Virtual Labs

Electrolytic Concentration Cell.

Q1. When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes?

a: >1 Explanation

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b: <1 Explanation

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c: = 0 Explanation

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d: Not defined Explanation

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Q2. Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?

a: NaCl Explanation

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b: KNO₃ Explanation

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c: KCl Explanation

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d: ZnSO₄ Explanation

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Q3. Which of the following factors does not affect the electrode potential of an electrode?

a: Nature of the electrode (metal) Explanation

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b: Temperature of the solution Explanation

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c: Molarity of the solution Explanation

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d: Size of the electrode Explanation

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Q4.Why are the saturated solutions of electrolytes for the salt bridge prepared in agar-agar jelly or gelatin?

a: The jelly acts as an electrolyte Explanation

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b: It helps the electrolytes to mix with the contents of the half cells Explanation

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c: It helps maintain the electrical polarity between the two half-cell solutions Explanation

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d: It keeps the electrolyte in semi-solid phase and prevents it from mixing with the two half-cell solutions Explanation

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Q5.Which of the following conditions are satisfied when the cell reaction in the electrochemical cell is spontaneous?

a: ΔG° > 0 Explanation

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b: E° < 0 Explanation

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c: E° = 0 Explanation

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d: ΔG° < 0 Explanation

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Q6.When the salt bridge is removed from a cell, its voltage?

a: will increase Explanation

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b: will decrease to half Explanation

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c: will decrease to zero Explanation

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d: will not change Explanation

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Q7.The cell constant of a conductivity cell?

a: Changes with a change of concentration of electrolyte Explanation

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b: Remains constant for a cell Explanation

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c: Changes with a change of electrolyte Explanation

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d: Changes with change in temperature Explanation

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Q8.Anodizing creates an oxide layer on the surface of a metal that is:

a: thicker than the naturally occurring oxide Explanation

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b: thinner than the naturally occurring oxide Explanation

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c: much lighter than the naturally occurring oxide Explanation

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d: a more porous surface than the naturally occurring oxide Explanation

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Q9.What is the product formed at the cathode in the electrolysis of aqueous CuSO₄?

a: Copper metal Explanation

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b: Oxygen gas Explanation

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c: Hydrogen gas Explanation

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d: Sulphur Explanation

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Q10.Electrolytic cell contains?

a: Electrolytes must have same concentration Explanation

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b: Electrolytes contains different concentration Explanation

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c: Electrode should be of varied pressure Explanation

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d: Reference electrode is used Explanation

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