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Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 3 - Chemical reactions and equations [Latest edition]

Chapters

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Chapter 3: Chemical reactions and equations

Exercises
Exercises [Pages 45 - 46]

Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board Chapter 3 Chemical reactions and equations Exercises [Pages 45 - 46]

Exercises | Q 1.1 | Page 45

Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.

Exercises | Q 1.2 | Page 45

Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

The conversion of ferrous sulphate to ferric sulphate is ______ reaction. 

Exercises | Q 1.3 | Page 45

Choose the correct option from the given options and explain the statement giving the reason.

When an electric current is passed through acidulated _________ of water takes place. 

  • Oxidation

  • Displacement

  • Electrolysis

  • Reduction

  • zinc

  • copper

  • Double displacement

  • Decomposition

Exercises | Q 1.4 | Page 45

Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition) 

Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.

Write answer to the following.

Exercises | Q 2.1 | Page 45

What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.

Exercises | Q 2.2 | Page 45

Write answer to the following.

How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?

Exercises | Q 2.3 | Page 45

Write answer to the following.

Explain the term reactant and product giving examples.

Exercises | Q 2.4 | Page 45

Write answer to the following.

Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.

Exercises | Q 2.5 | Page 45

Write the answer to the following.

Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water.

Exercises | Q 3.1 | Page 45

Explain the terms with examples.

Endothermic reaction

Exercises | Q 3.2 | Page 45

Explain the  terms with examples.

 Combination reaction

Exercises | Q 3.3 | Page 45

Explain the terms with examples.

Balanced equation

Exercises | Q 3.4 | Page 45

Explain the terms with examples.

Displacement reaction

Exercises | Q 4.1 | Page 45

Give scientific reason.

When the gas formed on heating limstone is passed through freshly prepared lime water, the lime water turns milky.

Exercises | Q 4.2 | Page 45

Give scientific reason.

It takes time for pieces of Shahabad tile to disappear in HCl, but its powder disappears rapidly.

Exercises | Q 4.3 | Page 45

Give scientific reason.

While preparing dilute sulphuric acid from concentrated sulphuric acid in the laboratory, the concentrated sulphuric acid is added slowly to water with constant stirring.

Exercises | Q 4.4 | Page 45

Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.

Exercises | Q 5 | Page 45

Observe the following picture a write down the chemical reaction with the explanation.

Exercises | Q 6.1 | Page 46

Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS

Exercises | Q 6.2 | Page 46

Identify from the following reaction the reactants that undergo oxidation and reduction.

2Ag2O → 4 Ag + O2 ↑

Exercises | Q 6.3 | Page 46

Identify from the reaction the reactants that undergo oxidation and reduction.

2Mg + O2 → 2MgO

Exercises | Q 6.4 | Page 46

Identify from the reaction the reactants that undergo oxidation and reduction.

\[\ce{NiO + H2 -> Ni + H2O}\]

Exercises | Q 7.1 | Page 46

Balance the equation stepwise.
H2S2O7(l) + H2O(l) → H2SO4(l)

Exercises | Q 7.2 | Page 46

Balance the equation stepwise.

 SO2(g) + H2S(aq) → S(s) + H2O(l) 

Exercises | Q 7.3 | Page 46

Balance the equation stepwise.

 Ag(s) + HCl(aq) → AgCl ↓+ H2 ↑ 

Exercises | Q 7.4 | Page 46

Balance the equation stepwise.

NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + H2O(l)

Exercises | Q 8.1 | Page 46

Identify the endothermic and exothermic reaction.

 HCl + NaOH → NaCl + H2O + heat 

  • Exothermic reaction

  • Endothermic reaction

Exercises | Q 8.2 | Page 46

Identify the endothermic and exothermic reaction.

\[\ce{2KClO_{3(s)}->[\Delta] 2KCl_{(s)} + 3O2}\]

  • Exothermic reaction

  • Endothermic reaction

Exercises | Q 8.3 | Page 46

Identify the endothermic and exothermic reaction.

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\]

  • Exothermic reaction

  • Endothermic reaction

Exercises | Q 8.4 | Page 46

Identify the endothermic and exothermic reaction.

\[\ce{CaCO_{3(s)}->[\Delta] CaO_{(s)} + CO2}\]

  • Exothermic reaction

  • Endothermic reaction

Exercises | Q 9 | Page 46
Reactants Products Type of chemical reaction
BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement
2AgCl(s) FeSO4(aq) + Cu(s) Combination
CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition
H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement
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Chapter 3: Chemical reactions and equations

Exercises

Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 3 - Chemical reactions and equations

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Concepts covered in Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 3 Chemical reactions and equations are Classification of Change: Chemical Changes, Chemical Equation, Types of Chemical Change or Chemical Reaction, Direct Combination (or Synthesis) Reaction, Decomposition Reactions, Single Displacement Reactions, Double Displacement Reaction, Energy Change in Chemical Reactions, Rate of Chemical Reaction, Oxidation, Reduction and Redox Reactions, Corrosion of Metals and Its Prevention, Rancidity of Food and Its Prevention, Chemical Reaction, Balancing Chemical Equation, Factors Affecting the Rate of a Chemical Reaction.

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