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Question

The group reagent for third group is NH4OH in presence of:

A
(NH4)2CO3
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B
NaCl
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C
(NH4)2SO4
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D
NH4Cl
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Solution

The correct option is D NH4Cl
Group 3rd ions are precipitated as hydroxides and the addition of NH4Cl suppresses the ionisation of NH4OH so that only group 3rd cations are precipitated as hydroxides because of their low solubility products.

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