# NCERT Solutions For Class 10 Science chapter 1 Chemical Reactions and Equations

### NCERT Books Solutions For Class 10 Science chapter 1 Chemical Reactions and Equations

NCERT Solutions For Class 10 Science chapter 1 Chemical Reactions and Equations is the first stepping stone for a student in the competitive world. With the introduction of the CBSE Board Exam for class 10 a few years back, this has become an important gateway for a student as based on the results of class 10th a student selects his future stream of Science, Commerce, or Arts.

Takshila Learning provides you with detailed and well explained NCERT Solutions for Class 10 of each chapter of each subject for NCERT Class 10. These NCERT Solutions help you to easily understand every concept so that you can score high in your CBSE Class 10 Board Exams.

Below you can find the NCERT solution for Class 10 Science. You can get a Solution for the all-important question of “Class 10 Science CH 1 Chemical Reactions and Equations”

## In brief

Ques 1: Why should a magnesium ribbon be cleaned before burning in
air?

Ques 2: Write balanced equations for the following chemical reactions.
i) Hydrogen + Chloride → Hydrogen chloride
ii) Barium chloride + Aluminium Sulphate → Barium sulphate +
Aluminium chloride
iii) Sodium + Water → Sodium hydroxide + Hydrogen

Ques 3: Write a balanced chemical equation with state symbols for the
following reactions
i) Solutions of Barium chloride and Sodium Sulphate in water react to
give insoluble Barium Sulphate and solution of Sodium chloride.
ii) Sodium hydroxide solution in water reacts with hydrochloric acid
solution to produce Sodium chloride solution and water.

## Pg. No. 10

Ques 1: A solution of a substance ‘X’ is used for whitewashing. (i) Name
the substance ‘X’ and write its formula. (ii) Write the reaction of the
substance ‘X’ named in (i) above with water.

Ques 2: Why is the amount of gas collected in one of the test tubes in
Activity 1.7 double of the amount collected in the other? Name this gas

## Pg. No. 13

Ques 1: Why does the colour of copper sulphate solution change when an
iron nail is dipped in it?

Ques 2: Give an example of a double displacement reaction other than
the one was given in Activity 1.10.

Ques 3: Identify the substances that are oxidized and that are reduced in
the following equation.
i) 4Na(s)+O2(g) → 2Na2O(s)
ii) CuO(s)+H2(g) → Cu(s)+H2O(l)

## EXERCISE

Ques 1: Which of the statements about the reaction below are incorrect?
2PbO(s) +C(s) →2Pb(s)+CO2(g)
(b) Carbon Dioxide is getting oxidised
(c) Carbon is getting oxidised
(d) Lead oxide is getting reduced
(i) (a) and (b)
(ii) (a) and (c)
(iii) (a), (b) and (c)
(iv) all

Ques 2: Fe2O3+2Al→Al2O3+2Fe
The above reaction is an example of a
1. Combination reaction.
2. Double displacement reaction.
3. Decomposition reaction.
4. Displacement reaction.

Ques 3: What happens when dilute hydrochloric acid is added to iron
1. Hydrogen gas and Iron chloride are produced.
2. Chlorine gas and Iron hydroxide are produced.
3. No reaction takes place.
4. Iron salt and water are produced.

Ques 4: TWhat is a balanced chemical equation? Why should a chemical
equation be balanced?

Ques 5: Translate the following statements into chemical equations and
balance them.
(a) Hydrogen gas combines with nitrogen to form ammonia.
(b) Hydrogen Sulphide gas burns in air to give water and sulphur
dioxide.
(c) Barium chloride reacts with aluminium sulphate to give Aluminium
chloride and a precipitate of barium sulphate.
(d) Potassium metal reacts with water to give potassium hydroxide and
Hydrogen gas.

Ques 6: Balance the following chemical equations.
(a) HNO3 +Ca(OH)2 → Ca(NO3)2 + H2O
(b) NaOH + H2SO4 → Na2SO4 + H2O
(c) NaCl + AgNO3 → AgCl + NaNO3
(d) BaCl2 + H2SO4 → BaSO4 + HCl

Ques 7: Write the balanced chemical equation for the following
reactions.
I. Calcium hydroxide + Carbon dioxide —-> Calcium carbonate +
Water
II. Zinc + Silver nitrate —-> Zinc nitrate + Silver
III. Aluminium + Copper chloride —-> Aluminium chloride + Copper
IV. Barium chloride + Potassium sulphate —-> Barium sulphate +
Potassium chloride

Ques 8: Write a balanced chemical equation for the following and
identify the type of reaction of each case
I. KBr+BaI2→KI+BaBr2
II. ZnCO3→ZnO+CO2
III. H2+Cl→HCl
IV. Mg+HCl→MgCl2+H2

Ques 9: What is meant by exothermic and endothermic reactions? Give
examples.

Ques 10: Why is respiration considered to be an exothermic reaction?

Ques 11: Why are decomposition reactions called the opposite of
Combination reactions? Write equations for decomposition reactions.

Ques 12: Write one equation each for decomposition reactions in which
energy is supplied in the form of heat, light or electricity.

Ques 13: What is the difference between displacement and double
displacement reactions? Write relevant equations for the above.

Ques 14: In the refining of Silver, the recovery of silver from Silver
nitrate solution involves displacement reaction by Copper metal. Write
down the reaction involved.

Ques 15: What do you mean by a precipitation reaction? Explain by
giving examples.

Ques 16: Explain the following in terms of gain of oxygen with two
examples each.
(a) Oxidation
(b) Reduction

Ques 17: A shiny brown coloured element ‘X’ on heating in the air
becomes black in colour. Name the element ‘X’ and the black coloured
compound formed.

Ques 18: Why do we apply paint on iron articles?

Ques 19: Oil and Fat containing food items are flushed with Nitrogen.
Why?

Ques 20: : Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity

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### NCERT Solutions for Class 10 Science Chapter 1 Question Answer

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Important tags : NCERT Solutions For Class 10 Science Chapter 1 / NCERT Science Book Class 10 Chapter 1 / Ch 1 Science Class 10 / Class 10 Science Chapter 1 Question Answer / Chemical Reactions And Equations / Chemical Reaction And Equation Class 10 / Class 10 Science Ch 1

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