Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

Name the type of following chemical reaction.

$$CaCO_3 \rightarrow CaO + CO_2$$

A
Combination

B
Displacement

C
Decomposition

D
Synthesis

Solution

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. These reactions often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.

$$CaCO_3 \rightarrow CaO + CO_2$$
Question 2
1 / -0

Correct balanced equation from the following reactions is:

A
$$Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$

B
$$Al_4C_3 + 2H_2O \rightarrow 2Al(OH)_3 + 3CH_4$$

C
$$2Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$

D
$$Al_4C_3 + 16H_2O \rightarrow 4Al(OH)_3 + CH_4$$

Solution

Correct balanced equation from the following reactions is :
$$Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$

$$\text{Atoms Atoms on the reactant side (LHS) Atoms on the product side (RHS)}$$
$$\text{Al 4 4 }$$
$$\text{C 3 3 }$$
$$\text{H 24 24 }$$
$$\text{O 12 12 }$$

Here all the atoms on both sides are the same which indicates that this is a balanced reaction.
All other reaction does not have the same number of atoms on both sides.
Hence, option $$A$$ is correct.
Question 3
1 / -0

Correct balanced equation from the following reactions is:

A
$$Al+2NaOH+2H_2O \rightarrow NaAlO_2+3H_2 $$

B
$$2Al+2NaOH+2H_2O \rightarrow 2NaAlO_2+3H_2 $$

C
$$2Al+NaOH+2H_2O \rightarrow NaAlO_2+3H_2 $$

D
$$2Al+2NaOH+H_2O \rightarrow 2NaAlO_2+H_2 $$

Solution
Question 4
1 / -0

Select the reaction in which electricity is responsible for the chemical change.

A
Formation of lead(II) bromide

B
Decomposition of water

C
Hydrogenation of oils

D
None of these
Question 5
1 / -0

Which is the balanced equation for treatment of magnesium nitride with warm water?

A
$$ { Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$

B
$$ 2{ Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+6Mg\left( OH \right) _{ 2 }$$

C
$$ { Mg }_{ 3 }{ N }_{ 2 }+{ 3H }_{ 2 }O\rightarrow { NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$

D
$$ 3{ Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+9Mg\left( OH \right) _{ 2 }$$

Solution

On balancing the atoms of each of the elements, we will get the following chemical equation:

$$ { Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$

Hence, option A is correct.
Question 6
1 / -0

Name the type of following chemical reaction.
$$KNO_3 + H_2SO_4 \rightarrow HNO_3 + KHSO_4$$

A
Displacement Reaction

B
Double Displacement Reaction

C
Combination Reaction

D
Decomposition Reaction

Solution

A double displacement reaction is a type of reaction where part of one reactant is replaced by part of another reactant.
Double displacement reactions take the form:
AB + CD $$\rightarrow$$ AD + CB
$$KNO_3 + H_2SO_4 \rightarrow HNO_3 + KHSO_4$$
Question 7
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Name the type of following chemical reaction.
$$NH_4Cl \rightarrow NH_3 + HCl$$

A
Synthesis

B
Combination

C
Displacement

D
Decomposition

Solution

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds. These reactions often involve an energy source such as heat, light, or electricity that breaks apart the bonds of compounds.
$$NH_4Cl \rightarrow NH_3 + HCl$$
Question 8
1 / -0

Name the type of following chemical reaction.

$$PbO_2 + SO_2 \rightarrow PbSO_4$$

A
Combination

B
Displacement

C
Double displacement

D
Neutralisation

Solution

A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound.

$$PbO_2 + SO_2 \rightarrow PbSO_4$$
Question 9
1 / -0

Correct balanced equation from the following reactions is :

A
$$K_2Cr_2O_7 + 8H_2SO_4 \rightarrow K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

B
$$K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

C
$$2K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + 2Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

D
$$2K_2Cr_2O_7 + 4H_2SO_4 \rightarrow 2K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

Solution

C) $$2K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + 2Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

$$\text{Atoms On reactant side (LHS) on the product side (RHS)}$$
$$\text {K 4 4}$$
$$\text {Cr 4 4}$$
$$\text{O 46 46}$$
$$\text{H 16 16}$$
$$\text {S 8 8}$$

As the number of atoms on the reactant and product side is the same.
Hence, option $$C$$ is correct.
Question 10
1 / -0

The correct balanced equation from the following is :

A
$$Zn + 2KOH \rightarrow 2K_2ZnO_2 + H_2$$

B
$$Zn + 2KOH \rightarrow K_2ZnO_2 + H_2$$

C
$$Zn + KOH \rightarrow K_2ZnO_2 + 2H_2$$

D
$$2Zn + KOH \rightarrow K_2ZnO_2 + H_2$$

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Chemical Reactions and Equations Test - 27

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Chemical Reactions and Equations Test - 27

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Question 1

Combination

Displacement

Decomposition

Synthesis

Solution

Question 2

$$Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$

$$Al_4C_3 + 2H_2O \rightarrow 2Al(OH)_3 + 3CH_4$$

$$2Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$

$$Al_4C_3 + 16H_2O \rightarrow 4Al(OH)_3 + CH_4$$

Solution

Question 3

$$Al+2NaOH+2H_2O \rightarrow NaAlO_2+3H_2 $$

$$2Al+2NaOH+2H_2O \rightarrow 2NaAlO_2+3H_2 $$

$$2Al+NaOH+2H_2O \rightarrow NaAlO_2+3H_2 $$

$$2Al+2NaOH+H_2O \rightarrow 2NaAlO_2+H_2 $$

Solution

Question 4

Formation of lead(II) bromide

Decomposition of water

Hydrogenation of oils

None of these

Question 5

$$ { Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$

$$ 2{ Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+6Mg\left( OH \right) _{ 2 }$$

$$ { Mg }_{ 3 }{ N }_{ 2 }+{ 3H }_{ 2 }O\rightarrow { NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$

$$ 3{ Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+9Mg\left( OH \right) _{ 2 }$$

Solution

Question 6

Displacement Reaction

Double Displacement Reaction

Combination Reaction

Decomposition Reaction

Solution

Question 7

Synthesis

Combination

Displacement

Decomposition

Solution

Question 8

Combination

Displacement

Double displacement

Neutralisation

Solution

Question 9

$$K_2Cr_2O_7 + 8H_2SO_4 \rightarrow K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

$$K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

$$2K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + 2Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

$$2K_2Cr_2O_7 + 4H_2SO_4 \rightarrow 2K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$

Solution

Question 10

$$Zn + 2KOH \rightarrow 2K_2ZnO_2 + H_2$$

$$Zn + 2KOH \rightarrow K_2ZnO_2 + H_2$$

$$Zn + KOH \rightarrow K_2ZnO_2 + 2H_2$$

$$2Zn + KOH \rightarrow K_2ZnO_2 + H_2$$

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