Question

7. What colours do the following indicators develop when added to an acid?
(1) Blue litmus
(ii) Methyl orange
(iii) Phenolphthalein
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Answer 1

Explanation:

Blue litmus turns into red when reacted to acid

Methyl orange changes to yellow when reacted to acid

Phenolphthalein changes into colorless when reacted to acid

Answer 2

Answer:1) Blue litmus turns into Red colour

2) turns into Red colour

3) There will be no change

Explanation:

As acid is added to Blue litmus the colour of the blue litmus changes to Red

When acid is added to Methyl orange solution it also acquires red colour

Similarly when acid is added to phenolphthalein solution there will be no change