Few drops of HNO3 are added to II group before proceedingto III group in order to :
A
Convert Fe2+ to Fe3+
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B
Convert Fe3+ to Fe2+
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C
ppt. III group
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D
None of these
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Solution
The correct option is A Convert Fe2+ to Fe3+ Option (A) is correct. Few drops of HNO3 are added to II group before proceedingto III group in order to convert Fe2+ to Fe3+. Fe2+ is oxidized to Fe3+ in order to precipitate Fe(OH)3.