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Q.

Methylene blue is an indicator widely used in acid-base titration, it is formed on mixing :

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a

${Na}_{S} {SO}_{3}$

b

${Na}_{S} S$

c

${Fe}_{2} ({SO}_{4})_{3}$

d

${FeSO}_{4}$

answer is B, C.

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Detailed Solution

$C_{8} H_{12} N_{2}$ and ${Na}_{2} S$ in mixing with methylene blue is an indicator which is widely used in acid-base titration.

Hence, the correct option is b, c.

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Methylene blue is an indicator widely used in acid-base titration, it is formed on mixing :