MCQ Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 1

If you pour a few drops of petrol on your palm, it will feel cool as the petrol evaporates. This change is a/an:

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endothermic reaction
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exothermic reaction
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combustion reaction
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decomposition reaction

Complete the chemical reaction

M g (s) + H_{2} S O_{4} (a q) \to

$Mg(s)+H_2SO_4(aq)\rightarrow$ ?

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$MgSO_3+H_2O$
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$MgSO+H_2O+O_2$
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$MgSO_4+H_2$
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No reaction

Explanation

Magnesium reacts with

H_{2} S O_{4}

$H_2SO_4$ to form magnesium sulphate

(M g S O_{4})

$(MgSO_4)$ and hydrogen gas.

M g (s) + H_{2} S O_{4} (a q) \to M g S O_{4} + H_{2}

$Mg(s)+H_2SO_4(aq)\rightarrow MgSO_4+H_2$

Hence, the correct option is C.

In a balanced chemical reaction, the electric charge and total number of moles before reaction and after the reaction are :

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conserved
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not same
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different
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None of these

Which information is not conveyed by a balanced chemical equation?

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Physical state of reactants and products
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Symbols and formula of all the substance involved in a particular reaction
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Number of atoms/molecule of the reactants and products formed
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Whether a particular reaction is actually feasible or not

Explanation

A balanced chemical equation states the physical state of reactants and products. Symbols of elements and formula of compounds and numbers of atoms/molecules formed in the reaction but does not tell about the feasibility of the reaction.

Hence, option

D

$D$ is correct.

If hydrogen is added to a compound (or an element ) in a chemical reaction, the reaction is known by which reaction?

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Oxidation
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Reduction
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Decomposition
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Redox

Explanation

Reduction reaction:

$\text{Reduction reaction:}$ A chemical reaction in which hydrogen is added or oxygen is removed from an element, molecule or compound is called a reduction reaction.

L e a d S u l p h a t e + A m m o n i u m H y d r o x i d e \to A m m o n i u m S u l p h a t e + L e a d H y d r o x i d e

$Lead\ Sulphate + Ammonium\ Hydroxide \rightarrow Ammonium\ Sulphate + Lead\ Hydroxide$

Identify the type of reaction.

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Decomposition reaction
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Double displacement reaction
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Displacement reaction
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Neutralization reaction

Explanation

Reaction:

P b S O_{4} + 2 N H_{4} O H \to P b (O H)_{2} + (N H_{4})_{2} S O_{4}

$PbSO_4 +2NH_4OH \rightarrow Pb(OH)_2 +(NH_4)_2SO_4$

In this reaction, two reactants exchange their ions to form new compounds. This is a double displacement reaction.

Which of the following is not a decomposition reaction?

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$CaCO_3 \rightarrow CaO + CO_{2}$
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$2KClO_{3} \rightarrow 2KCl + 3O_{2}$
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$2NaNO_{3} \rightarrow 2NaNO_{2} + O_{2}$
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$H_{2} + Cl_{2} \rightarrow 2HCl$

Explanation

Decomposition is a kind of reaction where a single substance breaks into two or more products.

So, options

A, B, C

$A,B,C$ are decomposition reaction.

Correct option is

D

$D$ .

In the reaction,

Z n + N a N O_{3} + N a O H \to N a_{2} Z n O_{2} + N H_{3} + H_{2} O

$Zn+NaNO_{3}+NaOH\rightarrow Na_{2}ZnO_{2}+NH_{3}+H_{2}O$

The molar coefficients of Zn and

N a N O_{3}

$NaNO_{3}$ are:

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1 and 4 respectively
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4 and 1 respectively
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1 and 8 respectively
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8 and 1 respectively

Select the correct statement(s) about chemical reaction in a closed container.

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The total mass remains conserved.
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The total moles of molecules remains conserved.
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Total mass of atoms remains conserved
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The total mass of molecules may change.

Identify the combination reactions in the following:

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$NH_3+HCl\rightarrow NH_4Cl$
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$NaCl+KOH\rightarrow NaOH+KCl$
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$2CO+O_2\rightarrow 2CO_2$
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$Cu(OH)_2\xrightarrow {heat} CuO+H_2O$

Rusting of iron takes place only when both ...................... and ...................... are present.

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oxygen, moisture
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oil, sand
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sand, water
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none of the above

Reaction in which oxygen is added to the substance is called _________ reaction.

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oxidation
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reduction
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addition
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None of these

Explanation

The reaction in which oxygen is added or hydrogen is removed is known as an oxidation reaction.

The reaction in which oxygen is lost or hydrogen is gained is known as a reduction reaction.

So the correct option is

$A$ .

When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen.

$2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2+O_2$
The reaction is an example of:

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combination reaction
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decomposition reaction
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double decomposition reaction
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displacement reaction

Explanation

$2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2+O_2$

Here a single reactant is getting decomposed to form different compounds. Hence, it is a decomposition reaction.

Which of the following is not an example of single displacement reaction?

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$CuO+H_2\rightarrow H_2O+Cu$
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$Zn+CuSO_4\rightarrow ZnSO_4+Cu$
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$AgNO_3+NaCl\rightarrow AgCl+NaNO_3$
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$Zn+2HCl\rightarrow ZnCl_2+H_2$

Explanation

$\displaystyle AgNO_3+NaCl\rightarrow AgCl+NaNO_3$ is not an example of single displacement reaction.

It is an example of a double displacement reaction. It is a chemical process involving the exchange of bonds between two non-reacting chemical species.

Hence, option

$\text{C}$ is correct.

A Science teacher wrote

$3$ statements about rancidity:

(i) When fats and oils are reduced, they become rancid.
(ii) In chips packet, rancidity is prevented by oxygen.
(iii) Rancidity is prevented by adding antioxidants.

Select the correct option.

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(i)
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(ii) and (iii)
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(iii)
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(i), (ii) and (iii)

Which one of the following would the following result in a displacement reaction?

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Iron with magnesium chloride
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Magnesium with iron chloride
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Iron with Zinc Sulphate
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Gold with silver nitrate

State true or false.

In a chemical equation, the products are written on the left-hand side and the reactants on the right-hand side with an arrow in between.

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True
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False

Explanation

It is the convention to place the reactants on the left side of a chemical equation and the products on the right side.

The arrow between the reactants and products should point from left to right or if the reaction is proceeding both ways, point in both directions.

Hence, it is a false statement.

Correct statement should be:

In a chemical equation, the

$reactants$ are written on the left-hand side and the

$products$ on the right-hand side with an arrow in between.

Reactants

$\rightarrow$ Products

Identify the product(s) which will be formed by using the information provided about the reactants:

$Mg(s)+2HCl \rightarrow$

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$Mg{Cl}_{2}+H$
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$MgH_2+{Cl}_{2}$
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$Mg{Cl}_{3}+H_2$
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$Mg{Cl}_{2} + H_2$
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$Mg+H_2+{Cl}_{2}$

Explanation

$Mg + 2HCl \rightarrow MgCl_2 + H_2$

Magnesium metal on reaction with hydrochloric acid gives magnesium chloride and hydrogen gas.

$Al_2(SO_4)_3(aq)+3 Ca(OH)_2(aq)\rightarrow 2 Al(OH)_3(aq) + 3CaSO_4(s)$
The given reaction is an example of:

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Combination reaction
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Double displacement reaction
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Decomposition reaction
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Combustion reaction.

Name the type of following chemical reaction.

$2H_2O_2 \rightarrow 2H_2O + O_2$

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Displacement
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Combination
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Synthesis
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Decomposition

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.

$2H_2O_2 \rightarrow 2H_2O + O_2$

Which of the following reaction is a double displacement reaction?

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AlCl $_3$ + 3KOH $\rightarrow$ Al(OH) $_3$ + 3KCl
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Zn + H $_2$ SO $_4$ $\rightarrow$ ZnSO $_4$ + H $_2$
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2CO + O $_2$ $\rightarrow$ 2CO $_2$
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N $_2$ + O $_2$ $\rightarrow$ 2NO

Study the given figure carefully.

Which of the following reactions explains the above change most appropriately?

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$ZnSO_4 + Cu \rightarrow CuSO_4 + Zn$
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$CuSO_4 + Fe \rightarrow FeSO_4 + Cu$
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$FeSO_4 + Cu \rightarrow CuSO_4 + Fe$
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$CuSO_4 + Zn \rightarrow ZnSO_4 + Cu$

Explanation

The blue coloured solution is

$CuSO_4$ solution. Iron

$(Fe)$ is more reactive than copper

$(Cu)$ . So,

$Fe$ displaces

$Cu$ from the

$CuSO_4$ solution and forms

$FeSO_4$ solution which is green in color. Brown-red deposition in a test tube is of copper. Such types of reactions are called displacement reactions.

$Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe$
The above reaction is an example of

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Combination reaction
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Double displacement reaction
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Decomposition reaction
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Displacement reaction

Which of the following correctly represents a balanced chemical equation?

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$2Pb(NO_3)_2(s)\rightarrow 2PbO(s)+4NO_2(g)+O_2(g)$
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$Pb(NO_3)_2(s)\rightarrow 2PbO(s)+4NO_2(g)+O_2(g)$
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$Pb(NO_3)_2(s)\rightarrow PbO(s)+4NO_2(g)+O_2(g)$
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$Pb(NO_3)_2(s)\rightarrow 2PbO(s)+NO_2(g)+O_2(g)$

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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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Assertion is correct but Reason is incorrect
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Both Assertion and Reason are incorrect

Explanation

$\textbf{Correct option:}$ (C)

$\textbf{Explanation :}$

$\bullet$ A redox reaction is one which involves both oxidation and reduction reaction simultaneously.

$\bullet$ In this reaction the $Cl^{-}$ in $HCl$ is oxidised to $Cl_2$ while the $Mn^{4+}$ in $MnO_2$ is reduced to $Mn^{2+}$ in $MnCl_2$ .

$\bullet$ So, the assertion is correct but Reason is incorrect.

$\textbf{Conclusion:}$

Hence, the correct option is (C).

What happens when a piece of zinc metal is added to copper sulphate solution?

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Decomposition reaction
0%
Displacement reaction
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Double displacement reaction
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Precipitation reaction

Explanation

When zinc metal is added to a solution of copper sulphate (

$CuSO_{4}$ ), the blue colour of the latter changes to colourless as zinc sulphate (

$ZnSO_{4}$ ) is formed.

In this displacement reaction, zinc being more active metal than copper displaces it to form zinc sulphate, as shown below:

$Zn(s) + CuSO_{4}(aq) \rightarrow ZnSO_{4}(aq) + Cu(s)$
(blue) (colourless)

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of:

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A combination reaction
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A displacement reaction
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A decomposition reaction
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A double displacement reaction

Explanation

A double displacement reaction is a type of reaction where part of one reactant is replaced by part of another reactant.

$CuSO_4 + H_2S \rightarrow CuS + H_2SO_4$

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

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Lead sulphate (insoluble)
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Lead acetate
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Ammonium nitrate
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Potassium sulphate

Explanation

$2KI(aq) + Pb(NO_{3})_{2}(aq) \rightarrow PbI_{2}(s) + 2KNO_{3}$
In the above double displacement reaction, potassium Iodide(KI) and lead nitrate (

$Pb(NO_{3})_{2}$ ) dissociate in their aqueous states to form ions. The lead (

$Pb^{2+}$ ) ions combine with the iodide (

$I^{-}$ ) ions to form precipitates of lead iodide (

$PbI_{2}$ ). If Lead sulphate is used in place of lead nitrate, no precipitates of lead iodide will be formed, because lead sulphate being insoluble in water does not give

$Pb^{2+}$ ions which can combine with

$I^{-}$ to form

$PbI_{2}$ . On the other hand, lead acetate dissociates in aqueous state to give

$Pb^{2+}$ ions and

$CH_{3}COO^{-}$ ions . Therefore potassium iodide combines with lead acetate to form precipitates of lead iodide and potassium acetate.

$2KI(aq) + Pb(CH_{3}COO)_{2}(aq) \rightarrow PbI_{2}(s) + 2CH_{3}COOK$

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

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$2H_{2}(l)+O_{2}(l) \rightarrow 2H_{2}O(g)$
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$2H_{2}(g) + O_{2}(l) \rightarrow 2H_{2}O(l)$
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$2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$
0%
$2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(g)$

Explanation

Hydrogen and oxygen are correctly mentioned in the gaseous state and the product water in a liquid state.

$H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$

Hence, option C is correct.

Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride. This is a :

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decomposition reaction
0%
combination reaction
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displacement reaction
0%
double displacement reaction

Explanation

Reaction of magnesium with nitrogen is a combination reaction as these two reactants (

$Mg$ and

$N_{2}$ ) combine together to form a single product as magnesium nitride (

$Mg_{3}N_{2}$ ). The equation can be written as:

$3Mg(s) + N_{2}(g) \rightarrow Mg_{3}N_{2}(s)$

CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 1 - 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 1 - MCQExams.com

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Practice Class 10 Chemistry Quiz Questions and Answers

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