Difficult
Which of the following reactions leads to the formation of a substance in the colloidal state (in the presence of excess of $HCl$)?
- A$Cu + HgCl_2 \to CuCl_2 + Hg$
- B$2HNO_3 + 3H_2S \to 3S + 4H_2O + 2NO$
- C$2Mg + CO_2 \to 2MgO + C$
- D$Cu + CuCl_2 \to Cu_2Cl_2$
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