std 11 economics annual exam blueprint & full paper solution April 2022 | dhoran 11 paper solution

Blue litmus paper turns on contact with an acidic solution.

In the preparation of ultra filter paper collodion solution is used collodion is

How does a soap solution behave with red litmus paper ?

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: