Respuesta :

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Answer:

Hydrogen and chlorine.

Explanation:

The balanced chemical equation is

CH₄ + 2Cl₂ ⟶CCl₄ + 4HCl

Two elements in the equation have the subscript 4.

The element H (hydrogen) in CH₄ is one of them.

The element Cl (chlorine) in CCl₄ is the other.