Basic questions for science class 10th (ncert)

NCERT Solutions for Class 10 Science Chapter 1: Excellent study materials are required for
students studying in Class 10 CBSE Chemistry Chapter 1 Chemical Reactions and Equations,
according to NCERT Solutions for Class 10 Science. Subject matter specialists have created
these NCERT Solutions in accordance with the most recent CBSE Syllabus.

It is crucial that students use NCERT Solutions to assist them learn how to solve and study so
they can become familiar with the kinds of questions that are posed in the chapter as well as
chemical reactions and equations.


NCERT Solutions for Class 10 Science Chapter 1
Overview
NCERT Solutions for Class 10 Science Chapter 1 "Chemical Reactions and Equations,"
introduces students to the fundamental concepts of chemical reactions and how they are
represented using chemical equations. The chapter explains the types of chemical reactions,
such as combination, decomposition, displacement, and double displacement reactions. It also
covers the concepts of oxidation and reduction (redox reactions).

NCERT Solutions for Class 10 Science Chapter 1 emphasizes the importance of balancing
chemical equations to adhere to the law of conservation of mass. Students learn to write and
balance equations for various reactions, including precipitation reactions and exothermic and
endothermic reactions.




NCERT Solutions for Class 10 Science Chapter 1
Chemical Reactions and Equations
Here we have provided NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions
and Equations -

In-text questions set 1 Page number – 6

1. Why should a magnesium ribbon be cleaned before burning in the air?

Solution:

Because magnesium metal combines with ambient oxygen to generate magnesium oxide
(MgO) layer, a very stable chemical, magnesium ribbon should be cleaned before burning in the
air. Hence, the ribbon must be cleaned by removing the coating of MgO in order to stop more
reactions with oxygen.

, 2. Write a balanced equation 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

Solution:

i) H2 + Cl2 → 2HCl

ii) 3BaCl2 + Al2(SO4)3 →3BaSO4 + 2AlCl3

iii) 2Na + 2H2O → 2NaOH + H2

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 the hydrochloric acid solution to
produce Sodium chloride solution and water.

Solution:

i) BaCl2 + Na2SO4 → BaSO4 + 2NaCl

ii) NaOH + HCl → NaCl + H2O

In-text questions set 2 Page number – 10

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.

Solution:

i) The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide and its
formula is CaO.

ii) CaO + H2O → Ca(OH)2

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