carbon dioxide water
2Sulphurous acid
3Dilute solution of caustic soda
4Dilute ammonia solution✓

Correct answer

Dilute ammonia solution

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'Vanishing ink' or colour can be prepared by mixing phenolphthalein indicator with which of the following substances?

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'Vanishing ink' or colour can be prepared by mixing phenolphthalein indicator with which of the following substances?

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