Samajik vigyan paper solution

Note the change in colour when a blue litmus paper is dipped in an aqueous solution of sodium hydroxide.

When the strip of pH paper was put in a given solution the pH paper changes to orange red. The given solution is most likely to be of:

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Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.

Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution ? Explain.

The test tube I contains sodium bicarbonate solution whereas test tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns:

In a experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in foru beakes containig solutions A,B, C and D. The colour of universal indicator paper in these solutions is a shown below: The solution having lowes pH value is:

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