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Q.

In the precipitation of the iron group in qualitative anlaysis, ammonium chloride is added before adding ammonium hydroxide to:

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a

Decrease concentration of OH⊖ ions

b

Prevent interference by phosphate ions

c

Increase concentration of ClΘ ions

d

Increase concentration of NH4⊕ ions

answer is A.

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Detailed Solution

Only Fe, Cr and Al are precipitated as their hydroxides
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