Question

An aqueous solution 'A' turns phenolphthalein solution pink
On addition of an aqueous solution 'B' to 'A' , the pink colour disappears.
The following statement is true for solution 'A' and 'B'

Answer 1

Answer:

(c) A has pH greater than 7 and B has pH less than 7.

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Answer 2

The true statement for solution 'A' and 'B' is:

c. A has pH greater than 7 and B has pH less than 7.

- The indicator phenolphthalein works in the basic solutions.

- It means in this pH range, the solution will change its colour to pink.

- So, solution A must lie in the pH range of above 7.

- When we add a solution with pH less than 7, then the pH of the final solution will decrease.

- Phenolphthalein will not work anymore in the lower pH range and the solution becomes colourless.

- So, the pH of solution B must be less than 7.

- Hence, the correct answer is option (c).

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