Which of the following reactions leads to the formation of a substance

1.	Which of the following reactions leads to the formation of a substance in the colloidal state?
A.	\[Cu+HgC{{l}_{2}}\to CuC{{l}_{2}}+Hg\]
B.	\[2HN{{O}_{3}}+3{{H}_{2}}S\to 3S+4{{H}_{2}}O+2NO\]
C.	\[2Mg+C{{O}_{2}}\to 2MgO+C\]
D.	\[Cu+CuC{{l}_{2}}\to C{{u}_{2}}C{{l}_{2}}\]
Answer» C. \[2Mg+C{{O}_{2}}\to 2MgO+C\]

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

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