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To avoid the precipitation of Hydroxides of $Z n^{2 +}, M n^{2 +}$ and $N i^{2 +}$ along with those of $F e^{3 +}$ , $A l^{3 +}$ and $C r^{3 +}$ the third group solution should be :

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Concentrated $H N O_{3}$ is added

Treated with excess of $N H_{4} C l$

Concentrated $H_{2} S O_{4}$ is added

Treated with excess of $N H_{4} O H$

answer is B.

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The third group solution should be treated with excess of $N H_{4} C l$

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