Question

litmus is______ indicator
​

Answer 1

$\huge\bold\red{Answer}$

litmus is pH indicator

Answer 2

Litmus turns red in acidic solutions and blue in alkaline solutions and is the oldest and most commonly used indicator of whether a substance is an acid or a base. Treatment of the lichens with ammonia, potash, and lime in the presence of air produces the various coloured components of litmus.