# The molecularity of the reaction $6FeSO_4+3H_2SO_4+KClO_3 \longrightarrow KCl +3 Fe_2(SO_4)_3+3H_2O$ is

$(A)\;6 \\ (B)\;3 \\(C)\;10 \\(D)\;7$

The total number of reactant molecules participating in a chemical reaction is known as its molecularity .
$\qquad= 6+3+1=10$
Hence C is the correct answer.