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Question

Peptization of SnO2 by NaOH gives:

A
[SnO2]SnO23:2Na+
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B
[SnO2]Sn4+:O2
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C
[SnO2]Na:OH
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D
[SnO2]Sn4+:OH
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Solution

The correct option is A [SnO2]SnO23:2Na+
The dispersion of a freshly precipitated material into colloidal solution by the action of an electrolyte in solution is termed peptization. The electrolyte used is called a peptizing agent. e.g. Freshly prepared stannic oxide on treatment with a small amount of dilute hydrochloric acid forms a stable colloidal solution of stannic oxide. i.e. [SnO2]SnO23: 2Na+

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