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The As2S3 colloid will be most readily c...

The `As_2S_3` colloid will be most readily coagulated by

A

`MgCl_2`

B

`AlCl_3`

C

`Na_2SO_4`

D

`Na_3PO_4`

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The correct Answer is:
B
`As_2S_3` colloidal particles carry negative charge and are coagulated by positively charge ions, higher the positive charge , more readily the coagulation takes place . Among the given compounds the cation with the highest positive charge is given by `AlCl_3 [ AlCl_3 harr Al^(3)+3Cl^-]`
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