Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 20

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Weekly Quiz Competition

Question 1
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Which of the following elements is placed in Kerosene?

A
$N a$

B
$F e$

C
$P$

D
$H e$

Solution

Sodium $(N a)$ is a highly reactive element. It can even react with atmospheric gases and water vapours due to which if they are kept exposed to an open atmosphere they might react and catch fire.
In order to isolate them from the environmental conditions highly reactive metals are stored in containers filled with Kerosene.
Hence, option (A) is correct.
Question 2
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When Sodium reacts with $C l_{2}$ , the molecular formula in the balanced equation is:

A
$N a (s) + 2 C l_{2} (g) \to 2 N a C l (s)$

B
$2 N a (s) + 2 C l_{2} (g) \to 2 N a C l (s)$

C
$N a (s) + C l_{2} (g) \to N a C l (s)$

D
$2 N a (s) + C l_{2} (g) \to 2 N a C l (s)$

Solution

The balanced reaction of Sodium metal reacting with Chlorine gas can be represented by this equation.
$2 N a (s) + C l_{2} (g) \to 2 N a C l (s)$
Hence, option (D) is correct.
Question 3
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Which of the following reactions is endothermic?

A
Photosynthesis

B
Combustion

C
Condensation

D
Neutralization

Solution

In Photosynthesis plant leaves absorb sunlight in order to prepare their food. Since there is the absorption of Heat (or Energy). Hence it is an endothermic process.
In combustion also Energy is released in the form of Heat and is an Exothermic Process.
For condensation, the molecules are giving up their heat energy and it will be Exothermic.
In Neutralisation also Energy is released in the form of Heat when an acid and base react with each other to form salt and water. Hence is an Exothermic Process.
Hence, option (A) is correct.
Question 4
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Rust is chemically defined as _______.

A
$F e_{2} O_{3} . x H_{2} O$

B
$F e_{3} O_{4} . x H_{2} O$

C
$F e_{2} O_{3} . 2 H_{2} O$

D
$F e_{3} O_{4} . 2 H_{2} O$

Solution

$F e_{2} O_{3} . x H_{2} O$
In the formula of ferric oxide the $x$ represents the number of moles of water molecules absorbed by ferric oxide.
Hence, option (A) is correct.
Question 5
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Nitrogen gas is used by chips manufacturers because Nitrogen is a/an _____.

A
oxidizing agent

B
reducing agent

C
antioxidant

D
catalyst

Solution

The packet of chips is flushed with only Nitrogen gas. This is because Nitrogen is an antioxidant. It prevents the chips from being oxidized. If we flush the packets of chips with Oxygen, then the chips react with Oxygen and become rancid and the smell and taste of food change.
Hence, option (C) is correct.
Question 6
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Who diagrammed the first chemical equation?

A
Dalton

B
Lavoisier

C
Jean Beguin

D
Mendeleev

Solution

In the $1615$ edition of his textbook, Jean Beguin made the first-ever chemical equation or rudimentary reaction diagrams, showing the results of reactions in which there are two or more reagents.
Hence, option (C) is correct.
Question 7
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Which of the following is the reducing agent in the reaction given below?
$F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}$

A
$F e_{2} O_{3}$

B
$C O$

C
$F e$

D
$C O_{2}$

Solution

$F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}$
In the above reaction, we see that after the reaction is carried out $C O$ gains an Oxygen and gets oxidized. Since, the compound which gets oxidized takes an Oxygen or releases an $H$ , ultimately acts as a Reducing Agent.
Hence, option (B) is correct.
Question 8
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Complete the given reaction.
$C H_{4} + 2 O_{2} \to C O_{2} +________$

A
$H_{2}$

B
$2 H_{2} O$

C
$3 O_{2}$

D
$C$

Solution

The reaction is an example of Combustion of Methane in the presence of Oxygen, it will always emit Carbon Dioxide and Water.
The complete reaction will be:
$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$
Hence, option (B) is correct.
Question 9
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What happens when dilute $H C l$ is added to iron filings?

A
Hydrogen gas and Iron Chloride are produced.

B
Chlorine gas and Iron Hydroxide are produced.

C
No reaction takes place.

D
Iron, Salt and Water are produced.

Solution

When dilute $H C l$ is added to $F e$ then Ferrous Chloride $(F e C l_{2})$ and Hydrogen gas $(H_{2})$ will be formed.
Hence, option (A) is correct.
Question 10
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Which of the following options is a physical change?

A
Cooking of an egg

B
Melting of an ice cube

C
Burning of coal

D
Rusting of iron

Solution

As we see that in melting of an ice cube there is only a change in the state of water and no chemical changes and hence is only a physical change. The remaining $3$ options are examples of chemical change in which products cannot be brought back to the same state as they were before the reaction.
Hence, option (B) is correct.
Question 11
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Hydration means addition of _______.

A
Hydrogen

B
Hydrogen Chloride

C
Sulphuric Acid

D
Water

Solution

Hydration means the addition of Water.
Hence, the option (D) is correct.
Question 12
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Photolysis is an example of:

A
Decomposition Reaction

B
Addition Reaction

C
Displacement Reaction

D
Oxidation Reaction

Solution

Photolysis (also called photodissociation and photodecomposition) is a chemical reaction in which an inorganic chemical (or an organic chemical) is broken down by photons and is the interaction of one or more photons with one target molecule.
Breaking of one compound to two or more products refers to Decomposition Reaction.
Hence, option (A) is correct.
Question 13
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A solution of substance X is used for whitewashing. What is X?

A
$C a O$

B
$C a {(O H)}_{2}$

C
$C a C O_{3}$

D
$C a C l_{2}$

Solution

The chemical substance X used for whitewashing is Calcium Oxide, also known as quicklime or burnt lime or lime.
Calcium Oxide is an alkaline earth flux with the chemical formula $C a O$ .
Hence, option (A) is correct.
Question 14
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Hydrogenation means addition of:

A
Hydrogen

B
Hydrogen Chloride

C
Sulphuric Acid

D
Water

Solution

Hydrogenation means addition of Hydrogen.
Hence, option (A) is correct.
Question 15
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$F e_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 F e$
The given reaction is a:

A
Combination Reaction

B
Reduction Reaction

C
Decomposition Reaction

D
Displacement Reaction

Solution

$F e_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 F e$
This is an example of a Displacement Reaction where Aluminium upon reacting with Iron Oxide gives Aluminium Oxide and Iron.
This is because aluminum is much reactive than Iron and displaces Iron from its constituent group.
Hence, the option (D) is correct.
Question 16
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$A B + C D \to A D + C B$
The given reaction is an example of _____.

A
Combination

B
Double Displacement

C
Reduction

D
Oxidation

Solution

In this question we can say that The ionic groups like B and D dissociate from their respective Cationic Groups and replace each others position depending upon the Reactivity of a metal or the Anionic Group.
This is a clear example of Double Displacement Reaction.
Hence, option (B) is correct.
Question 17
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In a Chemical Reaction, _______ take part.

A
only electrons

B
only protons

C
electrons and neutrons

D
protons and neutrons

Solution

Electrons in the outermost orbit called valence electrons take part in a chemical reaction.
The other atomic elements like protons, inner electrons, neutrons etc. do not take part in a Chemical Reaction.
Hence, option (A) is correct.
Question 18
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Food items can be preserved for a longer time when kept in a refrigerator because the:

A
reduction process is favoured at low temperatures

B
oxidation process is favoured at low temperatures

C
oxidation process is slower at low temperatures

D
reduction process is slower at low temperatures

Solution

Food Items deteriorate when exposed to atmospheric conditions because the food elements get oxidized and form oxides which are not suitable for edible purposes.
In a refrigerator the temperature is kept very low so that there is no action of microorganisms on food, which can very easily grow under atmospheric conditions.
Hence, option (C) is correct.
Question 19
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$N a C l (a q) + A g N O_{3} (a q) \to N a N O_{3} (a q) + A g C l (s)$
The given reaction is an example of:

A
Precipitation Reaction

B
Double Displacement Reaction

C
Combination Reaction

D
Redox Reaction

Solution

$N a C l (a q) + A g N O_{3} (a q) \to N a N O_{3} (a q) + A g C l (s)$
If we see the reaction we can say that both the Anionic groups exchange their cationic groups and create new products with different physical and chemical properties.
This shows that it is a Double Displacement Reaction.
Hence, option (B) is correct.
Question 20
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_________ is a reaction in which a chemical compound undergoes a structural rearrangement without any change in its net atomic composition.

A
Isomerisation

B
Metathesis

C
Synthesis

D
Analysis

Solution

Isomerisation is a reaction in which a chemical compound undergoes a structural rearrangement without any change in its net atomic composition.
Hence, option (A) is correct.
Question 21
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The decomposition of $C a C O_{3}$ is a/an _____ reaction.

A
endothermic

B
combustion

C
condensation

D
neutralisation

Solution

The decomposition of limestone $(C a C O_{3})$ to make lime $(C a O)$ is an endothermic process; it is necessary to heat limestone to a high temperature for this reaction to occur.
$C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
The decomposition of water into its elements by the process of electrolysis is another endoergic process.
Hence, option (A) is correct.
Question 22
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$2 N a (s) + 2 H C l (a q) \to 2 N a C l (a q) + H_{2} (g)$
The given reaction is an example of ______.

A
Redox Reaction

B
Double Displacement

C
Precipitation Reaction

D
Substitution

Solution

A substitution reaction (also known as single displacement reaction or single substitution reaction) is a chemical reaction during which one functional group in a chemical compound is replaced by another functional group.
In this case, the anion in $H C l$ i.e. $C l^{-}$ dissociates from $H^{+}$ and combines with a higher electropositive element $N a^{+}$ .
Hence, the option (D) is correct.
Question 23
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Magnesium ribbon is rubbed before burning because it has a coating of:

A
basic Magnesium Carbonate

B
basic Magnesium Oxide

C
basic Magnesium Sulphide

D
basic Magnesium Chloride

Solution

Magnesium ribbon is wrapped and cleaned before burning because it has a coating of basic Magnesium Oxide. It reacts with the Oxygen of the air to for a layer of white coloured Magnesium Oxide.
Rubbing of Magnesium metal before burning also helps to remove the surface impurities and allow total burning of the metal.
Hence, option (B) is correct.
Question 24
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Oxidation Reaction is a chemical process in which a substance gains:

A
Hydrogen

B
Oxygen

C
Chlorine

D
Nitrogen

Solution

The Oxidation Reaction is a chemical process in which a substance gains Oxygen or loses Hydrogen.
Hence, option (B) is correct.
Question 25
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A balanced chemical equation has:

A
an equal number of atoms

B
an equal mass

C
an equal number of protons

D
an equal number of electrons

Solution

A balanced chemical equation has an equal number of atoms on both the reactants and products side. The mass before and after a reaction and Electronic Configuration of an atom might change after reaction takes place.
Hence, option (A) is correct.

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Chemical Reactions and Equations Test - 20

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Question 1

Na

Fe

P

He

Solution

Question 2

Na(s)+2Cl2(g)→2NaCl(s)

2Na(s)+2Cl2(g)→2NaCl(s)

Na(s)+Cl2(g)→NaCl(s)

2Na(s)+Cl2(g)→2NaCl(s)

Solution

Question 3

Photosynthesis

Combustion

Condensation

Neutralization

Solution

Question 4

Fe2O3.xH2O

Fe3O4.xH2O

Fe2O3.2H2O

Fe3O4.2H2O

Solution

Question 5

oxidizing agent

reducing agent

antioxidant

catalyst

Solution

Question 6

Dalton

Lavoisier

Jean Beguin

Mendeleev

Solution

Question 7

Fe2O3

CO

Fe

CO2

Solution

Question 8

H2

2H2O

3O2

C

Solution

Question 9

Hydrogen gas and Iron Chloride are produced.

Chlorine gas and Iron Hydroxide are produced.

No reaction takes place.

Iron, Salt and Water are produced.

Solution

Question 10

Cooking of an egg

Melting of an ice cube

Burning of coal

Rusting of iron

Solution

Question 11

Hydrogen

Hydrogen Chloride

Sulphuric Acid

Water

Solution

Question 12

Decomposition Reaction

Addition Reaction

Displacement Reaction

Oxidation Reaction

Solution

$N a$

$F e$

$P$

$H e$

$N a (s) + 2 C l_{2} (g) \to 2 N a C l (s)$

$2 N a (s) + 2 C l_{2} (g) \to 2 N a C l (s)$

$N a (s) + C l_{2} (g) \to N a C l (s)$

$2 N a (s) + C l_{2} (g) \to 2 N a C l (s)$

$F e_{2} O_{3} . x H_{2} O$

$F e_{3} O_{4} . x H_{2} O$

$F e_{2} O_{3} . 2 H_{2} O$

$F e_{3} O_{4} . 2 H_{2} O$

$F e_{2} O_{3}$

$C O$

$F e$

$C O_{2}$

$H_{2}$

$2 H_{2} O$

$3 O_{2}$

$C$

$C a O$

$C a {(O H)}_{2}$

$C a C O_{3}$

$C a C l_{2}$