Question

Which equation shows conservation of charge?cu + ag+ → cu2+ + ag mg + zn2+ → 2mg2+ + zn 2f2 + br– → 2f– + br2 2i– + cl2 → i2 + 2cl–?

Answer 1

The first conversion charge

Answer 2

Answer: Reaction (4)

Conservation of charge means net charge of the system is same. If in a chemical equation, charge on the reactant side is same as that on the product side, it shows the conservation of charge.

The given reactions are as follows:

$(1) Cu+Ag^{+}\rightarrow Cu^{2+}+Ag$

$(2) Mg+Zn^{2+}\rightarrow 2Mg^{2+}+Zn$

$(3)2F_{2}+Br^{-}\rightarrow 2Mg^{2+}+Zn$

$(4) 2I^{-}+Cl_{2}\rightarrow I_{2}+2Cl^{-}$

In reaction (1), charge on reactant side is +1 and that on product side is +2 thus, it does not show conservation of charge.

In reaction (2), charge on reactant side is +2 and that on product side is +4 thus, it does not show conservation of charge.

In reaction (3), charge on reactant side is -1 and that on product side is -2 thus, it does not show conservation of charge.

In reaction (4), charge on reactant side is -2 and on product side is also -2 thus, it shows conservation of charge.

Therefore, reaction (4) is correct answer.