Electrochemistry Test

Result

Electrochemistry Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Why is KCl used in a salt bridge?

A
Because velocity of K⁺ is greater than Cl^-

B
Because velocity of K⁺ is less than Cl^-

C
Because velocities of K⁺ and Cl^- are nearly equal

D
Because KCl is soluble in water

Solution

KCl is used in a salt bridge because velocities of K⁺ and Cl^- are nearly equal.
Question 2
1 / -0

In an electrolytic cell, which of the following statements is not true?

A
Cathode is the negative terminal.

B
Cathode is the positive terminal.

C
Reduction occurs at the cathode.

D
Oxidation occurs at the anode.

Solution

An electrolytic cell is a device that causes a redox reaction (which is otherwise non-spontaneous) to occur when electrical energy is applied.
An electrolytic cell has three component parts - an electrolyte and two electrodes (a cathode and an anode).
In this, cathode is the negative terminal and it attracts positively-charged cations, and reduction occurs at the cathode.
Anode is the positive terminal and it attracts negatively-charged anions, and oxidation occurs at the anode.
Question 3
1 / -0

When electric current is passed through a cell having an electrolyte, the cations move towards the cathode and the anions towards the anode. If cathode is pulled out of the solution, then

A
the cations and anions will move towards the anode

B
the cations will start moving towards the anode, while the anions will stop moving

C
the anions will continue to move towards the anode and the cations will stop moving.

D
the cations and anions will start moving randomly.

Solution

When cathode is pulled out of the solution, in absence of current, the cations and anions move randomly in the solution and there is no net flow of charge in any direction.