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

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.

Answer 2

A charge is the property of the proton that can be positive due to protons and negative due to electrons. The charge is conserved in reaction 4. where iodine reacts with chlorine gas.

What is conservation of charge?

Conservation of charge is a principle of chemistry that states that the total electric charge of the system in an isolated system remains constant. It is conserved in the universe and does not varies.

In the first reaction between copper and silver, the charge on the reactant side is +1 while on the product side is +2. In the second reaction between magnesium and zinc, the charge on the product side is more compared to the reactant side.

Similarly, in the third reaction between fluorine and bromine reactant has a -1 charge and the product has a -2 charge. In the fourth reaction between iodine and chloride, the charges are -2 on both sides of the reaction.

Therefore, option D. in the fourth reaction $\rm 2I^{-} + Cl_{2} \rightarrow I_{2}+ 2Cl^{-}$ the charges are conserved.

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