MCQ Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 3

A g N O_{3} (a q) + N a C l (a q) \to A g C l (s) + N a N O_{3} (a q)

$AgNO_3(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_3(aq)$

Above reaction is :

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precipitation reaction
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double displacement reaction
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combination reaction
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redox reaction

1.0g of

$CaCO_3$ is taken in a test tube. On heating it over a flame, a colorless gas is evolved. The reaction is called:

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decomposition reaction
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displacement reaction
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combination reaction
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double displacement reaction

Explanation

Calcium carbonate on heating produces calcium oxide and carbon dioxide.

$CaCO_3\rightarrow CaO+CO_2$

In the reaction, we can clearly see that there is neither any displacement of atoms nor two reactants are combining to form a product. So, the given reaction is not a displacement or combination reaction. However, in the reaction, the calcium carbonate breaks down into two simple products.

The type of reaction in which a compound breaks down into simple components under suitable conditions is a decomposition reaction.

$2Mg + O_2 \rightarrow 2MgO$
The above reaction is an example of :

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decomposition reaction
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displacement reaction
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combination reaction
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oxidation reaction

Explanation

It is a combination reaction and an oxidation reaction where

$Mg$ is getting oxidized to form

$MgO.$

Hence options C and D are correct.

White silver chloride in sunlight turns to :

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grey
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yellow
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green
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red

Explanation

Sunlight carries a good amount of energy, which makes silver chloride (AgCl) decompose in silver (Ag) and chlorine. The metallic silver appears as very small 'flakes', essentially black, so these tiny black spots evenly distributed in the mass of white silver chloride makes it look grey.

$2AgCl\rightarrow 2Ag+Cl_2$

Identify the balanced chemical equation from the following:

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$SiCl_4+2H_2O\rightarrow SiO_2+4 HCl$
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$2NaOH+H_2O_2\rightarrow Na_2O_2+2H_2O$
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$6Be+3N_2\rightarrow 3Be_3N_2$
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$Al_2O_3+2NaOH\rightarrow NaAlO_2+H_2O$

Explanation

In a balanced chemical equation, the number of atoms on each side of the equation i.e. the reactant side and the product side should be balanced.

This means that no. of atoms on the reactant side is equal to the number of atoms on the product side.

In option

$C$ : no. of atoms of Be on reactant side = 6

no. of atoms of Be on product side = 9

In option

$D$ : no. of atoms of Al on reactant side = 2

no. of atoms of Be on product side = 1

Equation given in Option A and B are balanced.

Hence, the correct options are

$A$ &

$B$ .

Double displacement reactions are :

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$Mg + CuSO_4 \rightarrow MgSO_4 + Cu$
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$KOH + HNO_3\rightarrow H_2O + KNO_3$
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$Na_2S + 2HCI \rightarrow 2NaCl + H_2S$
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$BaCl_2+H_2SO_4 \rightarrow BaSO_4+2HCl$

Explanation

Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions. In double replacement reactions, the positive ions and negative ions switch their positions and form two new compounds or products.
Hence;

$KOH + HNO_3\rightarrow H_2O + KNO_3$

$Na_2S + 2HCI \rightarrow 2NaCl + H_2S$

$BaCl_2+H_2SO_4 \rightarrow BaSO_4+2HCl$
are double displacement reactions.

Which of the following is not a balanced equation?

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$Ca(OH)_2+CO_2 \rightarrow CaCO_3 + H_2 O$
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$Fe + CuSO_4 \rightarrow FeSO_4 + Cu$
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$KClO_{4}\overset{\Delta }{\rightarrow}KCl+2O_{2}$
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$Cu+2HNO_3 \rightarrow Cu(NO_3)_2+2NO+H_2O$

Explanation

The number of oxygen atoms on the reactant side is 6 and the number of oxygen atoms on the product side is 9 in option D. Hence, it is an unbalanced equation.

The balanced equation is:

$3Cu+8HNO_3 \rightarrow 3Cu(NO_3)_2+2NO +4H_2O$

Identify the following reactions as endothermic or exothermic.
(i)

$2NaHCO_3+ \text{energy}\longrightarrow Na_2CO_3+H_2O+CO_2$
(ii)

$2Mg+O_2\longrightarrow 2MgO+\text{energy}$

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(i) Exothermic (ii) Endothermic
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(i) Endothermic (ii) Exothermic
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(i) Exothermic (ii) Exothermic
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(i) Endothermic (ii) Endothermic

Balance the equation by providing the missing coefficients.

$.. C_2H_4(g)\quad+\quad ..O_2(g)\longrightarrow \quad.. CO_2(g)\quad+\quad.. H_2O(g)$

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1, 3, 2, 2
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2, 1, 3, 2
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3, 1, 2, 2
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3, 2, 1, 1

Explanation

Balance reaction is,

$C_2H_4(g)+3O_2(g)\longrightarrow 2CO_2(g)+2H_2O(g)$

$\text {Atoms Atoms on reactant side (LHS) Atoms on product side (RHS)}$

$\text {C 2 2}$

$\text {H 4 4}$

$\text {O 6 6}$

Here, coefficients are

$1,3,2,2$

Option

$A$ is correct.

Differentiate between an exothermic and an endothermic reaction.

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Endothermic releases heat and exothermic absorbs energy
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Exothermic releases heat and endothermic absorbs energy
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Hydrogen gas is evolved in exothermic but not in endothermic
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Hydrogen gas is evolved in endothermic but not in exothermic

Explanation

The exothermic reaction releases heat energy into the surrounding system. The heat energy is released because the total energy of the product is less than the total energy of the reaction. However, in the case of endothermic reactions, heat is absorbed from the surrounding.

Hence, the correct option is

$B$

What type of chemical reaction is it?

Calcium + oxygen

$\rightarrow$ Calcium oxide

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Displacement Reactions
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Decomposition Reactions
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Combination Reactions
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Neutralization Reactions

Explanation

Reaction:

$2Ca+O_2 \rightarrow 2CaO$

This is a combination reaction.

(i) Reaction between calcium oxide and water is a ...... reaction.
(ii) Action of strong heat on mercuric oxide is a ...... reaction.

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(i) decomposition (ii) combination
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(i) combination (ii) combination
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(i) combination (ii) decomposition
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(i) decomposition (ii) decomposition

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

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

Explanation

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.

$2HCl+{ Na }_{ 2 }{ S }_{ 2 }{ O }_{ x }\rightarrow yNaCl+SO_{ 2 }+S+{ H }_{ 2 }O$

Find the value of x and y.

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$x= 3, y= 2$
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$x= 2, y= 2$
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$x= 1, y= 2$
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$x= 3, y= 1$

Explanation

The balanced reaction is:

$2HCl+{ Na }_{ 2 }{ S }_{ 2 }{ O }_{ 3 }\rightarrow 2NaCl+SO_{ 2 }+S+{ H }_{ 2 }O$

On the reactant side, there are 2 Na atoms and 2 Cl atoms, so on the product side, there must be 2

$NaCl$ molecules.

On the product side, there are 3 oxygen atoms so on the reactant side, there must be 3 oxygen atoms.

Hence

$x=3$ and

$y=2$ .

Correct balanced equation from the following reactions is:

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$Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$
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$Al_4C_3 + 2H_2O \rightarrow 2Al(OH)_3 + 3CH_4$
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$2Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$
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$Al_4C_3 + 16H_2O \rightarrow 4Al(OH)_3 + CH_4$

Explanation

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.

$xFe+S\rightarrow FeS\\ FeS+2HCl\rightarrow { FeCl }_{ y }+{ H }_{ 2 }S$
Find the value of x and y.

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$x=1 , y=2$
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$x=2 , y=1$
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$x=1 , y=1$
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$x=4 , y=2$

Explanation

The values of x and y can be determined by just balancing the reaction.

By balancing the given reaction we get,

$Fe+S\rightarrow FeS$

$FeS+2HCl\rightarrow { FeCl }_{ 2 }+{ H }_{ 2 }S$

From the above-balanced equation, we get

$x=1$ and

$y=2$

Option A is correct.

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

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Formation of lead(II) bromide
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Decomposition of water
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Hydrogenation of oils
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None of these

Name the type of following chemical reaction.

$PbO_2 + SO_2 \rightarrow PbSO_4$

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Combination
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Displacement
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Double displacement
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Neutralisation

Explanation

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.

$PbO_2 + SO_2 \rightarrow PbSO_4$

On passing excess

$CO_2$ in aqueous solution of sodium carbonate, the substance obtained is :

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$NaOH$
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$NaHCO_3$
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$Na_2CO_3.10H_2O$
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$Na_2CO_3.H_2O$

Explanation

$Na_2 CO_3 + CO_2 + H_2O \rightarrow 2NaHCO_3$
Hence, sodium bicarbonate is formed on passing carbon dioxide in excess in aqueous solution of sodium carbonate. Hence, option B is the correct answer.

Correct balanced equation from the following reactions is :

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

Explanation

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

$\text{Atoms On reactant side (LHS) on the product side (RHS)}$

$\text {K 4 4}$

$\text {Cr 4 4}$

$\text{O 46 46}$

$\text{H 16 16}$

$\text {S 8 8}$

As the number of atoms on the reactant and product side is the same.

Hence, option

$C$ is correct.

The correct balanced equation from the following is :

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

Iron articles rust readily whereas steel which is also mainly made of iron will not undergo corrosion.

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True
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False

The reaction between carbon and oxygen can be represented as;

$C_{(s)} + O_{2(g)} \rightarrow CO_{2(g)} + heat$
In which of the following type(s), the above reaction can be classified?
I. Combustion reaction
II. Displacement reaction
III. Endothermic reaction
IV. Combination reaction

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(I) and (III)
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(I), (III) and (IV)
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(I) and (IV)
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(I) only

Explanation

The reaction

$C + O_2 \rightarrow CO_2$ is a chemical reaction.

It is an exothermic reaction and also oxidation. Exothermic because it releases heat and oxidation because the carbon atom forms a covalent bond with the oxygen.

It is a combustion reaction because combustion is the burning of a compound with the evolution of a considerable amount of heat energy. In this reaction,

$C$ (carbon) is burnt in

$O_2$ ( Oxygen) and releases heat energy. Therefore, this reaction is a combination reaction and a combustion reaction.

Thus, option " C" is correct.

Choose the correct balanced chemical reaction for the conversion of sulphur to sulphuric acid.

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$S+ \underset {(hot\ and\ conc.)} {HNO _3 } \rightarrow { H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ NO }_{ 2 }$
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$S+ \underset {(hot\ and\ conc.)} {6{ HNO }_{ 3 }}\rightarrow { H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 6NO }_{ 2 }$
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$2S+\underset {(hot\ and\ conc.)} {6{ HNO }_{ 3 }} \rightarrow 2{ H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 6NO }_{ 2 }$
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$2S+\underset {(hot\ and\ conc.)} {3{ HNO }_{ 3 }}\rightarrow 2{ H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 3NO }_{ 2 }$

Explanation

Sulphur reacts with nitric acid to form sulphuric acid.

$S+ \underset {(hot\ and\ conc)} {6{ HNO }_{ 3 }}\rightarrow { H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 6NO }_{ 2 }$

Hence, option B is correct.

Name the type of following chemical reaction.

$CaCO_3 \rightarrow CaO + CO_2$

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Combination
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Displacement
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Decomposition
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Synthesis

Explanation

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.

$CaCO_3 \rightarrow CaO + CO_2$

Select the wrong option about rancidity.

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Aerial oxidation of fats
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Aerial oxidation of oils
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Oils left in refrigerator gets rancid
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Chips exposed to air gets rancid

Which of the following pair will give displacement reaction?

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$NaCl$ solution and copper metal
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$MgCl_2$ solution and aluminium metal
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$FeSO_4$ solution and silver metal
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$AgNO_3$ solution and copper metal

Explanation

Copper metal is more reactive than silver metal so it can displace silver and can form copper nitrate.

$2{ AgNO }_{ 3 }+Cu\rightarrow { Cu\left( { NO }_{ 3 } \right) }_{ 2 }+2Ag$

What do you observe when

$H_2S$ gas is passed through cadmium chloride solution? Name the type of reaction:

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Synthesis
0%
Displacement
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Double displacement
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Neutralisation

Explanation

When

$H_2S$ gas i.e. hydrogen sulphide gas is passed through cadmium chloride solution, yellow colored precipitate of cadmium sulphide (CdS) is formed and aqueous hydrochloric acid (HCl) is formed.

$H_2S(g) + CdCl_2(aq) \rightarrow CdS(s) + 2HCl(aq)$

Name the type of following chemical reaction.

$KNO_3 + H_2SO_4 \rightarrow HNO_3 + KHSO_4$

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Displacement Reaction
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Double Displacement Reaction
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Combination Reaction
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Decomposition Reaction

Explanation

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

$KNO_3 + H_2SO_4 \rightarrow HNO_3 + KHSO_4$

Name the type of following chemical reaction.

$NH_4Cl \rightarrow NH_3 + HCl$

0%
Synthesis
0%
Combination
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Displacement
0%
Decomposition

Explanation

$NH_4Cl \rightarrow NH_3 + HCl$

CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 3 - MCQExams.com

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Practice Class 10 Chemistry Quiz Questions and Answers

CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 3 - MCQExams.com

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Practice Class 10 Chemistry Quiz Questions and Answers

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