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# Balbharati solutions for Class 10th Board Exam Science and Technology - 1 chapter 3 - Chemical reactions and equations

## Chapter 3 : Chemical reactions and equations

#### Pages 45 - 46

Q 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)
a. To prevent rusting, a layer of ........ metal is applied on iron sheets.
b. The conversion of ferrous sulphate to ferric sulphate is ........ reaction.
c. When electric current is passed through acidulated water ........ of water takes place.
d. Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ....... reaction.

Q 2 | Page 45

a. What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
b. How can the rate of the chemical reaction, namely, decomposition of hydrogen peroxide be increased?
c. Explain the term reactant and product giving examples.
d. Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
e. Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water.

Q 3.1 | Page 45

Explain the terms with examples.

Endothermic reaction

Q 3.2 | Page 45

Explain the  terms with examples.

Combination reaction

Q 3.3 | Page 45

Explain the terms with examples.

Balanced equation

Q 3.4 | Page 45

Explain the terms with examples.

Displacement reactiona

Q 4.1 | Page 45

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

Q 4.2 | Page 45

Give scientific reasons.

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

Q 4.3 | Page 45

Give scientific reasons.

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

Q 4.4 | Page 45

Give scientific reasons.

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

Q 5 | Page 45

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

Q 6.1 | Page 46

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

Q 6.2 | Page 46

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

b. 2Ag2O → 4 Ag + O2 ↑

Q 6.3 | Page 46

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

c. 2Mg + O2 → 2MgOa

Q 6.4 | Page 46

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

d. NiO + H2 → Ni + H2O

Q 7.1 | Page 46

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

Q 7.2 | Page 46

Balance the equation stepwise.

b. SO2(g) + H2S(aq) → S(s) + H2O(l)

Q 7.3 | Page 46

Balance the equation stepwise.

Ag(s) + HCl(aq) → AgCl ↓+ H2 ↑

Q 7.4 | Page 46

Balance the equation stepwise.

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

Q 8.1 | Page 46

Identify the endothermic and exothermic reaction.

a. HCl + NaOH → NaCl + H2O + heat

Q 8.2 | Page 46

Identify the endothermic and exothermic reaction.

b. $2 {KClO}_3 \left( s \right) \to^∆ 2KCl\left( s \right) + 3 O_2 \uparrow$

Q 8.3 | Page 46

Identify the endothermic and exothermic reaction.

c. CaO + H2O → Ca(OH)2 + heat

Q 8.4 | Page 46

Identify the endothermic and exothermic reaction.

d. $Ca {CO}_3 \left( s \right) \to^∆ CaO\left( s \right) + {CO}_2 \uparrow$

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

## Balbharati solutions for Class 10th Board Exam Science and Technology - 1 chapter 3 - Chemical reactions and equations

Balbharati solutions for Class 10th Board Exam Science and Technology - 1 chapter 3 (Chemical reactions and equations) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board SCC Class 10 Science and Technology part 1 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 10th Board Exam Science and Technology - 1 chapter 3 Chemical reactions and equations are Rancidity, Corrosion of Iron (Rusting), Types of Chemical Reactions - Oxidation and Reduction, Factors Affecting the Rate of a Chemical Reaction, Rate of Chemical Reaction, Endothermic and Exothermic Reactions, Endothermic and Exothermic Processes, Types of Reactions - Double Displacement, Types of Reactions - Displacement, Types of Reactions - Decomposition, Types of Reactions - Combination, Types of Chemical Reactions, Steps in Balancing a Chemical Reaction, Balancing a Chemical Equation, Writing a Chemical Equation, Chemical equations, Chemical Reactions.

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