Other things being equal, the life of a Daniell cell may be increased by
(1) keeping temperature low
(2) using large copper electrode
(3) decreasing concentration of copper ions
(4) using zinc electrodes

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Solution

(4) using large zinc electrodes
It is the dissolving of the anode that gives up electrons that travel from one electrode through the electric load to the other electrode. Doing work for us. By lighting our flashlights. Or powering our portable radio. When the anode dissolves to the point that it cannot give up anymore electrons the chemical reaction stops. And we have to replace our batteries.

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Other things being equal, the life of a Daniell cell may be increased by (1) keeping temperature low (2) using large copper electrode (3) decreasing concentration of copper ions (4) using zinc electrodes

Other things being equal, the life of a Daniell cell may be increased by
(1) keeping temperature low
(2) using large copper electrode
(3) decreasing concentration of copper ions
(4) using zinc electrodes