The indicators which turn red in acid solution are :
(a) turmeric and litmus
(b) phenolphthalein and methyl orange
(c) litmus and methyl orange
(d) phenolphthalein and litmus
State True or False. [3 MARKS] a) Olfactory indicators respond to acid or base by change in smell. b) When an aqueous solution of shampoo is mixed with the extract of red cabbage, the solution turns pink. c) Methyl Orange is a natural Indicator.