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Byju's Answer

Standard XII

Chemistry

Electrochemical Cells, Galvanic Cells

Assertion : I...

Question

Assertion : In the Daniel cell, if concentration of $C u^{2 +}$ and $Z n^{2 +}$ 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.

assertion is true, reason is true; reason is correct explanation for assertion.

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assertion is true, reasonis true; reasonis NOT a correct explanation for assertion.

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assertion is true, reasonis false

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assertion is false, reason is true

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Solution

The correct option is C
assertion is true, reasonis false

As we know,
For Daniell cell,
if the concentration of $C u^{2 +}$ and $Z n^{2 +}$ ions are doubled, the $E M F$ of the cell will be the same according to the equation.

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Similar questions

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

C u^{2 +}

and

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 +}

and

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.

Assertion: If $a \neq b$ , then $(a, b) \neq (b, a)$ .
Reason: $(4, - 3)$ lies in Quadrant $I V$
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion : Chlorine is absorbed as

C l^{-}

ions. Its precise role is not well known. However with Na+ and K+, it help in determining solute concentration and anion-cation balance in cells.

Reason : Chlorine plays an important role in photosynthesis and takes part in the water splitting reaction, thus releasing

O_{2}

Q. Assertion: A cyclic parallelogram is a square.
Reason: Diameter is the largest chord in a circle.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

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Assertion : In the Daniel cell, if concentration of Cu2+ and Zn2+ 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.

assertion is true, reason is true; reason is correct explanation for assertion.

assertion is true, reasonis true; reasonis NOT a correct explanation for assertion.

assertion is true, reasonis false

assertion is false, reason is true

The correct option is C assertion is true, reasonis falseAs we know,For Daniell cell,if the concentration of Cu2+ and Zn2+ ions are doubled, the EMF of the cell will be the same according to the equation.

assertion is true, reasonis false

Assertion : In the Daniel cell, if concentration of $C u^{2 +}$ and $Z n^{2 +}$ 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.

The correct option is C
assertion is true, reasonis false

As we know,
For Daniell cell,
if the concentration of $C u^{2 +}$ and $Z n^{2 +}$ ions are doubled, the $E M F$ of the cell will be the same according to the equation.