Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 9

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Question 1
1 / -0

Cans used for storing food are electroplated. What is the material used for electroplating?

A
Chrome onto tin

B
Iron onto tin

C
Tin onto iron

D
Chrome onto iron

Solution

Tin, being less reactive than iron, is used for coating cans meant for storing food items.
Question 2
1 / -0

What is iron coated with in order to protect it from corrosion and rust?

A
Tin

B
Copper

C
Zinc

D
Mercury

Solution

To protect iron from corrosion and rust, it is coated with zinc.
Question 3
1 / -0

Why is zinc better than tin for electro- plating a piece of iron in order to prevent it from rusting?

A
Zinc is cheaper than tin.

B
Tin is toxic.

C
Zinc can prevent iron from coming into contact with water and air.

D
Rusting is prevented even when the zinc layer is broken.

Solution

Zinc can be better than tin for protecting iron from rusting because, zinc being highly electropositive can prevent rusting even when the layer is broken.
Question 4
1 / -0

Which of the following statements is correct?

A
Distilled water is a good conductor of electricity.

B
An LED glows even when a weak electric current flows through it.

C
Only hydrated salt solutions conduct electricity.

D
Zinc plating is done to make the object scratch proof.

Solution

An LED glows even when a weak electric current flows through it.
Question 5
1 / -0

?X? is a good conductor of electricity. Which of the following could be ?X??

A
Solid sodium chloride

B
Vinegar

C
Distilled water

D
Liquid oxygen

Solution

Vinegar is a good conductor of electricity. Hence, X is vinegar.
Question 6
1 / -0

In a cell, by convention, from where does the charge seem to be flowing through?

A
From positive electrode to negative electrode

B
From negative electrode to positive electrode

C
Both (A) and (B)

D
Cannot be said

Solution

In a cell, by convention, charge is taken to be flowing from positive electrode to negative electrode.
Question 7
1 / -0

Why are metals good conductors of electricity?

A
In metals/outer electrons are strongly bound to the atom.

B
In metals, outer electrons are loosely bound to the atom.

C
In metals, inner electrons are loosely bound to the atom.

D
In metals, protons can detach from the nucleus and conduct electricity.

Solution

In metals, the attractive force on outermost electrons towards nucleus is feeble due to which they become free from atom when they get a little energy from outside. Such electrons are free to move anywhere inside the metal, but they are not free to move outside the metal.
Question 8
1 / -0

Why are cans used for storing soft drinks or food items usually electroplated with tin?

A
Tin is less reactive than the metal the can is made of.

B
Tin is cheap.

C
Tin is strong and shiny in appearance

D
Tin is lighter than other metals.

Solution

Cans used for storing soft drinks or food items are usually electroplated with tin because tin is less reactive than the base metal with which the can is made of. Tin does not contaminate the food or soft drink. It also does not get corroded.
Question 9
1 / -0

A During the electrolysis of CuSO₄ solution, sulphate ions move towards the

A
copper electrode.

B
anode.

C
cathode.

D
zinc electrode.

Solution

Anions move towards anode as they are negatively charged.
Question 10
1 / -0

A bulb does not glow when the probe are hanging in air. Why?

A
Air absorbs electricity.

B
Air is a bad conductor of electricity.

C
Electricity is discharged into air.

D
Air disperses electricity.

Solution

A bulb does not glow when the probes are hanging in air, because air is a bad conductor of electricity.

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Re-Attempt Weekly Quiz Competition

Chemical Effects of Electric Current Test - 9

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Chemical Effects of Electric Current Test - 9

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Question 1

Chrome onto tin

Iron onto tin

Tin onto iron

Chrome onto iron

Solution

Question 2

Tin

Copper

Zinc

Mercury

Solution

Question 3

Zinc is cheaper than tin.

Tin is toxic.

Zinc can prevent iron from coming into contact with water and air.

Rusting is prevented even when the zinc layer is broken.

Solution

Question 4

Distilled water is a good conductor of electricity.

An LED glows even when a weak electric current flows through it.

Only hydrated salt solutions conduct electricity.

Zinc plating is done to make the object scratch proof.

Solution

Question 5

Solid sodium chloride

Vinegar

Distilled water

Liquid oxygen

Solution

Question 6

From positive electrode to negative electrode

From negative electrode to positive electrode

Both (A) and (B)

Cannot be said

Solution

Question 7

In metals/outer electrons are strongly bound to the atom.

In metals, outer electrons are loosely bound to the atom.

In metals, inner electrons are loosely bound to the atom.

In metals, protons can detach from the nucleus and conduct electricity.

Solution

Question 8

Tin is less reactive than the metal the can is made of.

Tin is cheap.

Tin is strong and shiny in appearance

Tin is lighter than other metals.

Solution

Question 9

copper electrode.

anode.

cathode.

zinc electrode.

Solution

Question 10

Air absorbs electricity.

Air is a bad conductor of electricity.

Electricity is discharged into air.

Air disperses electricity.

Solution

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