Ritu was given four test tubes containing different solutions as shown in figure. Choose the incorrect option.

1 and 2 turn blue litmus to red.

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1 and 4 turn China rose indicator to green.

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Phenolphthalein remains colourless with 2 and 3.

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4 turns turmeric solution to red.

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Solution

The correct option is B 1 and 4 turn China rose indicator to green.
Indicators are substances that are used to test whether a substance is acidic or basic or neutral in nature. They change their color when added to a solution having acidic or basic substances. A solution of china rose turns green in basic solution and bright pink in acidic medium. So 1 is acidic in nature so does not give green solution.
Turmeric gives red color in basic medium in tube 4.

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The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(d) phenolphthalein and litmus

Q58) Consider the following statements about acid-base indicators.

i) Phenolphthalein gives a pink colour if the solution is acidic.

ii) China rose indicator turns acidic solutions to dark pink.

iii) Blue litmus turns red for a basic solution.

Which of the above statements are true?

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