NCERT Exemplar III — task. Science CBSE, Class 7.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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1. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed

Red in acid and blue in base
Pink in acid and yellow in base
Yellow in acid and red in base
Yellow in both acid and base

2. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

pink and colourless
red and blue
blue and red
colourless and pink

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