Out of the following, which reaction giv...

Out of the following, which reaction gives rise to a colloidal sol:

A

`Cu+Hgcl_(2) to CuCl_(2) +Hg`

B

`2HNO_(3)+3H_(2)S to 3S+4H_(2)O+2NO`

C

`2Mg+CO_(2) to 2MgO+C`

D

`Cu+CuCl_(2) underset("in presence of excess of HCl") to Cu_(2)Cl_(2)`

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The correct Answer is:

B

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