Physical and Chemical Changes Test

Result

Physical and Chemical Changes Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

A coating of _______ is deposited on iron bridges to prevent it from rusting.

A
platinum

B
zinc

C
silver

D
copper

Solution

Metals like platinum, silver, and copper are at a lower position in the reactivity series and are less reactive than iron. If a protective coating of platinum, silver, and copper is applied to iron, they won't be able to prevent corrosion as they are less reactive. Moreover, using these metals will not be cost-effective.
But, zinc is placed above iron in the reactivity series and, so it is more reactive. It gets oxidized before the iron object and thus protects it from rusting. Also, it is cost-effective.
Hence option B is correct.
Question 2
1 / -0

Stainless steel can protect iron from rusting as it contains:

A
tin

B
chromium

C
zinc

D
aluminium

Solution

Stainless steel can protect the iron from rusting or corrosion as it contains high percentages (16-36%) of chromium. This element is present in sufficient quantity that when exposed to oxidizing media it forms a thin, tightly adhering, and impervious oxide layer (predominantly $$CrO$$) that stops further corrosion.
Question 3
1 / -0

$$2Mg + O_2 \longrightarrow$$

A
$$MgO$$

B
$$2MgO$$

C
$$MgO_2$$

D
$$2MgO_2$$

Solution

$$2Mg + O_2 \longrightarrow$$ $$2MgO$$

Magnesium is an alkaline earth metal with symbol Mg. Magnesium burns in air by taking oxygen from air to form magnesium oxide and is basic in nature.
Question 4
1 / -0

Dissolution of common salt or sugar in water is an example of:

A
physical change

B
chemical change

C
both A and B

D
none of the above

Solution

Mixing salt or common salt with water results in a change in its physical state. Sugar and salt are solids. When added to water, they get dissolved and we can not see the solid particles anymore. But this does not change the nature of these substances, that is, no new substances are formed during the process. So, the dissolution of salt or sugar in water is a physical change.
Question 5
1 / -0

Ripening of fruits and growing of plant into a tree is an example of:

A
physical change

B
chemical change

C
Both A and B

D
None of the above

Solution

A change in which chemical composition and chemical properties of the reacting substances undergo a change is called a chemical change. During ripening of fruits or growing of plant into a tree, a chemical change occurs which helps in ripening and growing of plants into tree and cannot be reversed.
Question 6
1 / -0

When magnesium is burnt in presence of air, the weight of magnesium:

A
increases

B
decreases

C
does not change

D
increases then decreases

Solution

When magnesium is burnt in the air, it reacts with oxygen in the air and forms magnesium oxide. Hence, the weight of magnesium increases.
Question 7
1 / -0

During a chemical change :

A
atoms change.

B
atoms recombine to form different substances.

C
a substance remain the same chemically.

D
none of these
Question 8
1 / -0

Match the columns:

I II
(a) Physical change (i) Curdling of milk
(b) Chemical change (ii) Demagnetisation of magnets
(iii) Digestion of food
(iv) Crystallisation of substance
(v) Rusting of iron

A
a: i, ii, iii; b: iv, v

B
a: ii, iv;   b: i, iii, iv

C
a: ii, iv;   b: i, iii, v

D
a: iii, v;   b: i, ii, iv

Solution

A change in which only the physical properties of the substance are changed, while its chemical composition remains unchanged, is called a physical change. Crystallisation of substance and demagnetisation of magnets come under this change.

A change in which chemical composition and chemical properties of the reacting substances undergo a change is called a chemical change.
For eg., curdling of milk, digestion of food, rusting of iron
Question 9
1 / -0

Chemical change are characterised by ___________.

A
Formation of new substance

B
Release of energy

C
Absorption of energy

D
Reversible

Solution

A chemical change is characterized by the formation of a new substance. Because during the formation of a new substance, Chemical composition changes.
Question 10
1 / -0

Sun tanning is a/an :

A
Physical change

B
Chemical change

C
Both a and b

D
None of the above

Solution

Sun tanning is a chemical change as vitamin D is produced during tanning. As new products are formed during sun tanning, it is considered to be a chemical change.

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Re-Attempt Weekly Quiz Competition

	I		II
(a)	Physical change	(i)	Curdling of milk
(b)	Chemical change	(ii)	Demagnetisation of magnets
		(iii)	Digestion of food
		(iv)	Crystallisation of substance
		(v)	Rusting of iron

Physical and Chemical Changes Test - 13

Result

Physical and Chemical Changes Test - 13

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SHARING IS CARING

Question 1

platinum

zinc

silver

copper

Solution

Question 2

tin

chromium

zinc

aluminium

Solution

Question 3

$$MgO$$

$$2MgO$$

$$MgO_2$$

$$2MgO_2$$

Solution

Question 4

physical change

chemical change

both A and B

none of the above

Solution

Question 5

physical change

chemical change

Both A and B

None of the above

Solution

Question 6

increases

decreases

does not change

increases then decreases

Solution

Question 7

atoms change.

atoms recombine to form different substances.

a substance remain the same chemically.

none of these

Question 8

a: i, ii, iii; b: iv, v

a: ii, iv; b: i, iii, iv

a: ii, iv; b: i, iii, v

a: iii, v; b: i, ii, iv

Solution

Question 9

Formation of new substance

Release of energy

Absorption of energy

Reversible

Solution

Question 10

Physical change

Chemical change

Both a and b

None of the above

Solution

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