You are Nihar Saxena, a resident of 58 Area colony, Bhopal. Write a letter to your sister
who lives in a hostel advising her to take precaution against Covid-19.
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We can identify the content in each of the test tubes using red litmus paper. This can be done by noticing the colour change of the red litmus paper.
On litmus paper, the three solutions in the test tubes are poured separately.
The solution which turns red litmus to blue contains a basic solution.
Divide the formed blue litmus paper into two parts.
The solution from the test tube which turns blue litmus paper to red will be the acidic solution.
Solution of the test tube which do not change either red or blue litmus paper contain water.
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