Which of the following cations will have minimum flocculation value for arsenic sulphide solution?

{N a}^{+}

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{M g}^{2 +}

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{C a}^{2 +}

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{A l}^{3 +}

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Solution

The correct option is D ${A l}^{3 +}$
According to Hardy Schulze law, flocculation value will be minimum for the ion having more charge. Hence, $A l^{3 +}$ will have minimum flocculation value.

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