Science, asked by Khushikanyal13, 11 months ago

1. 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'.
(a) A is strongly basic and B is a weak base.
(b) A is strongly acidic and B is a weak acid.
(c) A has pH greater than 7 and B has pH less than 7.
(d) A has pH less than 7 and B has pH greater than 7.​

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Answers

Answered by sahil873067
22

Answer:

option (c) is correct answer

Answered by dreamrob
3

Answer : Option (c) is correct. A has pH greater than 7 and B has pH less than 7.

Explanation :

Natural color of phenolphthalein is colorless.

In acidic medium phenolphthalein remains colorless.

In alkaline medium phenolphthalein turns pink.

pH of alkaline solution is greater than 7. (pH > 7)

pH of acidic solution is less than 7. (pH < 7)

A + Phenolphthalein → Pink               (A : Base)          (pH > 7)

B + Phenolphthalein → Colorless       (B : Acid)           (pH < 7)

Therefore, A has pH greater than 7 and B has pH less than 7.

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