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Which of the following reaction gives a ...

Which of the following reaction gives a colloidal sol ?

A

`MgCO_3 rarr MgO + CO_2`

B

`2Na + 2H_2O rarr 2NaOH + H_2`

C

`2HNO_3+3H_2S rarr 3S+4 H_2O+2NO`

D

`Cu+ CuCl_2 rarr Cu_2Cl_2` .

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