Chemical Reaction And Equation Class 10 Notes

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Chemical Reaction And Equation Class 10 Notes

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NCERT Class 10 Chemistry notes PDF in English medium neatly typed chapter wise for academic and IIT JEE Exams are available for free Download. These notes will make you understand the small to smallest finest basic concept of chemistry and complete the syllabus on the time. Free downloading them from this site.

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Chemical Reaction and Equation Notes

Contents of Notes

  • Balancing
  • Combination
  • Decomposition
  • Oxidation
  • Reduction

Metal and Non-Metal

Contents of PDF

  • Metalic reaction with oxygen
  • Reaction with water
  • Reaction with hydrogen
  • Reaction with non-metal
  • Gangue
  • Alloy

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Carbon and its Compound

  • Covalent bond in carbon
  • Concatenation
  • Tetravalence
  • Saturated and unsaturated carbon compound
  • Structural isomer

Acid, Bases and Salt

  • Reaction with metal
  • Action of acid with metal carbonate and metal bicarbonate
  • Neutralizing reaction
  • Reaction of metal oxide with acids
  • Reaction of non-metal oxide with base
  • PH
  • Acidic salts
  • Washing soda

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Periodic Element

  • Atomic mass
  • Newlands law of octave
  • Modern Periodic table
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Important Questions of Chemical Reactions and Equations Class 10 Science Chapter 1

Question 1.
Identify ‘x’, ‘y’ and ‘z’ in the following reaction :
Chemical Reactions and Equations Class 10 Important Questions with Answers Science Chapter 1 Img 1
(a) x = gas; y = reaction condition; z = gas
(b) x = solid; y = liquid; z = gas
(c) x = number of moles of KClO3; y = reaction condition; z = number of molecules of oxygen
(d) x = physical state of KClO3 and KCl;
y = reaction condition, z = physical state of O2. (2020)
Answer:
Chemical Reactions and Equations Class 10 Important Questions with Answers Science Chapter 1 Img 2

Question 2.
Assertion (A) : Following is a balanced chemical equation for the action of steam on iron : 3Fe + 4H2O → Fe3O4 + 4H2
Reason (R): The law of conservation of mass holds good for a chemical equation.
(a) Both (A) and (R) are true and reason (R) is the correct explanation of the assertion (A)
(b) Both (A) and (R) are true, but reason (R) is not the correct explanation of the assertion (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true. (2020)
Answer:
A balanced chemical equation must obey the law of conservation of mass.

Question 3.
(a) State the law that is followed by balancing a chemical equation.
(b) Balance the following chemical equation: Na + H3O → NaOH + H2 (Board Term I, 2013)
Answer:
(a) Law of conservation of mass is followed for balancing a chemical equation which states that mass can neither be created nor destroyed in a chemical reaction. That is, the total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants in a balanced equation.

(b) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Question 4.
Explain the significance of photosynthesis.
Write the balanced chemical equation involved in the process. (Board Term I, 2017)
Answer:
Photosynthesis means synthesis with the help of light. It is the process that gives life to all living beings.
Photosynthesis is a process by which plants utilize carbon dioxide and water in the presence of sunlight to produce glucose and oxygen.
Chemical Reactions and Equations Class 10 Important Questions with Answers Science Chapter 1 Img 3

Question 5.
Write balanced chemical equations for the following chemical reactions:
(a) Hydrogen + Chlorine → Hydrogen chloride
(b) Lead + Copper chloride → Lead chloride + Copper
(c) Zinc oxide + Carbon → Zinc + Carbon monoxide (Board Term I, 2014)
Answer:
(a) H2(g) + Cl2(g) → 2HCl(g)
(b) Pb(s) + CuCl2(aq) → PbCl2(aq)+ Cu(s)
(c) ZnO(s) + C(s) → Zn(s) + CO(g)

Question 6.
Calcium oxide reacts vigorously with water to produce slaked lime.
CaO(s) + H2O(l) → Ca(OH)2(aq)
This reaction can be classified as
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Oxidation reaction
Which of the following is a correct option? (2020)
(a) (A) and (C)
(b) (C) and (D)
(c) (A), (C) and (D)
(d) (A) and (B)
Answer:
(d) The reaction between CaO and H2O to form Ca(OH)2 is an exothermic combination reaction.

Question 7.
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 a (2020)
(a) combination reaction
(b) displacement reaction
(c) decomposition reaction
(d) double displacement reaction.
Answer:
(d) CuSO4 + H2S → CuS + H2SO4
It is a double displacement reaction as in this reaction CuSO4 and H2S reacting by exchange of Cu2+ and H+ ions to from two new compounds i.e., CuS and H2SO4.

Question 8.
In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution :
(A) exchange of atoms takes place
(B) exchange of ions takes place
(C) a precipitate is produced
(D) an insoluble salt is produced
The correct option is (2020)
(a) (B) and (D)
(b) (A) and (C)
(c) only (B)
(d) (B), (C) and (D)
Answer:
(d) In this reaction exchange of Na+ and Ba2+ ions takes place forming BaSO4 which is a white precipitate i.e., an insoluble salt.
Na2SO4 + BaCl2 → BaSO4 ↓+ 2NaCl

Question 9.
In which of the following, the identity of initial substance remains unchanged? (2020)
(a) Curdling of milk
(b) Formation of crystals by process of crystallisation
(c) Fermentation of grapes
(d) Digestion of food
Answer:
(b): Formation of crystals is a physical change rest others are chemical change.

Question 10.
Study the following equation of a chemical reaction: (Board Term 1, 2015)
H2 + Cl2 → 2HCl
(i) Identify the type of reaction.
(ii) Write a balanced chemical equation of another example of this type of reaction.
Answer:
(i) Combination reaction.
(ii) Another example of combination reaction is
Chemical Reactions and Equations Class 10 Important Questions with Answers Science Chapter 1 Img 4

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