Question

अधोलिखित पदैः पत्रम पूरात-
(भ्रमदार्थ, स्वास्थम प्रणामा
परीक्षा कुशलिनी)​

Answer 1

A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. ... Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education.