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Question

Which of the following colloids can be coagulated by Al3+?

A
Haemoglobin.
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B
TiO2
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C
As2S3
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D
CdS
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Solution

The correct options are
C As2S3
D CdS
Al3+ is positively charged. Positively charged ion can coagulate negatively charged colloids.
Out of the given options As2S3 and CdS are negatively charged colloids.

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