Name an indicator which is red in acid solution but turn blue in basis solution.

1 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

2 What colour do following indicators turn when added to an acid (hydrochloric acid)?

(a) litmus

(b) methyl orange

4 Name an indicator which is pink in alkaline solution but turns colourless in acidic solution. 5 When a solution is added to a cloth strip treated with onion extract, then the smell of onion cannot be detected. State whether the given solution contains an acid or a base.