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How do we differentiate between Fe^3+ and Cr^3+ in group III? a. by taking excess of NH base 4OH solution b. by increasing NH base 4^+ ion concentration c. by decreasing OH^- ion concentration d. both (b) and (c)

How do we differentiate between Fe^3+ and Cr^3+ in group III?
a. by taking excess of NH base 4OH solution
b. by increasing NH base 4^+ ion concentration
c. by decreasing OH^- ion concentration
d. both (b) and (c)

Grade:6

1 Answers

Jitender Pal
askIITians Faculty 365 Points
6 years ago

(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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