The reaction 2fe + 3cl2 → 2fecl3 is an example of which type of reaction?
combustion reaction
single-replacement reaction
combination reaction
decomposition reaction

combination reaction

Explanation:

In a combination reaction two reactants combine to form a single product, like in  this case.

Other options are incorrect because:

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.