An unknown solution turns red when an acid-base indicator is mixed with it. Which of the given options shows the indicator and nature of the solution, respectively?

(A) Phenolphthalein; Acid
(B) Methyl orange; Acid
(C) Methyl orange; Base
(D) Phenolphthalein; Base

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Solution

The correct option is B.
Acid-base indicators show color changes upon mixing with acids and bases according to their pH.
Phenolphthalein is colorless under acidic and neutral conditions but turns pink in the basic solution.
Methyl orange is red under acidic conditions and yellow under basic conditions. The solution turned red upon adding the indicator. So, the right option is $B$ .

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Similar questions

Q. The indicators which turn red in acid solution are:
(a) turmeric and litmus
(b) phenolphthalein and methyl orange
(c) litmus and methyl orange
(d) phenolphthalein and litmus

Q. Mention the colour changes observed when the following indicators are added to acids:
(a) Alkaline phenolphthalein solution.
(b) Methyl orange solution.
(c) Neutral litmus solution.

Q. Which of the following is not an acid-base indicator?

(a) blue litmus
(b) methyl orange
(c) phenolphthalein
(d) Digene

State True or False. [3 MARKS]

a) Olfactory indicators respond to acid or base by change in smell.
b) When an aqueous solution of shampoo is mixed with the extract of red cabbage, the solution turns pink.
c) Methyl Orange is a natural Indicator.

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.

(b) Name an acid-base indicator extracted from lichen.

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An unknown solution turns red when an acid-base indicator is mixed with it. Which of the given options shows the indicator and nature of the solution, respectively? (A) Phenolphthalein; Acid (B) Methyl orange; Acid (C) Methyl orange; Base (D) Phenolphthalein; Base​

An unknown solution turns red when an acid-base indicator is mixed with it. Which of the given options shows the indicator and nature of the solution, respectively?

(A) Phenolphthalein; Acid
(B) Methyl orange; Acid
(C) Methyl orange; Base
(D) Phenolphthalein; Base