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Question

One drop of methyl orange solution when added to the solution obtained after electrolysis of a concentrated solution of NaCl with Pt electrodes, the colour of the solution will turn:

A
orange
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B
pink
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C
yellow
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D
colourless
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Solution

The correct option is B yellow
Methyl orange is a pH indicator used in titrations because of its clear and distinct colour change. It shows red colour in acidic and yellow colour in basic medium.

Electrolysis of brine or sodium chloride solution produces sodium hydroxide, NaOH which is a strong base. Using methyl orange as an indicator gives a yellow colour solution for NaOH.

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