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Q.

Few drops of HNO₃ are added to group II before proceeding to group III in order to:

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a

$Convert {Fe}^{3 +} to {Fe}^{2 +}$

b

$Convert {Fe}^{2 +} to {Fe}^{3 +}$

c

ppt. group III

d

None of these

answer is A.

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Detailed Solution

${Fe}^{2 +} is oxidised to {Fe}^{3 +} in order to precipitate Fe (OH)_{3} .$

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