Gujarati paper solution

Probability | JEE Mains 2018 Online Paper Solution | All Shift

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:

\(H_{2}\)S gas changes a filter paper dipped in lead acetate solution into :- Black Red Green Yellow