The ion most difficult to remove as a precipitate is :

{A g}^{+}

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{N H}_{4}^{+}

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{F e}^{3 +}

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{C u}^{2 +}

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Solution

The correct option is B ${N H}_{4}^{+}$
${N H}_{4}^{+}$ ion most difficult to remove as a precipitate whereas ${A g}^{+}$ , ${F e}^{3 +}$ and ${C u}^{2 +}$ ions can be easily removed as precipitate.

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