Chemistry In Everyday Life Question 87
Which one is an acidic dye
[DCE 1996]
Options:
A) Methyl orange
B) Methyl red
C) Phenolphthalein
D) All of these are correct.
Show Answer
Answer:
Correct Answer: A
Solution:
Acid dyes are characterised by the presence of -COOH, $ -SO_3H $ or Phenolic group. They are applied in the presence of acidic solution. They are usually applied to Wool, Silk, Nylon. They do not have affinity for cotton. Common examples are Orange I, Orange II, Methyl red etc.
BETA
