Chemical Reactions and Equations Test

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Chemical Reactions and Equations Test - 35

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Weekly Quiz Competition

Question 1
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Identify an element combination reaction from the following.

A
$$2Pb(NO_{3})_{2} \rightarrow 2PbO + 4NO_{2} + O_{2}$$

B
$$2Al_{2}O_{3} \rightarrow 4Al + 3O_{2}$$

C
$$S + O_{2} \rightarrow SO_{2}$$

D
$$2CO + O_{2} \rightarrow 2CO_{2}$$

Solution

A reaction in which two or more reactants combine to form a single product is known as a combination reaction.
$$\therefore$$ The correct option is $$A$$.
Question 2
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Which of the following is not a decomposition reaction?

A
$$CaCO3 \rightarrow CaO + CO_{2}$$

B
$$2KClO_{3} \rightarrow 2KCl + 3O_{2}$$

C
$$2NaNO_{3} \rightarrow 2NaNO_{2} + O_{2}$$

D
$$H_{2} + Cl_{2} \rightarrow 2HCl$$

Solution

Decomposition is a kind of reaction where a single substance breaks into two or more products.
So, options $$A,B,C$$ are decomposition reaction.
Correct option is $$D$$.
Question 3
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When sodium hydroxide solution is added to copper sulfate solution, a blue precipitate of copper hydroxide is formed along with sodium sulfate solution. What kind of chemical reaction takes place between them?

A
Chemical combination reaction

B
Chemical decomposition reaction

C
Chemical displacement reaction

D
Chemical double decomposition reaction

Solution

Copper sulfate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide.
According to the equation:
$$2NaOH+CuSO_4→Na_2SO_4+Cu(OH)_2↓$$
Question 4
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$$KMnO_4+H_2SO_4+FeSO_4 \rightarrow K_2SO_4 + MnSO_4+Fe_2(SO_4)_3+H_2O$$

Coefficients of sulphuric acid and ferric sulphate in the balanced equation of above reaction are______and ______respectively.

A
8, 4

B
5, 8

C
4, 3

D
8, 5

Solution

The balanced equation can be written as:

$$2KMnO_{4} + 8H_{2}SO_{4} + 10FeSO_{4} \rightarrow K_{2}SO_{4} + 2MnSO_{4} + 5Fe_{2}(SO_{4})_{3} + 8H_{2}O$$

Coefficient of Sulphuric acid, $$H_2SO_4 = 8$$

Coefficient of Ferric sulphate, $$Fe_2(SO_4)_3 = 5$$

Therefore option D is correct answer.
Question 5
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Identify the type reaction from the following.
$$H_2CO_3 (aq) \rightarrow H_2O(l) + CO_2(g)$$

A
Combustion reaction

B
Decomposition reaction

C
Displacement reaction

D
Double displacement reaction

Solution

$$H_2CO_3 (aq) \rightarrow H_2O(l) + CO_2(g)$$

In this reaction, carbonic acid decomposes to form water and carbon dioxide gas. Hence, this is the example of a decomposition reaction.
Question 6
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Sodium bicarbonate on decomposition forms:

A
$$NaHCO_3$$

B
$$Na_2CO_3$$

C
$$Na_2CO_3 . 10H_2O$$

D
None of these

Solution

Sodium bicarbonate on decomposition forms sodium carbonate, water, and carbon dioxide.
$$\displaystyle 2NaHCO_3 \xrightarrow {heat} Na_2CO_3+H_2O+CO_2$$
Question 7
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Which of the following pairs will give displacement reactions?

A
$$NaCl$$ solution and copper metal

B
$$Mg{ Cl }_{ 2 }$$ solution and aluminium metal

C
$$FeS{ O }_{ 4 }$$ solution and silver metal

D
$$AgN{ O }_{ 3 }$$ solution and copper metal.

Solution

Metal above in activity series are more reactive and can displace the less reactive metal.
(a) $$NaCl$$ solution and copper metal
$$Na$$ is more reactive than $$Cu$$, thus it will not give diplacement reaction.

(b) $$MgCl_2$$ solution and aluminium metal.
$$Al$$ can not replace $$Mg$$ because it is lower on the reactivity series.

(c) $$FeSO_4$$ solution and silver metal
$$Ag$$ can not replace $$Fe$$ because it is lower on the reactivity series.

(d) $$AgNO_3$$ solution and copper metal.
$$Ag$$ can be replaced by $$Cu$$ as it is above silver in the reactivity series. Therefore, this pair will give displacement reaction.
$$AgNO_3 + Cu \rightarrow Cu(NO_3)_2 + Ag$$

Hence, option $$D$$ is correct.
Question 8
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Take 5 mL of sodium sulphate solution in a test tube and 5 mL of barium chloride solution in another test tube. Mix the two solutions slowly and leave the test tube undisturbed for some time. A white precipitate is formed after some time.
Which of the following statements is correct about the above reaction?

A
It is a double displacement reaction since exchange of ions occurs between the two reactants.

B
It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.

C
It is a displacement reaction since chloride ions are replaced by sulphate ions.

D
It is a neutralisation reaction since an acid reacts with alkali to give a salt.

Solution
Question 9
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Observe the reaction:

$$CaCO_{3(s)} + 2NaOH_{(aq)} \rightarrow Na_{2}CO_{3(aq)} + Ca(OH)_{2(aq)}$$

Which of the following is a type of above reaction?

A
Displacement reaction

B
Double displacement reaction

C
Combination reaction

D
Decomposition reaction

Solution

The given reaction is a double displacement reaction because there is an exchange of ions between the two reactants. $$Ca^{2+}$$ from $$CaCO_3$$ is getting exchanged with $$Na^+$$ from $$NaOH$$ to form two new products.
Question 10
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An example of reversible reaction is

A
$$Pb(NO_3)_2+2Nal=PbI_2+2NaNO_3$$

B
$$AgNO_3+HCl=AgCl +HNO_3$$

C
$$2Na+2H_2O=2NaOH+H_2$$

D
$$KNO_3+NaCl=KCl+NaNO_3$$

Solution

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Chemical Reactions and Equations Test - 35

Result

Chemical Reactions and Equations Test - 35

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Question 1

$$2Pb(NO_{3})_{2} \rightarrow 2PbO + 4NO_{2} + O_{2}$$

$$2Al_{2}O_{3} \rightarrow 4Al + 3O_{2}$$

$$S + O_{2} \rightarrow SO_{2}$$

$$2CO + O_{2} \rightarrow 2CO_{2}$$

Solution

Question 2

$$CaCO3 \rightarrow CaO + CO_{2}$$

$$2KClO_{3} \rightarrow 2KCl + 3O_{2}$$

$$2NaNO_{3} \rightarrow 2NaNO_{2} + O_{2}$$

$$H_{2} + Cl_{2} \rightarrow 2HCl$$

Solution

Question 3

Chemical combination reaction

Chemical decomposition reaction

Chemical displacement reaction

Chemical double decomposition reaction

Solution

Question 4

8, 4

5, 8

4, 3

8, 5

Solution

Question 5

Combustion reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

Solution

Question 6

$$NaHCO_3$$

$$Na_2CO_3$$

$$Na_2CO_3 . 10H_2O$$

None of these

Solution

Question 7

$$NaCl$$ solution and copper metal

$$Mg{ Cl }_{ 2 }$$ solution and aluminium metal

$$FeS{ O }_{ 4 }$$ solution and silver metal

$$AgN{ O }_{ 3 }$$ solution and copper metal.

Solution

Question 8

It is a double displacement reaction since exchange of ions occurs between the two reactants.

It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.

It is a displacement reaction since chloride ions are replaced by sulphate ions.

It is a neutralisation reaction since an acid reacts with alkali to give a salt.

Solution

Question 9

Displacement reaction

Double displacement reaction

Combination reaction

Decomposition reaction

Solution

Question 10

$$Pb(NO_3)_2+2Nal=PbI_2+2NaNO_3$$

$$AgNO_3+HCl=AgCl +HNO_3$$

$$2Na+2H_2O=2NaOH+H_2$$

$$KNO_3+NaCl=KCl+NaNO_3$$

Solution

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