Home JEE Main - Previous Year Papers JEE MAIN 2018 OFFLINE PAPER An alkali is titrated against an acid with m…
JEE Main - Previous Year Papers JEE MAIN 2018 OFFLINE PAPER Single Correct MCQ
Published on: August 22, 2026

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?

Base Acid End point

A
Strong Strong Pink to colourless
B
Weak Strong Colourless to pink
C
Strong Strong Pinkish red to yellow
D
Weak Strong Yellow to pinkish red

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Text Solution

Verified by Experts
The correct answer is:
D

Methyl orange is weak organic base. It is used in the titration of WB vs SA

In basic medium, equilibrium lies in backward direction and therefore it shows yellow colour.

In acidic medium, equilibrium shifts in forward direction and therefore, colour changes from yellow to red.

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