Chemical Reactions and Equations Test

Result

Chemical Reactions and Equations Test - 24

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Identify the type of chemical reaction.
$$CaO(s) + SiO_{2}(s) \rightarrow CaSiO_{3}(s)$$

A
Displacement reaction

B
Decomposition reaction

C
Reduction reaction

D
Combination reaction

Solution

Calcium oxide $$(CaO)$$ combines with silicon dioxide ($$ SiO_{2}$$) to form a new product as calcium silicate ($$CaSiO_{3}$$). This is a combination reaction.
Question 2
1 / -0

Write the balanced equation for the reaction for the following statement:
Mg burns in presence of air.

A
$$Mg(s)+O_2(g) \rightarrow MgO_{2}(s)$$

B
$$2Mg(s)+2O(g) \rightarrow 2MgO(s)$$

C
$$2Mg(s)+O_2(g) \rightarrow 2MgO(s)$$

D
$$Mg(s)+O_2(g) \rightarrow MgO(s)$$

Solution

When $$Mg$$ burns with oxygen gas, it undergoes the process of oxidation, and magnesium oxide is formed.

Balanced equation is:
$$2Mg(s)+O_2(g) \rightarrow 2MgO(s)$$
Question 3
1 / -0

Identify the type of chemical reaction.
$$TiCl_{4}(l) + Mg(s) \rightarrow Ti(s) + MgCl_{2}(s)$$

A
Synthesis reaction

B
Displacement reaction

C
Precipitation reaction

D
None of these

Solution

Titanium tetrachloride ($$TiCl_{4}$$) reacts with magnesium $$(Mg)$$ to form titanium $$(Ti)$$ and magnesium chloride($$MgCl_{2}$$). It is a displacement reaction, as the more active magnesium displaces titanium in titanium chloride. The balanced equation can be written as:
$$TiCl_{4}(l) + 2Mg(s) \rightarrow Ti(s) + 2MgCl_{2}(s)$$
Question 4
1 / -0

Complete the missing components/variables given as $$x$$ in the following reactions:
$$CaCO_{3}(s) \xrightarrow{x} CaO(s) + CO_{2}(g)$$

A
$$x = Heat$$

B
$$x = Catalyst$$

C
$$x = O_{2}$$

D
None of these

Solution

Calcium carbonate on heating decomposes to form calcium oxide(quick lime) and carbon dioxide. The equation for this thermal decomposition reaction can be written as:
$$CaCO_{3} \overset{heat}{\rightarrow} CaO + CO_{2}$$
Therefore, $$x$$ in the above reaction is heat.
Question 5
1 / -0

Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Identify the type of reaction.

A
Combination reaction

B
Displacement reaction

C
Double displacement reaction

D
Thermal decomposition reaction

Solution

Ferrous sulphate on heating decomposes to produce the ferric oxide, sulphur dioxide and sulphur trioxide.

The balanced equation for this thermal decomposition reaction can be written as:

$$2FeSO_{4}(s) \overset{heat}{\rightarrow} Fe_{2}O_{3}(s) + SO_{2}(g) + SO_{3}(g)$$
Question 6
1 / -0

Which of the following reactions is an example of endothermic reaction?

A
Burning of a candle

B
Freezing of water into ice cubes

C
Evaporation of liquid water to form water vapour

D
Acid-base neutralization reaction

Solution

The term endothermic describes a process or a reaction in which the system absorbs energy in the form of heat whereas, in the case of an exothermic process, energy in the form of heat is released.

Burning of a candle, freezing of water, and acid-base neutralization are all exothermic in nature as heat is released during these reactions whereas, evaporation of water to form water vapor is an endothermic reaction because it requires heat to be absorbed by the liquid state to change to its gaseous state.
Question 7
1 / -0

Which of the following is a decomposition reaction?

A
$$NaOH + HCl \rightarrow NaCl + H_{2}O$$

B
$$NH_{4}CNO \rightarrow H_{2}N CO NH_{2}$$

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

D
$$H_{2} + I_{2} \rightarrow 2HI$$

Solution

A decomposition reaction is one in which a reactant breaks down into simpler products. Option C is an example of a decomposition reaction.
Question 8
1 / -0

A magnesium ribbon is burnt in oxygen to give a white compound $$X$$ accompanied by the emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound $$Y$$. Write the chemical formula of $$X$$ and $$Y$$:

A
$$x \rightarrow MgO ; y\rightarrow MgN$$

B
$$x \rightarrow 2MgO ; y\rightarrow Mg_{2}N_{3}$$

C
$$x \rightarrow MgO ; y\rightarrow Mg_{3}N_{2}$$

D
None of these

Solution

Magnesium ribbon burns in oxygen($$O_{2}$$) to form magnesium oxide ($$MgO$$).

$$2Mg + O_{2} \rightarrow 2MgO$$

Therefore $$X$$ is $$MgO$$.

Burning magnesium ribbon reacts with nitrogen($$N_{2}$$) to form
magnesium nitride($$Mg_{3}N_{2}$$).

$$3Mg + N_{2} \rightarrow Mg_{3}N_{2}$$

Therefore, $$Y$$ is $$Mg_{3}N_{2}$$

Hence the correct option is C.
Question 9
1 / -0

Identify the type of chemical reaction.
$$H_{2}O_{2}(l) \xrightarrow{U V} H_{2}O(l)+O_{2}(g)$$

A
Neutralization reaction

B
Combination reaction

C
Decomposition reaction

D
Double Displacement reaction

Solution

Hydrogen peroxide ($$H_{2}O_{2}$$) decomposes in the presence of ultraviolet rays to give water ($$H_{2}O$$) and oxygen ($$O_{2}$$). The balanced equation for this decomposition reaction can be written as:
$$2H_{2}O_{2}(l) \overset{UV}{\rightarrow} 2H_{2}O(l) + O_{2}(g)$$
Question 10
1 / -0

A chemical reaction in which heat is evolved is called a/an:

A
exothermic reaction

B
endothermic reaction

C
combination reaction

D
decomposition reaction

Solution

A reaction in which heat is released is called an exothermic reaction.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Chemical Reactions and Equations Test - 24

Result

Chemical Reactions and Equations Test - 24

Score

-

Rank

-

SHARING IS CARING

Question 1

Displacement reaction

Decomposition reaction

Reduction reaction

Combination reaction

Solution

Question 2

$$Mg(s)+O_2(g) \rightarrow MgO_{2}(s)$$

$$2Mg(s)+2O(g) \rightarrow 2MgO(s)$$

$$2Mg(s)+O_2(g) \rightarrow 2MgO(s)$$

$$Mg(s)+O_2(g) \rightarrow MgO(s)$$

Solution

Question 3

Synthesis reaction

Displacement reaction

Precipitation reaction

None of these

Solution

Question 4

$$x = Heat$$

$$x = Catalyst$$

$$x = O_{2}$$

None of these

Solution

Question 5

Combination reaction

Displacement reaction

Double displacement reaction

Thermal decomposition reaction

Solution

Question 6

Burning of a candle

Freezing of water into ice cubes

Evaporation of liquid water to form water vapour

Acid-base neutralization reaction

Solution

Question 7

$$NaOH + HCl \rightarrow NaCl + H_{2}O$$

$$NH_{4}CNO \rightarrow H_{2}N CO NH_{2}$$

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

$$H_{2} + I_{2} \rightarrow 2HI$$

Solution

Question 8

$$x \rightarrow MgO ; y\rightarrow MgN$$

$$x \rightarrow 2MgO ; y\rightarrow Mg_{2}N_{3}$$

$$x \rightarrow MgO ; y\rightarrow Mg_{3}N_{2}$$

None of these

Solution

Question 9

Neutralization reaction

Combination reaction

Decomposition reaction

Double Displacement reaction

Solution

Question 10

exothermic reaction

endothermic reaction

combination reaction

decomposition reaction

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.