Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide, and the third is a sugar solution. How will you identify them? You have only turmeric indicator.
ScienceClass 7CBSEAnswered 27 Mar 2026
Answer
Solution:
The following steps are taken to test the given liquids:
- Put a drop of provided liquid on the turmeric indicator. The solution that changes the colour of the indicator to red is sodium hydroxide, which is basic in nature.
- Now, to make two mixtures, add a drop of sodium hydroxide on the other two liquids individually.
- The drop of each combination added to the turmeric indicator one after another.
- The mixture that changes the indicator to red colour includes a neutral solution of sugar.
- While the mixture contains hydrochloric acid that has been neutralised by the addition of sodium hydroxide, which does not show any colour change in the indicator.
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