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Q.

A few drops of methyl orange is added to 2 × 10^–5M HCl solution. Then the colour of the resulting solution is

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a

Red

b

Yellow

c

Blue

d

Green

answer is B.

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Detailed Solution

P^H of 2 x 10^-5 M HCl solution = 5 - log 2= 4.7

For methyl orange indicator,

P^H : 3.3 - 4.4

← →

red yellow

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A few drops of methyl orange is added to 2 × 10–5M HCl solution. Then the colour of the resulting solution is