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NCERT Solutions Class 10 Science Chapter 1 Chemical Reactions And Equations

Ncert Solutions for class 10 subject Science Chapter 1 Chemical Reactions And Equationsin pdf Best Free NCERT Solutions for class 1 to 12 in pdf NCERT Solutions, cbse board, Science, ncert Solutions for Class 10 Science, class 10 Science ncert solutions, Chemical Reactions And Equations, Class 10, ncert solutions chapter 1 Chemical Reactions And Equations, class 10 Science, class 10 Science ncert solutions, Science ncert solutions class 10, Ncert Solutions Class 10 Science Chapter 1 Chemical Reactions And Equations

In Text Question Chapter 1 Class 10 Science Chemical Reactions And Equations Ncert Solutions

NCERT Solutions Class 10 Chapter 1 Intext Questions in Text and Video Formate

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All Questions list
Answer :
Magnesium ribbon must be cleaned before burning in air so that the the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.Answers:

class 10 Chemical Reactions And Equations Science ncert solutions
Answers:

class 10 Chemical Reactions And Equations Science ncert solutionsAnswer:
(i)The substance ‘X’ which is used in white washing is calcium oxide or quick lime and its formula is CaO.
(i)The reaction involved is

class 10 Chemical Reactions And Equations Science ncert solutionsAnswer:
The chemical reaction involved in the electrolysis of water is class 10 Chemical Reactions And Equations Science ncert solutions

From the above reaction it is clear that the amount of hydrogen gas and the oxygen gas formed are always in the ratio of 2:1. Therefore the volume of gas collected in the first test tube is double the volume of the gas collected in second test tube.Answer:
When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes.
The reaction involved is

class 10 Chemical Reactions And Equations Science ncert solutionsAnswer:

class 10 Chemical Reactions And Equations Science ncert solutionsAnswer:
(i)The substance oxidised is sodium and the substance reduced is oxygen gas.
(ii) The substance oxidised is Hydrogen gas and the substance reduced is copper oxide.

Exercise Chapter 1 Class 10 Science Chemical Reactions And Equations Ncert Solutions

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Answer:
(i)

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Answer:
(d)

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Answer:
(a)

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Question 4. What is a balanced chemical equation? Why should chemical equations be balanced?
Answer:
If in a chemical equation the total number of atoms in the reactant side are equal to the total number of atoms in the product side then the chemical reaction is said to be balanced. For example

class 10 Chemical Reactions And Equations Science ncert solutions

The chemical reaction should be balanced show that it can follow the law of conservation of mass.

Answers:

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:
Balanced chemical equations are
class 10 Chemical Reactions And Equations Science ncert solutions
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class 10 Chemical Reactions And Equations Science ncert solutions


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Answer:
class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:
Exothermic Reaction:
A chemical reaction in which heat is given out is known as exothermic reaction. For example

class 10 Chemical Reactions And Equations Science ncert solutions

Endothermic Reaction: A chemical reaction in which heat energy is absorbed is known as endothermic reaction. For example

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:
Respiration is considered as an exothermic reaction because in respiration oxidation of glucose takes place which produces heat energy. This is shown in following chemical equation

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:
In Decomposition reaction a single substance decomposes to form two or more substances which is exact opposite of Combination reaction in which two or more reactants combine to form a single product that is why decomposition reactions called the opposite of combination reactions. For examples
Decomposition reaction:

class 10 Chemical Reactions And Equations Science ncert solutions

Combination Reaction:

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:

class 10 Chemical Reactions And Equations Science ncert solutions
In displacement reaction a more reactive element replaces a less reactive element from its compound while in double displacement reaction exchange of ions takes place for example

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Answer:

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:
The chemical reaction in which a white coloured substance which is insoluble in water (precipitate) is formed then it is known as precipitation reaction

class 10 Chemical Reactions And Equations Science ncert solutions

In this reaction Barium sulphate is a white colour precipitate and it is insoluble in water.

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Answer:
Oxidation Reaction:
It is a chemical reaction in which gain of oxygen or loss of hydrogen takes place. For example in the first reaction copper is oxidised to become copper oxide and in second Magnesium is oxidised to become Magnesium Oxide.

class 10 Chemical Reactions And Equations Science ncert solutions

Reduction Reaction: It is a chemical reaction in which loss of oxygen or gain of hydrogen takes place. For example in the first reaction copper oxide is reduced to become copper and in second Zinc Oxide is reduced to become Zinc.

class 10 Chemical Reactions And Equations Science ncert solutions

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Answer:
The shiny brown coloured element is copper and the black coloured compound formed is Copper oxide

class 10 Chemical Reactions And Equations Science ncert solutions


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Answer:
Iron articles are painted to prevent them from rusting. After painting iron surface does not come in contact with moisture and air which cause rusting.

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Answer: Oil and fat containing food items flushed with nitrogen because nitrogen acts as an antioxidant and it prevent them from being oxidised.

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Answer:
Corrosion: It is the process in which metals are slowly eaten up by the action of air moisture or chemicals. For example rusting is a form of corrosion in which iron is eaten up by the action of air and moisture and a reddish brown coating of iron oxide is formed as shown in the following chemical reaction.

class 10 Chemical Reactions And Equations Science ncert solutions

Rancidity: When the substance containing oils and fats are exposed to air they get oxidised and become rancid due to which their smell, taste and colour change. This process is known as rancidity. For example when a when butter is kept open for a long time then its smell and taste gets changed.

Concept Chapter 1 Class 10 Science Chemical Reactions And Equations Ncert Solutions

Concepts: Chemical Reactions and equations

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Chemical Equations: It is the symbolic representation of a chemical reaction where the reactant entities are given on the left hand side and the product entities on the right hand side of the equation. In complete chemical equation all reactants and products are written along with their physical state. A chemical equation must be balanced so that it can follow the law of conservation of mass. For example

class 10 Chemical Reactions And Equations Science ncert solutions

Balanced Chemical equation:If in a chemical equation the total number of atoms in the reactant side are equal to the total number of atoms in the product side then the chemical reaction is said to be balanced.

class 10 Chemical Reactions And Equations Science ncert solutions

Combination Reaction:If in a Chemical equation, two or more reactants combine to form a single product then it is known as combination reaction.

class 10 Chemical Reactions And Equations Science ncert solutions

Decomposition reaction:If in a chemical reaction a single substance decomposes to form two or more substances then it is known as decomposition reaction.

class 10 Chemical Reactions And Equations Science ncert solutions

Displacement Reaction:If in a chemical equation, more reactive elements displaces a less reactive element from its compound then it is known as displacement reaction.

class 10 Chemical Reactions And Equations Science ncert solutions

Double displacement reaction:If in a chemical reaction exchange of ions takes place then it is known as double displacement reaction

class 10 Chemical Reactions And Equations Science ncert solutions

Precipitation Reaction:A white coloured substance which is insoluble in water also known as precipitate is formed during a chemical reaction then the reaction is known as precipitation reaction

class 10 Chemical Reactions And Equations Science ncert solutions

In this reaction Barium sulphate is a white colour precipitate.

Oxidation Reaction:It is a chemical reaction in which gain of oxygen or loss of hydrogen takes place. For example in the following reaction copper is oxidised to become copper oxide.

class 10 Chemical Reactions And Equations Science ncert solutions

Reduction Reaction:It is a chemical reaction in which loss of oxygen or gain of hydrogen takes place. For example in the following reaction copper oxide is reduced to become copper.

class 10 Chemical Reactions And Equations Science ncert solutions

Redox Reaction or Oxidation-Reduction reaction:The chemical reaction in which both oxidation and reduction takes place is known as Redox reaction. For example in the following reaction Hydrogen is oxidised to become water and copper oxide is reduced to become copper.

class 10 Chemical Reactions And Equations Science ncert solutions

Corrosion:It is the process in which metals are slowly eaten up by the action of air moisture or chemicals. For example rusting is a form of corrosion in which iron is eaten up by the action of air and moisture and a reddish brown coating of iron oxide is formed as shown in the following chemical reaction.

class 10 Chemical Reactions And Equations Science ncert solutions

Rancidity:When the substance containing oils and fats are exposed to air they get oxidised and become rancid due to which their smell, taste and colour change. This process is known as rancidity. For example when a when butter is kept open for a long time then its smell and taste gets changed.

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