Which of the following is incorrectly matched?

Indicator Colour change in basic medium

(1) Litmus paper Red to blue

(2) Methyl orange Orange to red

(3) Phenolphthalein Colourless to pink

(4) Turmeric Yellow to reddish brown

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Solution

Methyl orange is a synthetic indicator used to distinguish between acids and bases. It changes its colour to red in an acidic medium and yellow in a basic medium.

Hence, the correct answer is option (b).

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Similar questions

	Indicator	Colour change in basic medium
(1)	Litmus paper	Red to blue
(2)	Methyl orange	Orange to red
(3)	Phenolphthalein	Colourless to pink
(4)	Turmeric	Yellow to reddish brown

\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}

The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(d) phenolphthalein and litmus

\begin{matrix} a) Litmus & 1) Blue in acidic, pink in basic soils b) Methyl orange & 2) Red in acidic, yellow in basic solutions c) Phenolphthalein & 3) Blue in basic, red in acidic solutions d) Color of Hydrangea & 4) Pink in basic, colorless in acidic solutions \end{matrix}

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