Question

State whether the following statements are true or false. Correct the false statements.
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red.
(c) Lime water turns red litmus blue.
(d) Common salt dissolved in water turns blue litmus red.
(e) Phenolphthalein is a natural indicator.
(f) Calamine can be used to treat ant’s sting.
(g) Lemon water is basic in nature.

Answer 1

(a) False. Substances can be neutral as well.
(b) False. Acids do not turn all indicators red.
(c) True
(d) False. It does not change the colour of litmus at all.
(e) False. It is a man-made indicator.
(f) True
(g) False. It is acidic in nature.