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Important Questions (1 Mark): Chemical Reactions & Equations - Class 10 MCQ


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20 Questions MCQ Test - Important Questions (1 Mark): Chemical Reactions & Equations

Important Questions (1 Mark): Chemical Reactions & Equations for Class 10 2024 is part of Class 10 preparation. The Important Questions (1 Mark): Chemical Reactions & Equations questions and answers have been prepared according to the Class 10 exam syllabus.The Important Questions (1 Mark): Chemical Reactions & Equations MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions (1 Mark): Chemical Reactions & Equations below.
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Important Questions (1 Mark): Chemical Reactions & Equations - Question 1
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Which of the following are exothermic reactions?

(i) Burning of coal.

(ii) Reaction of water with quicklime.

(iii) Respiration.

(iv) Evaporation of water.

Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 1

1) Burning of coal undergoes combustion reaction. Combustion reaction is a type of reaction in which chemical species experiences oxidation by undergoing a reaction with the oxidizing agent which results in the emission of energy in the form of heat. It is an exothermic process.

2) Quick lime is calcium oxide. It reacts with water to form calcium hydroxide. The reaction of water with quicklime releases a large amount of energy. Hence, this is an exothermic reaction.

3) Respiration is a series of exothermic reactions that occur in the mitochondria of living cells in order to release energy from food molecules. This energy can then be used to produce heat, for movement, growth, reproduction and active uptake.

4) Evaporation is endothermic because water molecules must absorb heat from the surroundings to increase their kinetic energy.Only evaporation of water is an endothermic reaction.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 2
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In the balanced equation

a Fe2O3 + b H2 → c Fe + d H2O

The values of a, b, c and d are the respectively:

Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 2

The balanced reaction can be written as follow:
Fe2O3 + 3H2 → 2Fe + 3H2O
Thus,
a→1, b→3, c→2, d→3.

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Important Questions (1 Mark): Chemical Reactions & Equations - Question 3
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Carbon dioxide turns lime water milky due to the formation of:

Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 3

Ca(OH)2(aq) + CO2 → CaCO3(s) + H2O
Lime turns water turns milky

Important Questions (1 Mark): Chemical Reactions & Equations - Question 4
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When a solution of barium chloride in water is added to an aqueous solution of sodium sulphate, the following happens:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 4

When barium chloride solution is added to sodium sulphate solution, then a white precipitate of barium sulphate is formed along with sodium chloride solution.
BaCl2 (aq) + Na2SO4(aq) → BaSO4 (s) + 2NaCl(aq)

Important Questions (1 Mark): Chemical Reactions & Equations - Question 5
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The process of reduction involves ______.
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 5

The process of reduction involves gain of electrons.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 6
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In the reaction: 3MnO2 + 4Al → 3Mn + 2Al2O3
The oxidising agent is:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 6

MnO2 loses oxygen and therefore, gets reduced. Hence, it acts as an oxidising agent.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 7
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When magnesium ribbon is burnt in air, the ash formed is:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 7

Ash is white powder of magnesium oxide.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 8
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The gas produced on addition of dilute sulphuric acid on powdered zinc is:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 8

Zn + H2SO4(dil) → ZnSO4 + H2

Important Questions (1 Mark): Chemical Reactions & Equations - Question 9
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When in the blue solution of copper sulphate, zinc strip is dipped, after some time the colour changes to:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 9

Zn + CuSO4(aq) → Cu + ZnSO4
Blue Colourless

Important Questions (1 Mark): Chemical Reactions & Equations - Question 10
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In the reaction: SO2(g) + 2H2S(g) → 2H2O(l) + S (s)
The reducing agent is:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 10

H2S gets oxidised and hence it is a reducing agent.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 11
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A white precipitate can be formed when dil H2SO4 is added to aqueous solution of:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 11

BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq)
white ppt.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 12
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When a solution of barium chloride in water is added to an aqueous solution of sodium sulphate, the following happens :
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 12

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)
white ppt

Important Questions (1 Mark): Chemical Reactions & Equations - Question 13
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The formula of rust is:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 13

Rust is Fe3O3. x H2O

Important Questions (1 Mark): Chemical Reactions & Equations - Question 14
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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?
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 14

Pb(CH3COO)3 + 3KI → PbI3 + 3CH3COOK

Important Questions (1 Mark): Chemical Reactions & Equations - Question 15
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Which one of the following four metals would be displaced from the solution of its salt by other three metals ?
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 15

Silver because it is the least reactive among these metals.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 16
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Which is the reducing agent in the reaction ?

ZnO + C → Zn + CO
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 16

C gets oxidised to CO and hence is a reducing agent.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 17
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The values of a, b, c and d in the balanced chemical equation, a BaCl2 + b Al2(SO4)3 → c AlCl3 + d BaSO4 are:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 17

3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4

Important Questions (1 Mark): Chemical Reactions & Equations - Question 18
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The formulae of quick lime and limestone are respectively:
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 18

Quick lime is CaO and limestone is CaCO3.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 19
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............ is a process in which there is loss of electrons.
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 19

Oxidation is a process that involves the loss of electrons.

Important Questions (1 Mark): Chemical Reactions & Equations - Question 20
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Which of the following statements about the given reaction are correct?
3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)

(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
Detailed Solution for Important Questions (1 Mark): Chemical Reactions & Equations - Question 20

The substance which oxidises the other substance is called oxidising agent. So, water is an oxidising agent.

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