Chemical Effects of Current - 2 (Class X) Online Test

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Chemical Effects of Current - 2 (Class X)

Description: Chemical Effects of Current - 2
Number of Questions: 15
Created by: Shankara Prabhu
Tags: Chemical Effects of Current - 2 Electroplating Electrolysis Electrochemical Cell and Dry Cell Laws of Faraday

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Two faradays of electric current can produce

20 g of calcium from calcium sulphate
81 g of aluminium from aluminium oxide
48 g of magnesium from magnesium chloride
2 g of hydrogen gas from aqueous hydrogen chloride
35.5 g of chlorine gas from aqueous hydrogen chloride

One faraday is equal to

69,500 coulombs
91,500 coulombs
91,400 coulombs
96,500 coulombs

Faraday’s laws of electrolysis are related to the

atomic number of the cation
atomic number of the anion
equivalent weight of the electrolyte
speed of the cation

According to Faraday’s first law, the amount of substance deposited at electrode when an electric current is passed through an electrolyte depends upon the

(a) amount of current passed (b) dissociation of electrolyte (c) time till which current is passed (d) nature of electrode material

Both (a) and (b)
Both (b) and (c)
Both (a) and (c)
Both (c) and (d)

What do you mean by electroplating?

(a) The process of decomposition of any desired metal into another metal by means of electricity (b) The process of decomposition of any desired metal into another metal by means of physical reaction (c) The process of depositing a layer of any desired metal on another material by means of electricity

Only (a)
Only (b)
Only (c)
Both (a) and (b)

During electroplating, when current is passed through a copper sulphate solution, copper gets deposited on the

electrode which is attached to the negative terminal of the battery
electrode which is attached to the positive terminal of the battery
walls of the vessel
bottom of the vessel

Why is electroplating done on metallic objects?

To make the metal reactive
To make the appearance of the metal dull
To change the composition of the metal
To protect the metal underneath and to make it attractive

Electroplating is mostly done on

gold
chromium
zinc
iron

Why is chromium used for electroplating?

(a) It does not corrode. (b) It is scratch resistant. (c) It is cheap, easily available and can be electroplated very easily.

Only (a)
Both (a) and (b)
Only (c)
Both (b) and (c)

An electric dry cell has _____ on one side.

metal disc
metal wire
plastic base
filament

Which of the following statements is true about electrochemical cells?

Oxidation takes place at cathode and reduction takes place at anode.
Cathode is negative and anode is positive.
Electrons flow from anode to cathode in the external circuit.
Electrical energy is converted into chemical energy.

For the process of electrolysis of water, which of the following statements is true?

Oxygen bubbles will be formed on positive electrode and hydrogen bubbles will be formed on negative electrode.
Oxygen bubbles will be formed on negative electrode and hydrogen bubbles will be formed on positive electrode.
Oxygen and hydrogen bubbles will be formed on positive electrode only.
Oxygen and hydrogen bubbles will be formed on negative electrode only.

A test lamp glows while testing the conductivity of a liquid. What does it show?

It shows that electric current can never pass through liquids.
It shows that the liquid is distilled water.
It shows that electric current can pass through liquids.
It shows that the circuit is incomplete.

The mass of a product liberated at anode in an electrochemical cell depends on

(It)^1/2
It
I/t
I²t

If we cut out a piece of potato and insert copper wire of a tester into it, what effect will be observed?

A red spot is formed on one terminal of the wire.
A greenish-blue spot is formed on one terminal of the wire.
A bluish-black spot is formed on one terminal of the wire.
A greenish-blue spot is formed on both terminals of the wire.

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Chemical Effects of Current - 2 (Class X)

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