Which reaction gives colloidal solution...

Which reaction gives colloidal solution

A

`Cu+HgCl_(2)rarr CuCl_(2)+Hg`

B

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

C

`2Mg+CO_(2)rarr2MgO+C`

D

`Cu+CuCl_(2)rarrCu_(2)Cl_(2)`

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The correct Answer is:

B

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