Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The balanced chemical reaction for the following reaction is given as
CO₂_(aq) + H₂O_(l) → C₆H₁₂O_6(aq) + O₂ _(aq)

A
6 CO₂_(aq) +12 H₂O_(l) → C₆H₁₂O_6(aq) + O_2(aq)

B
6 CO2_(aq) + 6 H₂O_(l) → C₆H₁₂O_6(aq) + 5 O_2(aq)

C
6 CO_2(aq) + 6 H₂O_(l) → C₆H₁₂O_6(aq) + 6 O_2(aq)

D
6 CO_2(aq) + 3 H₂O_(l) → C₆H₁₂O_6(aq) + 6 O_2(aq)

Solution

The correct balanced chemical equation is

6 CO_2(aq) + 6 H₂O_(l) → C₆H₁₂O_6(aq) + 6 O_2(aq)
Question 2
1 / -0

An example of combination reaction between two elements is

A
Formation of limestone

B
Formation of sulphur trioxide

C
Formation of water

D
Formation of carbon dioxide from Carbon monoxide and oxygen

Solution

Hydrogen and oxygen in elemental form combine to form water.
Question 3
1 / -0

In a reaction between zinc and hydrochloric acid, the changes accompanying a reaction are

A
Evolution of gas and heat

B
Evolution of steam

C
Formation of precipitate

D
Formation of dazzling white light

Solution

Hydrogen gas and heat are produced in the reaction between zinc and hydrochloric acid.
Question 4
1 / -0

The number of reactants in a decomposition reaction is:

A
One

B
Two

C
Three

D
Four

Solution

In a decomposition reaction, a single reactant decomposes to form a number of products.
Question 5
1 / -0

Burning of Magnesium ribbon in air is an example of

A
Decomposition reaction

B
Combination reaction

C
Endothermic reaction

D
Reduction reaction

Solution

Magnesium ribbon burns in air to form Magnesium oxide. This is a combination reaction as two reactants combine to form a single product.

2Mg + O₂ → 2MgO
Question 6
1 / -0

The reactions in which a precipitate is formed are also known as

A
Combination reactions

B
Decomposition reactions

C
Precipitation reactions

D
None of these

Solution

The reactions in which a precipitate is formed are known as precipitation reactions.
Question 7
1 / -0

The temperature and pressure of a reaction are indicated by

A
Writing them either on the reactant side or the product side.

B
Writing them above or below the arrow.

C
Writing them on the reactant side.

D
Writing them on the product side.

Solution

The reaction conditions such as temperature, pressure, catalyst etc are indicated by writing them above or below the arrow.
Question 8
1 / -0

A drop of colourless liquid is poured over blue litmus paper and it turns to red. The colourless liquid is

A
dilute hydrochloric acid

B
potassium hydroxide solution

C
pure water

D
sodium chloride solution

Solution

Acids turn blue litmus to red hence dilute hydrochloric acid turns blue litmus paper red.
Question 9
1 / -0

Freezing of water is a

A
Physical change

B
Chemical change

C
Both physical and chemical change

D
Exothermic reaction

Solution

Freezing of water is a physical change. The chemical composition does not change during the process.
Question 10
1 / -0

CH₃OH + CH₃COOH → CH₃COOCH₃ + H₂O ,
This reaction is an example of

A
Combination reaction

B
Photolytic Decomposition reaction

C
Electrolytic Decomposition reaction

D
None of the above

Solution

Since there are 2 reactants and two products, it is neither a combination nor a decomposition reaction.

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Chemical Reactions and Equations Test - 3

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Question 1

6 CO2(aq) +12 H2O(l) → C6H12O6(aq) + O2(aq)

6 CO2(aq) + 6 H2O(l) → C6H12O6(aq) + 5 O2(aq)

6 CO2(aq) + 6 H2O(l) → C6H12O6(aq) + 6 O2(aq)

6 CO2(aq) + 3 H2O(l) → C6H12O6(aq) + 6 O2(aq)

Solution

Question 2

Formation of limestone

Formation of sulphur trioxide

Formation of water

Formation of carbon dioxide from Carbon monoxide and oxygen

Solution

Question 3

Evolution of gas and heat

Evolution of steam

Formation of precipitate

Formation of dazzling white light

Solution

Question 4

One

Two

Three

Four

Solution

Question 5

Decomposition reaction

Combination reaction

Endothermic reaction

Reduction reaction

Solution

Question 6

Combination reactions

Decomposition reactions

Precipitation reactions

None of these

Solution

Question 7

Writing them either on the reactant side or the product side.

Writing them above or below the arrow.

Writing them on the reactant side.

Writing them on the product side.

Solution

Question 8

dilute hydrochloric acid

potassium hydroxide solution

pure water

sodium chloride solution

Solution

Question 9

Physical change

Chemical change

Both physical and chemical change

Exothermic reaction

Solution

Question 10

Combination reaction

Photolytic Decomposition reaction

Electrolytic Decomposition reaction

None of the above

Solution

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6 CO₂_(aq) +12 H₂O_(l) → C₆H₁₂O_6(aq) + O_2(aq)

6 CO2_(aq) + 6 H₂O_(l) → C₆H₁₂O_6(aq) + 5 O_2(aq)

6 CO_2(aq) + 6 H₂O_(l) → C₆H₁₂O_6(aq) + 6 O_2(aq)

6 CO_2(aq) + 3 H₂O_(l) → C₆H₁₂O_6(aq) + 6 O_2(aq)