Ashish took 4 test tubes $P, Q, R$ and $S$ each containing $10$ ml of different solutions as shown in the figure. Few drops of methyl orange are added to each tube. The solution in which tube will turn methyl orange to red?

P

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Q

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R

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S

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Solution

The correct options are
A $P$
D $S$
Methyl orange change to red in colour in presence of acid.

Methyl Orange is an acid-base indicator. An acid-base indicator is a substance which changes its color or loses its characteristic smell (odor based indicators) in acidic or basic medium.

Orange juice is acidic as it has citric acid and sour milk contain lactic acid hence turns methyl orange to red.

Hence,option A and D are correct.

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Ashish took 4 test tubes P, Q, R and S each containing 10 ml of different solutions as shown in the figure. Few drops of methyl orange are added to each tube. The solution in which tube will turn methyl orange to red?

Ashish took 4 test tubes $P, Q, R$ and $S$ each containing $10$ ml of different solutions as shown in the figure. Few drops of methyl orange are added to each tube. The solution in which tube will turn methyl orange to red?