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CGP EDU Academic Team
Published on: August 13, 2026
At pH < 3.1, the indicator methyl red is coloured red, at pH > 6.3, it is yellow and at the intermediate values of the pH, it is orange. What will the colour of indicator be in a 0.1 M solution of NH 4 Br ? Take pK b (NH 4 OH) = 4.74.
Text Solution
Verified by ExpertsThe correct answer is:
C
NH 4 Br 
Salt of SA WB
pH = 7 – 
pK b – 
log C = 7 – 
– 
log 10 –1 = 7 – 2.37 + 
= 5.13
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