A substance changes the colour of indicator Y to blue and that of indicator Z to pink. It is soapy to touch and is bitter in taste. Identify Y and Z.

Y - Red cabbage, Z - Blue litmus

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Y - Red litmus, Z - Phenolphthalein

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Y - Blue litmus, Z - Turmeric

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Y - Turmeric, Z - Phenolphthalein

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Solution

The correct option is B Y - Red litmus, Z - Phenolphthalein

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Question 4

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