A teacher gave two test tubes, one containing water and the other containing sodium hydroxide solution, to the students and asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for correctly identifying the test tube containing sodium hydroxide solution?

Blue litmus paper

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Red litmus paper

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Sodium carbonate solution

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Dilute hydrochloric acid

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Solution

The correct option is B Red litmus paper
Red litmus paper will turn blue when it is dipped in a basic solution. So, the student can use red litmus paper to identify the test tube containing sodium hydroxide solution, which is basic.

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The correct option is B Red litmus paperRed litmus paper will turn blue when it is dipped in a basic solution. So, the student can use red litmus paper to identify the test tube containing sodium hydroxide solution, which is basic.

The correct option is B Red litmus paper
Red litmus paper will turn blue when it is dipped in a basic solution. So, the student can use red litmus paper to identify the test tube containing sodium hydroxide solution, which is basic.