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Chapter 21: Q21.74P (page 922)

What is the direction of electron flow with respect to the anode and the cathode in a battery? Explain.

Short Answer

Expert verified

The direction of electron flow is from anode to cathode

Step by step solution

01

What is a Battery?

When some voltaic cells are connected in series, it forms a battery. The voltaic cells are arranged in series so that the overall potential of the battery is the sum of the potential of the individual batteries.

02

Working of a battery

Since a battery is a collection of voltaic cell, the working principle of battery is similar to voltaic cell. Therefore a battery also has two electrodes- cathode and anode.

Oxidation occurs at anode. Thus the electrons liberated during oxidation flows through an external wire to the cathode where the electrons are accepted by the ion present in the solution to undergo reduction.

Thus in a battery, electrons flow from anode to cathode.

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Most popular questions from this chapter

A current is applied to two electrolytic cells in series. In the first, silver is deposited; in the second, a zinc electrode is consumed. How much Ag is plated out if 1.2 g of Zn dissolves?

Balance each skeleton reaction, calculateE°cell, and state whether the reaction is spontaneous:

(a)role="math" localid="1663418747793" Cl2(g) + Fe2 +(aq) Cl-(aq) + Fe3 +(aq)

(b)role="math" localid="1663418761168" Mn2 +(aq) + Co3 +(aq) MnO2(s) + Co2 +(aq)[acidic]

(c) AgCl(s) + NO(g) Ag(s) + Cl-(aq) + NO3-(aq)[acidic]

A voltaic cell consists of Cr/Cr3 and Cd/Cd2 half-cells with all components in their standard states. Afterminutes of operation, a thin coating of cadmium metal has plated out on the cathode. Describe what will happen if you attach the negative terminal of a dry cell (V) to the cell cathode and the positive terminal to the cell anode.

When metal A is placed in a solution of a salt of metal B, the surface of metal A changes colour. When metal B is placed in acid solution, gas bubbles form on the surface of the metal. When metal A is placed in a solution of a salt of metal C, no change is observed in the solution or on the metal A surface. Will metal C cause formation of H2when placed in acid solution? Rank metals A, B, and C in order of decreasing reducing strength

Why are E half-cell values for the oxidation and reduction of water different from E° half-cell values for the same processes? In an aqueous electrolytic cell, nitrate ions never react at the anode, but nitrite ions do. Explain.
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