Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

The reaction $$Pb(NO_{3})_{2} + 2NaI \rightarrow 2NaNO_{3} + PbI_{2}\downarrow$$ is classified as:

A
Combination reaction

B
Decomposition reaction

C
Single displacement reaction

D
Double displacement reaction

Solution

Double displacement reaction is defined as the chemical reactions in which one component each of both the reacting molecules is exchanged to form the products.
The reaction $$Pb(NO_{3})_{2} + 2NaI \rightarrow 2NaNO_{3} + PbI_{2}\downarrow$$ is classified as double displacement reaction.
Question 2
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Find the example of a combination reaction from among these:

A
$$A + B \rightarrow C + D$$

B
$$A + B \rightarrow AB$$

C
$$AB + CD \rightarrow AC + BD$$

D
$$AB + CD \rightarrow ACD + B$$

E
None of these

Solution

A reaction is said to be a combination reaction when two or more reactants combine to form a single product.
Thus, reaction in option A is a combination reaction, because in this reaction A combines with B to give AB.
Question 3
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The balanced molar relationship for the reaction given below is:
$$\displaystyle { H }_{ 2 }{ O }_{ 2 }\rightarrow { H }_{ 2 }O+{ O }_{ 2 }$$

A
$$1:1:1$$

B
$$2:1:1$$

C
$$1:2:1$$

D
$$2:2:1$$

E
$$2:1:2$$

Solution

The unbalanced chemical equation is:
$$\displaystyle { H }_{ 2 }{ O }_{ 2 }\rightarrow { H }_{ 2 }O+{ O }_{ 2 }$$

Here, hydrogen atoms are balanced. The oxygen atoms can be balanced if we multiply $$H_2O_2$$ with 2 and $$H_2O$$ with 2.

$$\displaystyle 2{ H }_{ 2 }{ O }_{ 2 }\rightarrow 2{ H }_{ 2 }O+{ O }_{ 2 }$$

So, the balanced molar relationship for the reaction is $$2:2:1$$.
Question 4
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Choose the incorrect statement

A
Combination of two different elements is possible.

B
Decomposition of single compound is not possible.

C
Decomposition of a chemical compound into two new compounds is possible.

D
A combination of an element with a compound to form a new product is possible.

Solution

A combination reaction is a type of reaction where two or more substances (elements or compounds) combine to form a single product.

A decomposition reaction is a type of chemical reaction in which a compound breaks down into two or more elements or new compounds.

Only option 'B' seems wrong after reading the definitions of both combination and decomposition reactions.
Question 5
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(i) Reaction between calcium oxide and water is a _______ reaction
(ii) Treatment of mercuric oxide with strong heat is a ________ reaction

A
Decomposition, Combination

B
Combination, Combination

C
Combination, Decomposition

D
Decomposition, Decomposition

Solution

(i) The reaction between calcium oxide and water is a combination reaction.
$$CaO(s) + H_2O(l) \longrightarrow Ca(OH)_2(s)$$

(ii) The treatment of mercuric oxide with strong heat is a decomposition reaction.
$$2HgO(s) + heat \longrightarrow 2Hg(s) + O_2$$
Question 6
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Identify the product(s) which will be formed by using the information provided about reactants:
$$HF(aq)+Ca{(OH)}_{2}(aq)\rightarrow$$

A
$${H}_{2}O+Ca{F}_{2}$$

B
$$OF+Ca{H}_{2}$$

C
$$HOH+{F}_{2}Ca$$

D
$$O{F}_{2}+Ca{H}_{2}$$

E
$$FOH+Ca{H}_{2}$$

Solution

Hydrogen fluoride reacts with calcium hydroxide to form water and calcium diflouride.
$$HF(aq) + Ca(OH)_2 (aq) \rightarrow H_2O + CaF_2$$
Question 7
1 / -0

Balancing of equations is based on:

A
Avogadro's number

B
Principle of conservation of momentum

C
Conditions for a chemical reaction to take place

D
Law of conservation of mass

Solution

Matter cannot be destroyed or created in chemical reactions. This is the law of conservation of mass. Thus the mass of the products is equal to the mass of the reactants in a chemical reaction. Hence, balancing of equation is based on law of conservation of mass or matter.
Question 8
1 / -0

Combustion reaction of coal is a/an __________ reaction.

A
exothermic

B
auto-catalytic

C
endothermic

D
None of these

Solution

Combustion reaction of coal is an exothermic reaction as heat is evolved in the reaction. In this reaction, carbon reacts with oxygen to give carbon dioxide and heat. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions.
Question 9
1 / -0

Balanced chemical equations imply which of the following?
$$I$$. Numbers of molecules are conserved in chemical change
$$II$$. Numbers of atoms are conserved in chemical change.
$$III$$. Mass is conserved in chemical change.

A
$$I$$ only

B
$$II$$ only

C
$$I$$ and $$III$$

D
$$II$$ and $$III$$

Solution

Because A balance equation
$$FeSO_4+Zn\longrightarrow ZnSO_4+Fe$$
Hence number of atoms are conserved in chemical change and mass is conserved in chemical change.
Question 10
1 / -0

Identify the product(s) which will be formed by using the information provided about the reactants:
$$Al(s)+{O}_{2}(g)\rightarrow$$

A
$${Al}_{2}{O}_{3}$$

B
$$Al{O}_{2}$$

C
$${Al}_{3}{O}_{2}$$

D
$${Al}_{2}{O}_{2}$$

E
$$AlO$$

Solution

Aluminium metal with oxygen gas forms $$Al_2O_3$$.
$$4Al(s)+3{O}_{2}(g)\rightarrow 2Al_2O_3$$

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Chemical Reactions and Equations Test - 32

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Chemical Reactions and Equations Test - 32

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Question 1

Combination reaction

Decomposition reaction

Single displacement reaction

Double displacement reaction

Solution

Question 2

$$A + B \rightarrow C + D$$

$$A + B \rightarrow AB$$

$$AB + CD \rightarrow AC + BD$$

$$AB + CD \rightarrow ACD + B$$

None of these

Solution

Question 3

$$1:1:1$$

$$2:1:1$$

$$1:2:1$$

$$2:2:1$$

$$2:1:2$$

Solution

Question 4

Combination of two different elements is possible.

Decomposition of single compound is not possible.

Decomposition of a chemical compound into two new compounds is possible.

A combination of an element with a compound to form a new product is possible.

Solution

Question 5

Decomposition, Combination

Combination, Combination

Combination, Decomposition

Decomposition, Decomposition

Solution

Question 6

$${H}_{2}O+Ca{F}_{2}$$

$$OF+Ca{H}_{2}$$

$$HOH+{F}_{2}Ca$$

$$O{F}_{2}+Ca{H}_{2}$$

$$FOH+Ca{H}_{2}$$

Solution

Question 7

Avogadro's number

Principle of conservation of momentum

Conditions for a chemical reaction to take place

Law of conservation of mass

Solution

Question 8

exothermic

auto-catalytic

endothermic

None of these

Solution

Question 9

$$I$$ only

$$II$$ only

$$I$$ and $$III$$

$$II$$ and $$III$$

Solution

Question 10

$${Al}_{2}{O}_{3}$$

$$Al{O}_{2}$$

$${Al}_{3}{O}_{2}$$

$${Al}_{2}{O}_{2}$$

$$AlO$$

Solution

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