NCERT SOLUTIONS FOR CLASS 11 CHEMISTRY
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Last modified:2019-08-22
NCERT Solutions for Class 11 Chemistry and Read NCERT Class 11 Chemistry Notes
FreshersLive acts as a great provider of NCERT Solutions for Class 11 Chemistry. Students who are looking for Class 11 Chemistry notes can get it here. NCERT Solutions for Class 11 Chemistry for all chapters is provided here for student's reference. Download the complete solution for Class 11 Chemistry Question and Answers for free. Besides, students can acquire the NCERT Solutions for Class 11 Chemistry in the PDF format soon. CBSE students of Class 11 can use the solutions given here for all chapters to prepare for the exams. Prepare for your exam by referring the NCERT Solutions for Class 11 Chemistry to score good marks.
NCERT Class 11 Chemistry Chapter Wise Solutions
Chapter 1 – Some Basic Concepts of Chemistry
Chapter 2 – Structure of Atom
Chapter 3 – Classification of Elements and Periodicity in Properties
Chapter 4 – Chemical Bonding and Molecular Structure
Chapter 5 – States of Matter
Chapter 6 – Thermodynamics
Chapter 7 – Equilibrium
Chapter 8 – Redox Reactions
Chapter 9 – Hydrogen
Chapter 10 – The s-Block Elements
Chapter 11 – The p-Block Elements
Chapter 12 – Organic Chemistry – Some Basic Principles and Techniques
Chapter 13 – Hydrocarbons
Chapter 14 – Environmental Chemistry
Chapter 1 - SOME BASIC CONCEPTS OF CHEMISTRY
1. Calculate the molecular mass of the following:
(i) 
(ii) 
(iii) 
Answer:
(i) :
The molecular mass of water,
- (2
Atomic mass of hydrogen) + (1 Atomic mass of oxygen) - [2(1.0084) + 1(16.00 u)]
- 2.016 u + 16.00 u
- 18.016
- 18.02 u
(ii)
:
The molecular mass of carbon dioxide,
- (1 Atomic mass of carbon) + (2 Atomic mass of oxygen)
- [1(12.011 u) + 2 (16.00 u)]
- 12.011 u + 32.00 u
- 44.01 u
(iii) 
:
The molecular mass of methane,
- (1 Atomic mass of carbon) + (4 Atomic mass of hydrogen)
- [1(12.011 u) + 4 (1.008 u)]
- 12.011 u + 4.032 u
- 16.043 u
2. Calculate the mass percent of different elements present in sodium sulphate ( 
).
Answer:
The molecular formula of sodium sulphate is
.
Molar mass of = [(2 × 23.0) + (32.066) + 4 (16.00)] = 142.066 g
Mass percent of an element
- Mass percent of sodium:
Mass percent of sulphur:
Mass percent of oxygen:
3. Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass.
Answer:
% of iron by mass = 69.9 % [Given]
- of oxygen by mass = 30.1 % [Given] Relative moles of iron in iron oxide:
Relative moles of oxygen in iron oxide:
Simplest molar ratio of iron to oxygen:
- 1.25: 1.88
- 1: 1.5
=2: 3
- The empirical formula of the iron oxide is
.
4. Calculate the amount of carbon dioxide that could be produced when
(i) 1 mole of carbon is burnt in air.
(ii) a mole of carbon is burnt in 16 g of dioxygen.
(iii) 2 moles of carbon is burnt in 16 g of dioxygen.
Answer:
The balanced reaction of combustion of carbon can be written as:
i. As per the balanced equation, 1 mole of carbon burns in1 mole of dioxygen (air) to produce1 mole of carbon dioxide.
ii. According to the question, only 16 g of dioxygen is available. Hence, it will react with 0.5 mole of carbon to give 22 g of carbon dioxide. Hence, it is a limiting reactant.
iii. According to the question, only 16 g of dioxygen is available. It is a limiting reactant. Thus, 16 g of dioxygen can combine with only 0.5 mole of carbon to give 22 g of carbon dioxide.
5. Calculate the mass of sodium acetate 
required to make 500 mL of
0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g 
Answer:
0.375 M aqueous solution of sodium acetate
1000 mL of a solution containing 0.375 moles of sodium acetate
∴Number of moles of sodium acetate in 500 mL
Given
Molar mass of sodium acetate = 82.0245 g 
Required mass of sodium acetate = (82.0245 g 
) * (0.1875 mole) = 15.38 g
6. Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g 
and the mass per cent of nitric acid in it being 69%.
Answer: Mass percent of nitric acid in the sample = 69 % [Given]
Thus, 100 g of nitric acid contains 69 g of nitric acid by mass.
Molar mass of nitric acid (HNO3 )
- {1 + 14 + 3(16)} g
- 1 + 14 + 48
- 63 g
- Number of moles in 69 g of HNO3
Volume of 100g of nitric acid solution
Concentration of nitric acid
∴Concentration of nitric acid = 15.44 mol/L
7. How much copper can be obtained from 100 g of copper sulphate (
)? Ans. 1 mole of CuSO4 contains 1 mole of copper.
Molar mass of CuSO4 = (63.5) + (32.00) + 4(16.00)
- 63.5 + 32.00 + 64.00
- 159.5 g
159.5 g of CuSO4 contains 63.5 g of copper.
⇒ 100 g of CuSO4 will contain
of copper.
Amount of copper that can be obtained from 100 g CuSO4
= 39.81 g
8. Determine the molecular formula of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide
is 159.69 g 
.
Answer:
Mass percent of iron (Fe) = 69.9% (Given)
Mass percent of oxygen (O) = 30.1% (Given)
Number of moles of iron present in the oxide
= 1.25
Number of moles of oxygen present in the oxide
= 1.88
Ratio of iron to oxygen in the oxide,
1: 1.5
2: 3
The empirical formula of the oxide is .
Empirical formula mass of = [2(55.85) + 3(16.00)] g
Molar mass of = 159.69 g
Molecular formula of a compound is obtained by multiplying the empirical formula with n.
Thus, the empirical formula of the given oxide is and n is 1.
Hence, the molecular formula of the oxide is .
9. Calculate the atomic mass (average) of chlorine using the following data:
Answer:
The average atomic mass of chlorine
- 26.4959 + 8.9568
- 35.4527 u
The average atomic mass of chlorine = 35.4527 u
10. In three moles of ethane 
calculate the following:
i. Number of moles of carbon atoms.
ii. Number of moles of hydrogen atoms.
iii. Number of molecules of ethane.
Answer:
(i) 1 mole of 
contains 2 moles of carbon atoms.
Number of moles of carbon atoms in 3 moles of
= 2 × 3 = 6
ii. 1 mole of 
contains 6 moles of hydrogen atoms. Number of moles of carbon atoms in 3 moles of = 3 × 6 = 18
1 mole of 
contains 
molecules of ethane. Number of molecules in 3 moles of 
= 3 × 6.023 × 1023 = 
11. What is the concentration of sugar (
) in mol
if its 20 g are dissolved in enough water to make a final volume up to 2 L?
Answer:
Molarity (M) of a solution is given by,
Molar concentration of sugar = 0.02925 
12. If the density of methanol is 0.793 kg
, what is its volume needed for making 2.5 L of its 0.25 M solution?
Answer:
Molar mass of methanol (
) = (1 × 12) + (4 × 1) + (1 × 16)
- 32 g
- 0.032 kg
Molarity of methanol solution
= 24.78
(Since density is mass per unit volume)
Applying,
(Given solution) (Solution to be prepared)
(24.78 ) 
= (2.5 L) (0.25 )
-
- 0.0252 L
-
- 25.22 mL
13. Pressure is determined as force per unit area of the surface. The SI unit of pressure,
Pascal is as shown below: 1Pa = 
If mass of air at sea level is 1034 g
, calculate the pressure in Pascal.
Answer:
Pressure is defined as force acting per unit area of the surface.
= 1.01332 × 105 kg 
We know, 1 N = 1 kg
Then,
1 Pa = 1 
= 1 kg 
1 Pa = 1 kg 
Pressure = 1.01332 x 105 Pa
14. What is the SI unit of mass? How is it defined?
Answer. The SI unit of mass is kilogram (kg). 1 Kilogram is defined as the mass equal to the mass of the international prototype of kilogram.
15. Match the following prefixes with their multiples:
Answer:
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