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(b) When we add NH base 4CI, it suppresses the ionization of NH base 4OH and prevents the precipitation of higher group hydroxide in gp (III).
NOTE : Further ferric chloride and chromium chloride form different colour precipitates with NH base 4OH.
FeCI base 3 + 3NH base 4OH ? Fe(OH) base 3 ? + 3NH base 4CI
Reddish brown
CrCI base 3 + 3NH base 4OH ? Cr(OH) base 3 + 3NH base 4CI
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