Question

1
2.
Name three organic and three inorganic acids.
What are indicators ? Name any three indicators and state the colour change
which takes place in (i) acids (ii) bases.

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Answer 1

Answer:

organic acid : lemon( citric acid), vinegar ( acetic acid), tomato(oxalic acid).

inorganic acid: sulphuric acid, hydrochloric acid, nitric acid.

Indicators are the substance which indicates whether the given substance is acidic or basic.

Indicators 1) litmus paper : turns red litmus blue when substance is basic and, turns blue litmus red when substance is acidic.

2) phenolphthalein : turns colourless when substance is acidic and , turns pink when substance is basic.

3) methyl orange : turns red when substance is acidic and , turns yellow when substance is basic.

Answer 2

Explanation:

lactic acid, Malic acid, citric acid are three organic acids

hydrochloric acid , sulphuric acid, nitric acid are three inorganic acid .

methyl red : acids in red and bases in yellow colour.

litmus : acids in red and bases in blue colour.

Bromocresol green: acids in yellow and bases in blue colour .