Chemical Reactions Test

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Chemical Reactions Test - 3

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

A
Photosynthesis

B
Respiration

C
Sublimation

D
Rusting
Question 11
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What is the other name of baking soda?

A
Sodium bicarbonate

B
Sodium carbonate

C
Sodium chloride

D
Sodium hydroxide
Question 12
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Which type of change takes place during the formation of curd from milk?

A
Physical change

B
Temporary change

C
Permanent change

D
Reversible change
Question 13
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Which of the following is a decomposition reaction?

A
2H₂O 2H₂ + O₂

B
2Na + Cl₂ 2NaCl

C
Ba + F₂ BaF₂

D
Fe + CuSO₄ FeSO₄ + Cu
Question 14
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How many atoms of copper should be added in the products to balance the given chemical equation?
2Fe + 2CuSO₄ 2FeSO₄ + Cu

A
1

B
2

C
0

D
4
Question 15
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In which form is copper element obtained in the given reaction?
Pb(s) + CuCl₂(aq) PbCl₂ (aq) + Cu(s)

A
Solid

B
Liquid

C
Aqueous

D
Gaseous
Question 16
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Which law justifies a balanced chemical equation?

A
Law of constant proportion

B
Law of constant composition

C
Law of conservation of mass

D
Law of conservation of energy
Question 17
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Why does an iron container turn reddish brown when exposed to moisture for long period of time?

A
Due to sublimation

B
Due to corrosion

C
Due to roasting

D
Due to tanning
Question 18
1 / -0

Which of the following gases is used to fill in the bags of potato chips to prevent oxidation?

A
Chlorine

B
Hydrogen

C
Nitrogen

D
Helium

Solution

When potato chips are surrounded by an unreactive gas such as nitrogen, there is no oxygen to cause their oxidation and make them rancid.
Question 19
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Which of the following food materials does not become rancid?

A
Potato chips

B
Vegetable oil

C
Fried sandwiches

D
Orange
Question 20
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Which of the following metals does not undergo corrosion?

A
Iron

B
Gold

C
Silver

D
Copper

Solution

Gold does not undergo corrosion as it is a non-reactive metal.