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Science M.C.Q

Chemical Reactions and Equations · MP Board (MPBSE) STD 10 (Madhya Pradesh - English Medium). 18 questions.

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18 questions · timed · auto-graded

MCQ 11 Mark
Which of the following are combination reactions?
  1. $2\text{KCIO}_3\xrightarrow{\text{Heat}}2\text{KCI}+3\text{O}_2$
  2. $\text{MgO}+\text{H}_2\text{O}\rightarrow\text{Mg(OH)}_2$
  3. $4\text{AI + 3O}_2\rightarrow\ 2\text{AI}_2\text{O}_3$
  4. $\text{Zn + FeSO}_4\rightarrow\text{ZnSO}_4+\text{Fe}$
  • A
    Both $1$ and $3$
  • B
    Both $3$ and $4$
  • C
    Both $2$ and $4$
  • ✓
    Both $2$ and $3$
Answer
Correct option: D.
Both $2$ and $3$
Combination reactions form a new product with the combination of more than one reactant molecules.
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MCQ 21 Mark
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?
  1. Displacement reaction.
  2. Precipitation reaction.
  3. Combination reaction.
  4. Double displacement reaction.
  • A
    Only $1$
  • B
    Only $2$
  • C
    Only $4$
  • ✓
    $2$ and $4$
Answer
Correct option: D.
$2$ and $4$
Double displacement reaction involves displacement of caption and anions of two different compounds. In given reaction, precipitate of barium sulphate is formed.
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MCQ 31 Mark
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
  • A
    $2H_2(l) + O_2(l) \rightarrow 2H_2O(g)$
  • B
    $2H_2(g) + O_2(l) \rightarrow 2H_2O(l)$
  • ✓
    $2H_2(g) + O_2(g) \rightarrow 2H_2O(l)$
  • D
    $2H_2(g) + O_2(g) \rightarrow 2H_2O(g)$
Answer
Correct option: C.
$2H_2(g) + O_2(g) \rightarrow 2H_2O(l)$
Explanation: At room temperature, hydrogen and oxygen are available as gas, while water Is available as liquid.
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MCQ 41 Mark
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?
  • A
    Lead sulphate (insoluble).
  • ✓
    Lead acetate.
  • C
    Ammonium nitrate.
  • D
    Potassium sulphate.
Answer
Correct option: B.
Lead acetate.
We need a source of lead for making lead iodide, hence options (c) and (d) are ruled out. Lead sulphate is insoluble, so it cannot be used.
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MCQ 51 Mark
A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?
  • ✓
    $KMnO _4$ is an oxidising agent, it oxidises $FeSO _4$
  • B
    $FeSO _4$ acts as an oxidising agent and oxidises $KMnO _4$
  • C
    The colour disappears due to dilution, no reaction is involved
  • D
    $KMnO _4$ is an unstable compound and decomposes in presence of $FeSO _4$ to a colourless compound.
Answer
Correct option: A.
$KMnO _4$ is an oxidising agent, it oxidises $FeSO _4$
 Potassium permanganate $(KMnO_4)$ acts as good oxidizing agent in acidic medium and reduces itself to manganese captions, $Mn^{2+}$. It oxidizes $FeSO_4 to Fe_2(SO_4)_3​​​​​​​$​​​​​​​
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MCQ 61 Mark
Three beakers labelled as $A, B$ and $C$ each containing $25\ mL$ of water were taken. A small amount of $\text{NaOH}$, anhydrous $CuSO_4$ and $\text{NaCl}$ were added to the beakers $A, B$ and $C$ respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers $A$ and $B$, whereas in case of beaker $C$, the temperature of the solution falls. Which one of the following statement $(s)$ is $($are$)$ correct?
  1. In beakers $A$ and $B$, exothermic process has occurred.
  2. In beakers $A$ and $B$, endothermic process has occurred.
  3. In beaker $C$, exothermic process has occurred.
  4. In beaker $C$, endothermic process has occurred.
  • A
    Only $1$
  • B
    Only $2$
  • ✓
    $1$ and $4$
  • D
    $2$ and $3$
Answer
Correct option: C.
$1$ and $4$
For an exothermic reaction, heat releases during reaction so temperature increases whereas endothermic reactions proceed with absorption of heat which decrease the temperature of reaction.
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MCQ 71 Mark
Which of the following is not a physical change?
  • A
    Boiling of water to give water vapour.
  • B
    Melting of ice to give water.
  • C
    Dissolution of salt in water.
  • ✓
    Combustion of Liquefied Petroleum Gas (LPG).
Answer
Correct option: D.
Combustion of Liquefied Petroleum Gas (LPG).

Combustion of any substance is a chemical change because new substance is formed after combustion.

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MCQ 81 Mark
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is $($are$)$ true about slaking of lime and the solution formed?
  1. It is an endothermic reaction.
  2. It is an exothermic reaction.
  3. The $\ce{pH}$ of the resulting solution will be more than seven.
  4. The $\ce{pH}$ of the resulting solution will be less than seven.
  • A
    $1$ and $2$
  • ✓
    $2$ and $3$
  • C
    $1$ and $4$
  • D
    $3$ and $4$
Answer
Correct option: B.
$2$ and $3$
Slaking of lime is an exothermic reaction which is evident from liberation of heat. Oxides and hydroxides of metals are alkaline. Hence, $\ce{pH}$ of the resulting solution will be more than $7.$
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MCQ 91 Mark
Which of the following is $($are$)$ an endothermic process $\ce{(es)}\ ?$
  1. Dilution of sulphuric acid.
  2. Sublimation of dry ice.
  3. Condensation of water vapours.
  4. Evaporation of water.
  • A
    $1$ and $3$
  • B
    $2$ Only
  • C
    $3$ Only
  • ✓
    $2$ and $4$
Answer
Correct option: D.
$2$ and $4$
When a solid change into gas or a liquid change into gas, it happens because of absorption of heat. Hence, these are endothermic processes.
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MCQ 101 Mark
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
  • A
    1 : 1
  • ✓
    2 : 1
  • C
    4 : 1
  • D
    1 : 2
Answer
Correct option: B.
2 : 1
The balance chemical equation for electrolysis of water is;
$2\text{H}_2\text{O}(1)\xrightarrow[]{\text{Electric current}}2\text{H}_2(\text{g})+\text{O}_2(\text{g})$
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MCQ 111 Mark
Which one of the following processes involve chemical reactions?
  • A
    Storing of oxygen gas under pressure in a gas cylinder.
  • B
    Liquefaction of air.
  • C
    Keeping petrol in a china dish in the open.
  • ✓
    Heating copper wire in presence of air at high temperature.
Answer
Correct option: D.
Heating copper wire in presence of air at high temperature.

Chemical changes involve formation of new compounds from one of more substances. Reaction of copper wire with oxygen forms copper oxide.

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MCQ 121 Mark
Which of the following are exothermic processes?
  1. Reaction of water with quick lime.
  2. Dilution of an acid.
  3. Evaporation of water.
  4. Sublimation of camphor $($crystals$).$
  • ✓
    $1$ and $2$
  • B
    $2$ and $3$
  • C
    $1$ and $4$
  • D
    $3$ and $4$
Answer
Correct option: A.
$1$ and $2$
Exothermic process are chemical process which take place with the release of heat. Enormous amount of heat energy is released when dilution of acid takes place and when water reacts with quick lime.
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MCQ 131 Mark
Which among the following statement $(s)$ is $($are$)$ true? Exposure of silver chloride to sunlight for a long duration turns grey due to :
  1. The formation of silver by decomposition of silver chloride.
  2. Sublimation of silver chloride.
  3. Decomposition of chlorine gas from silver chloride.
  4. Oxidation of silver chloride.
  • ✓
    $1$ Only
  • B
    $1$ and $3$
  • C
    $2$ and $3$
  • D
    Only $4$
Answer
Correct option: A.
$1$ Only
In the presence of sunlight, $\ce{AgCl}$ decompose to form grayish white silver metal and releases chlorine gas.
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MCQ 141 Mark
Which of the following statements about the given reaction are correct?
$\ce{3Fe(s) + 4H_2O(g) \rightarrow Fe_3O_4(s) + 4H_2(g)}$
  1. Iron metal is getting oxidised.
  2. Water is getting reduced.
  3. Water is acting as reducing agent.
  4. Water is acting as oxidising agent.
  • A
    $1, 2$ and $3$
  • B
    $3$ and $4$
  • ✓
    $1, 2$ and $4$
  • D
    $2$ and $4$
Answer
Correct option: C.
$1, 2$ and $4$
Oxygen is being added to iron, hence iron is getting oxidized. Oxygen is removed from water; hence water is getting reduced. Water is providing oxygen; hence water is the oxidizing agent.
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MCQ 151 Mark
The following reaction is an example of a :
$\ce{4NH_3(g) + 5O_2 (g) \rightarrow 4NO(g) + 6H_2O(g)}$
  1. Displacement reaction.
  2. Combination reaction.
  3. Redox reaction.
  4. Neutralisation reaction.
  • A
    $1$ and $4$
  • B
    $2$ and $3$
  • ✓
    $1$ and $3$
  • D
    $3$ and $4$
Answer
Correct option: C.
$1$ and $3$
A redox reaction is combination of oxidation $($removal of hydrogen$)$ and reduction $($addition of hydrogen$)$. Displacement reaction involves displacement of some part of a compound with other atom like H atoms of $\ce{NH_3}$ are displaced by oxygen.
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MCQ 161 Mark
Which among the following is $($are$)$ double displacement reaction $(s)\ ?$
  1. $\ce{Pb + CuCl_2 \rightarrow PbCl_2 + Cu}$
  2. $\ce{Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl}$
  3. $\ce{C + O_2 \rightarrow CO_2}$
  4. $\ce{CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O}$
  • A
    $1$ and $4$
  • ✓
    $2$ only
  • C
    $1$ and $2$
  • D
    $3$ and $4$
Answer
Correct option: B.
$2$ only
 In this reaction, sodium and barium are displacing each other from their respective salts. Hence, it is a double displacement reaction.
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MCQ 171 Mark
The following reaction is used for the preparation of oxygen gas in the laboratory$2\text{KCIO}_3\text{(s})\xrightarrow[\text{Catalyst}]{\text{Heat}}2\text{KCI(s)}+3\text{O}_2(\text{g})$
Which of the following statement(s) is (are) correct about the reaction?
  • ✓
    It is a decomposition reaction and endothermic in nature.
  • B
    It is a combination reaction.
  • C
    It is a decomposition reaction and accompanied by release of heat.
  • D
    It is a photochemical decomposition reaction and exothermic in nature.
Answer
Correct option: A.
It is a decomposition reaction and endothermic in nature.

Potassium chlorate decomposes to give Potassium chloride and oxygen, hence it is a decomposition reaction. Heat is being supplied to this reaction, so it is an endothermic reaction.

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MCQ 181 Mark
Which of the following gases can be used for storage of fresh sample of an oil for a long time?
  • A
    Carbon dioxide or oxygen.
  • B
    Nitrogen or oxygen.
  • C
    Carbon dioxide or helium.
  • ✓
    Helium or nitrogen.
Answer
Correct option: D.
Helium or nitrogen.

 Inert gases like Helium and Nitrogen can be used for storage of food items as they prevent the oxidation of food items.

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