Question

(c) An unknown indicator turns green in sodium hydroxide solution. Name the indicator.
Also tell what colour does it show in an acidic solution.
ad Nistinguish hetween natural acids and mineral acids. Give examples of each.​

Answer 1

Answer:

Ans: Red Cabbage juice indicator turns green colour in presence of NaOH. It turns red (pink) in presence of acid solutions.

Answer 2

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$\small {\pink {\underline {\bf {given :-}}}}$

An indicator turns green in sodium hydroxide solution.

$\small {\pink {\underline {\bf {to \: find :-}}}}$

1. Name of the indicator
2. Behaviour of the indicator in acidic solution.
3. Difference between natural and mineral acids.

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1. Red cabbage juice is the indicator which turns green in the presence of NaOH solution.
2. The indicator will turn red(pink) in a acidic solution.
3. Natural :- The acids which are present naturally are known as natural acids. For example, citric acid present in citric fruits and malic acids present in apple.
4. Mineral :- The acids which are extracted from rocks and minerals are known as mineral acids. For example, hydrochloric acid, nitric acid and sulphuric acid.

$\small {\pink {\underline {\bf {more \: to \: know :-}}}}$

• .Red cabbage juice is considered to be an indicator because it contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base.
• HCl being a mineral acid is also found in our stomach.

Thank You