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Chapter 7: Problem 40

Identify the false statement among the following: (a) Oxidation takes place at positive electrode in electrolytic cell, whereas reduction at negative electrode in voltaic cell. (b) Deposition of metals takes place in both electrolytic and galvanic cells. (c) Direction of flow of current is from cathode to anode in electrolytic cell. (d) Both (a) and (b)

Short Answer

Expert verified
a) Oxidation occurs at the anode, and reduction occurs at the cathode. b) Deposition of metals can occur on the electrodes. c) Direction of flow of current is from cathode to anode. d) Both (a) and (b) are false. Answer: c) Direction of flow of current is from cathode to anode.

Step by step solution

01

Statement (a) Analysis

Oxidation occurs when a substance loses electrons, and reduction occurs when a substance gains electrons. In an electrolytic cell, the positive electrode (anode) is where oxidation takes place, and the negative electrode (cathode) is where reduction takes place. In a voltaic (galvanic) cell, the reverse is true: oxidation takes place at the negative electrode (anode), and reduction takes place at the positive electrode (cathode). Thus, statement (a) is true.
02

Statement (b) Analysis

In both electrolytic and galvanic cells, deposition of metals can occur. In an electrolytic cell, deposition of metals occurs during the reduction process at the cathode. In a voltaic cell, the deposition can occur at the cathode as well during the reduction process. Therefore, statement (b) is also true.
03

Statement (c) Analysis

The direction of flow of current is defined as the direction in which positive charge moves. In an electrolytic cell, positive ions move towards the cathode (negative electrode) to be reduced, and negative ions move towards the anode (positive electrode) to be oxidized. Therefore, the direction of flow of current is from the positive electrode (anode) to the negative electrode (cathode). Hence, statement (c) is false.
04

Statement (d) Analysis

Statement (d) claims that both (a) and (b) are false. We have already explained that statement (a) is true and statement (b) is true, so statement (d) is also false.
05

Conclusion

Among the given statements, the false statement is (c) Direction of flow of current is from cathode to anode in the electrolytic cell.

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Most popular questions from this chapter

The standard electrode potentials of the electrodes are given below. Arrange them in decreasing order of ease of oxidation. (1) Electrode \(-\mathrm{I}, \mathrm{E}^{\circ}=-2.89 \mathrm{~V}\) (2) Electrode - II, E \(^{\circ}=-0.16 \mathrm{~V}\) (3) Electrode \(-\mathrm{III}, \mathrm{E}^{\circ}=0.77 \mathrm{~V}\) (4) Electrode \(-\mathrm{IV}, \mathrm{E}^{\circ}=-2.93 \mathrm{~V}\) (5) Electrode \(-\mathrm{V}, \mathrm{E}^{\circ}=-1.67 \mathrm{~V}\) (a) 32514 (b) 41523 (c) 35142 (d) 32145

On increasing temperature, conduction in metallic conductors. (a) increases (b) decreases (c) remains constant (d) none of these

State whether the following statements are true or false. The negative sign of the reduction potential indicates that reduction occurs at that electrode when connected to the standard hydrogen electrode.

Assertion (A): Passage of 48,250 coulombs of electricity through cupric sulphate and ferrous sulphate solutions result in the deposition \(0.5\) moles each of iron and copper at the respective cathodes. Reason (R): Number of equivalents of a metal deposited at cathode is equal to the number of faradays of electricity passed through the electrolyte. (a) Both "A" and "R" are true and "R" is the correct explanation of "A". (b) Both "A" and "R" are true and "R" is not the correct explanation of "A". (c) "A" is correct and "R" is wrong. (d) "A" is wrong and "R" is correct.

Negative sign in the standard electrode potential indicates (a) greater ease of oxidation compared to that of hydrogen (b) greater ease of reduction compared to that of hydrogen (c) lesser ease of oxidation compared to that of hydrogen (d) none of the above
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