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Cellulose

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The electrode potential of oxidation half cell(a) is independent of the concentration of ions in the cell (b)decreases with decreased concentration of ions in the cell (c)decreases with increased concentration of ions in the cell (d)none of these.

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Q. Assertion : In the Daniel cell, if concentration of

C u^{2 +}

Z n^{2 +}

ions are doubled, the emf of the cell will not change. Reason: If the concentration of ions in contact with the metals is doubled, the electrode potential is doubled.

Q. Assertion :In a Daniell cell, if the concentration of

C u^{2 +}

Z n^{2 +}

ions are doubled, the EMF of the cell will be doubled. Reason: If the concentration of ions in contact with metals is doubled, the electrode potential is doubled.

Q. Assertion :In the Daniell cell, if concentrations of

C u^{2 +}

Z n^{2 +}

ions are doubled, the emf of the cell will be doubled. Reason: If the concentration of ions in contact with the metals is doubled, the electrode potential is doubled.

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0.1 M

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0.422 V

Q. 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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