Which of the following reactions leads to the formation of a substance in colloidal state?

(A) 2HNO3+3H2S            3S+3H2O+2NO 

(B) SnCl2+HgCl2            SnCl4+Hg 

(C) 2Mg+CO2            2MgO+C

(D) Cu+CuCl2  HCl    Cu2Cl2

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