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
Answers
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(C) A has pH greater than 7 and B has pH less than 7
Answered by
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Answer:
(C) A has pH greater than 7 and B has pH less than 7
Reason:
Phenolphthalein is a synthetic indicator which turns Pink for bases and colourless for acids
Rejections:
(A) We will reject A because we don't know exact concentration of H+ ions and OH- ions
(B) We will reject B because of the same reason as A
(D) The statement is wrong
Hence option (C) is correct
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