Which equation shows conservation of both mass and charge?
(1) Cl2 + Br→ Cl- + Br,
(2) Cu + 2 Agt → Cu2+ + Ag
(3) Zn + Cr3+ → Zn2+ + Cr
(4) Ni + Pb2+ → Ni2+ + Pb

Conservation of mass: there is the same mass, i.e. same number of atoms, in the reactants and in the products.
Conservation of charge: there is the same electrical charge in the reactants and in the products.

Which equation shows conservation of both mass and charge?

(1) Cl₂ + Br → Cl⁻ + Br

No, the equation does not show conservation of mass nor charge.

(2) Cu + 2 Ag⁺ → Cu²⁺ + Ag

No, the equation does not show conservation of mass.

(3) Zn + Cr³⁺ → Zn²⁺ + Cr

No, the equation does not show conservation of charge.

(4) Ni + Pb²⁺ → Ni²⁺ + Pb

Yes, the equation show conservation of mass and charge.

The equation that shows conservation of both mass and charge is:

(4) Ni + Pb²⁺ → Ni²⁺ + Pb

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Which equation shows conservation of both mass and charge? (1) Cl2 + Br→ Cl- + Br, (2) Cu + 2 Agt → Cu2+ + Ag (3) Zn + Cr3+ → Zn2+ + Cr(4) Ni + Pb2+ → Ni2+ + Pb ​