Assertion: Ions of elements which occur at lower positions at electrochemical series are discharged first from a solution.
Reason: According to the preferential discharge theory, out of a number of ions, the one which requires least energy will be liberated first at a given substance.

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

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Assertion is true but Reason is false

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Assertion is false but Reason is true

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Both Assertion and Reason are false

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Solution

The correct option is B Both Assertion and Reason are true and Reason is the correct explanation of Assertion
According to this theory, if more than one type of ion is attracted towards a particular electrode, then the ion discharged is the one which requires the least energy or with lower discharge potential or which occurs lower in the electrochemical series.

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Assertion: Ions of elements which occur at lower positions at electrochemical series are discharged first from a solution.Reason: According to the preferential discharge theory, out of a number of ions, the one which requires least energy will be liberated first at a given substance.

Assertion: Ions of elements which occur at lower positions at electrochemical series are discharged first from a solution.
Reason: According to the preferential discharge theory, out of a number of ions, the one which requires least energy will be liberated first at a given substance.