What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
(a) methyl orange
(b) litmus
(c) red cabbage extract

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Solution

(a) Methyl orange: Methyl orange changes its colour to yellow when added to a base or an alkali.
(b) Litmus paper: Red litmus paper turns blue, whereas blue litmus paper remains blue in a base or an alkali.
(c) Red cabbage extract: Red cabbage extract turns greenish-yellow in basic solutions.

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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.

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.

What will be the colour change when methyl orange is added to sodium hydroxide?

The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(d) phenolphthalein and litmus

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What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)? (a) methyl orange (b) litmus (c) red cabbage extract

(a) Methyl orange: Methyl orange changes its colour to yellow when added to a base or an alkali. (b) Litmus paper: Red litmus paper turns blue, whereas blue litmus paper remains blue in a base or an alkali. (c) Red cabbage extract: Red cabbage extract turns greenish-yellow in basic solutions.

What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
(a) methyl orange
(b) litmus
(c) red cabbage extract

(a) Methyl orange: Methyl orange changes its colour to yellow when added to a base or an alkali.
(b) Litmus paper: Red litmus paper turns blue, whereas blue litmus paper remains blue in a base or an alkali.
(c) Red cabbage extract: Red cabbage extract turns greenish-yellow in basic solutions.