Question 4

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are
(a) red and blue.
(b) blue and red.
(c) pink and colourless.
(d) colourless and pink

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Solution

Phenolpthalein is a man-made visual indicator used to check acidity or basicity of solutions. Phenolphthalein is colourless in an acidic solution and turns pink in a basic solution.

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Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions respectively are

\begin{matrix} A) L i t m u s & 1) B l u e i n a c i d i c, p i n k i n b a s i c s o i l s B) M e t h y l o r a n g e & 2) R e d i n a c i d i c, y e l l o w i n b a s i c s o l u t i o n s C) P h e n o l p h t h a l e i n & 3) B l u e i n b a s i c, r e d i n a c i d i c s o l u t i o n s D) C o l o u r o f H y d r a n g e a & 4) P i n k i n b a s i c, c o l o r l e s s i n a c i d i c s o l u t i o n s \end{matrix}

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