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Effect on Indicators by Acids and Bases

The indicator...

Question

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

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Solution

(c) litmus and methyl orange

Litmus and methyl orange turn red in an acid solution.

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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. Lime juice will turn

(a) blue litmus red
(b) methyl orange yellow
(c) red litmus blue
(d) phenolphthalein pink

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

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

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 one of the following is not used as a indicator?

(a) Vinegar
(b) Litmus
(c) Phenolphthalein
(d) Methyl orange

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