Safe identification of acids and bases — task. Science CBSE, Class 7 New.

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

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Analyse the questions given below and select the correct answer:

1. Which of the following is not a safe method to identify substances?

Tasting unknown substances
Observing colour change
Using indicators
Using litmus paper

2. Rahul wants to check whether the soap solution in his bottle is basic. Which litmus paper should he use?

Neither red nor blue
Red litmus paper
Neutral litmus paper
Blue litmus paper

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