NCERT Class 12 Chemistry Part 1 The Solid State

Objectives:   After studying this Unit, you will be able to • Describe general characteristics of solid state; • Distinguish between amorphous and crystalline solids; • Classify crystalline solids on the basis of the nature of binding forces; • Define crystal lattice and unit…

NCERT Solutions Class 11 Chemistry Chapter 6 Thermodynamics

Question. Choose the correct answer. A thermodynamic state function is a quantity (i) used to determine heat changes  (ii) whose value is independent of path  (iii) used to determine pressure volume work  (iv) whose value depends on temperature only Answer :…

NCERT Solutions Class 11 Chemistry Chapter 10 The s Block Elements

1. What are the common physical and chemical features of alkali metals? Answer: Physical properties: (1) The alkali metal is  soft and so we can cut them easily. We can able to cut the sodium metal even by using the knife. (2) Generally the alkali metal is lightly…

NCERT Solutions Class 11 Chemistry Chapter 5 States of Matter

Question. What will be the minimum pressure required to compress 500 dm3 of air at 1 bar to 200 dm3 at 30°C? Answer : Given, Initial pressure, P1 = 1 bar Initial volume, V1 = 500  dm3 Final volume, V2 = 200 dm3 Since the temperature remains…

NCERT Solutions Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry

Question. Calculate the molecular mass of the following : (i) H2O (ii) CO2 (iii) CH4 Answer : (i)CH4 : Molecular weight of methane, CH4 = (1 x Atomic weight of carbon) + (4 x Atomic weight of hydrogen) = [1(12.011 u) +4 (1.008u)] = 12.011u + 4.032 u = 16.043 u (ii) H2O :…

NCERT Solutions Class 11 Chemistry Chapter 8 Redox Reactions

Question. Assign oxidation number to the underlined elements in each of the following species: (a) NaH2 P O4 (b) NaH SO4 (c) H4 P2O7 (d) K2MnO4 (e) CaO2 (f) NaBH4 (g) H2S2O7 (h) KAl(SO4)2 ⋅ 12H2O Answer : (a) Let the oxidation number of P be x. We…

NCERT Solutions Class 11 Chemistry Chapter 12 Organic Chemistry

Question 12.1: What are hybridisation states of each carbon atom in the following compounds? CH2 = C = O, CH3 CH = CH2, (CH3)2CO, CH2 = CHCN, C6H6 Answer: C–1 is sp2 hybridised. C–2 is sp2 hybridised. C–3 is sp hybridised. (v) C6H6 All the 6…

NCERT Solutions Class 11 Chemistry Chapter 9 Hydrogen

  Question. Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes? Answer : Hydrogen has three isotopes. They are: The mass ratio of protium, deuterium and tritium is 1:2:3. Question. Why does hydrogen occur in a diatomic form…

NCERT Solutions Class 11 Chemistry Chapter 13 Hydrocarbons

Question. How do you account for the formation of ethane during chlorination of methane? Answer : Chlorination of methane proceeds via a free radical chain mechanism. The whole reaction takes place in the given three steps. Step 1: Initiation: The reaction begins with the…

NCERT Solutions Class 11 Chemistry Chapter 7 Equilibrium

  NCERT Class 11 Solutions Equilibrium - NCERT Solutions prepared for CBSE students by the best teachers in Delhi. Class XI Chapter 7 – Equilibrium Chemistry Question 7.1: A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The…

NCERT Solutions Class 11 Chemistry Chapter 14 Environmental Chemistry

Question. Define environmental chemistry. Answer: Environmental chemistry is the study of chemical and biochemical processes occurring in nature. It deals with the study of origin, transport, reaction, effects, and fates of various chemical species in the environment.…

NCERT Solutions Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties

Question. What is the basic theme of organization in the periodic table? Answer : It is to characterize the elements in periods and groups as per their properties. So, this course of action makes the investigation of elements and compounds of elements in a simple one and…

NCERT Solutions Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure

  NCERT Class 11 Solutions Chemical Bonding and Molecular Structure - NCERT Solutions prepared for CBSE students by the best teachers in Delhi. Class XI Chapter 4 – Chemical Bonding and Molecular Structure Chemistry Question 4.1: Explain the formation of a…

NCERT Class 11 Chemistry The s Block Elements

THE s -BLOCK ELEMENTS The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. As the s-orbital can accommodate only two electrons, two groups (1 & 2) belong to the s-block of the Periodic Table.Group 1 of the Periodic…