Chemical Reactions Test

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Chemical Reactions Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is a not a chemical change?

A
Souring of milk

B
Rusting of iron

C
Melting of ice

D
Respiration
Question 2
1 / -0

Which of the following is not an example of physical change?

A
Expansion of iron due to heating

B
Magnetization of an iron piece

C
Formation of water vapours

D
Formation of wine from grape juice
Question 3
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What is the process of conversion of sugar to alcohol and carbon dioxide by yeast called?

A
Fermentation

B
Photosynthesis

C
Chemosynthesis

D
Sublimation
Question 4
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Which of the following statements justifies that photosynthesis is a chemical change?

A
It is a temporary change and is usually reversible.

B
New substances with different composition and different properties are formed.

C
There is change in shape and size of the matter.

D
There is a change in the state of matter.
Question 5
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Which of the following statements justifies the law of conservation of mass?

A
2 g of carbon reacts with 5 g of oxygen to give 3 g of carbon dioxide.

B
2.5 g of carbon reacts with 3.5 g of oxygen to give 6 g of carbon dioxide.

C
5 g of carbon reacts with 2 g of oxygen to give 2.5 g of carbon dioxide.

D
10 g of carbon reacts with 2 g of oxygen to give 2 g of carbon dioxide.
Question 6
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What is law of conservation of mass?

A
Mass can neither be created nor destroyed.

B
Mass of all the reactants in a reaction is same.

C
Mass of products can be created by multiplying the mass of reactants.

D
All the elements in a reaction are present in a fixed proportion.
Question 7
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Which of the following is a balanced chemical equation?

A
2Na + 2Cl₂ → 2NaCl

B
2C + 3O₂ → 5CO₂

C
2H₂ + 2Cl₂ → 2HCl

D
2H₂ + O₂ → 2H₂O

Solution

In a balanced chemical equation, the number of atoms of different elements on both sides of the equation is always equal.

In equation (4), the number of atoms (H and O) is equal on both the sides of the equation. Thus, equation (4) is a balanced chemical equation.
Question 8
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How many atoms of chlorine react with hydrogen gas in the given equation?

2H₂ + 2Cl₂ → 2HCl

A
2

B
4

C
1

D
6
Question 9
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Which of the following is a combination reaction?

A
AB → A + B

B
A + B → AB

C
AB + C → AC + B

D
AB + CD → AC + BD
Question 10
1 / -0

Which of the following types of reaction involves both chemical and physical changes?

A
Photosynthesis

B
Respiration

C
Sublimation

D
Rusting

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Chemical Reactions Test - 1

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Question 1

Souring of milk

Rusting of iron

Melting of ice

Respiration

Question 2

Expansion of iron due to heating

Magnetization of an iron piece

Formation of water vapours

Formation of wine from grape juice

Question 3

Fermentation

Photosynthesis

Chemosynthesis

Sublimation

Question 4

It is a temporary change and is usually reversible.

New substances with different composition and different properties are formed.

There is change in shape and size of the matter.

There is a change in the state of matter.

Question 5

2 g of carbon reacts with 5 g of oxygen to give 3 g of carbon dioxide.

2.5 g of carbon reacts with 3.5 g of oxygen to give 6 g of carbon dioxide.

5 g of carbon reacts with 2 g of oxygen to give 2.5 g of carbon dioxide.

10 g of carbon reacts with 2 g of oxygen to give 2 g of carbon dioxide.

Question 6

Mass can neither be created nor destroyed.

Mass of all the reactants in a reaction is same.

Mass of products can be created by multiplying the mass of reactants.

All the elements in a reaction are present in a fixed proportion.

Question 7

2Na + 2Cl2 → 2NaCl

2C + 3O2 → 5CO2

2H2 + 2Cl2 → 2HCl

2H2 + O2 → 2H2O

Solution

Question 8

2

4

1

6

Question 9

AB → A + B

A + B → AB

AB + C → AC + B

AB + CD → AC + BD

Question 10

Photosynthesis

Respiration

Sublimation

Rusting

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2Na + 2Cl₂ → 2NaCl

2C + 3O₂ → 5CO₂

2H₂ + 2Cl₂ → 2HCl

2H₂ + O₂ → 2H₂O