Indicators | Litmus Paper

Quick Revision|What Is An Acid - Base Indicator ?|Types Of Indicator| Litmus|Turmeric|OMR|Previous Year Questions

Assertion (A): Ammonia solution is an alkali. Reason (R ): Ammonia solution turns blue litmus paper red.

A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the color of litmus paper