Question

in test tube A, a student took potato extract and added iodine solution. in test tube B he took dal water and hydrochloric acid. In c, he took potato and alcohol. In D he took dal and methylene blue. In which test tube will he observe a pink colour?

Answer 1

pink colour will be in test tube A.

Answer 2

Answer: B.

Explanation: The appearance of colour PINK confirms the presence of Metanil yellow in pulses.

More information :-

Metanil- 1) It is used as a pH indicator in analytical chemistry.

2)It has a color change from red to yellow between pH 1.2 and 2.3.