Class 11 Chemistry NCERT Solutions Chapter 14: Environmental Chemistry Question 1. Define environmental chemistry. Answer: Environmental chemistry is the branch of science which deals with the chemical changes in the environment. It includes our surroundings such as air, water, soil, forests, sunlight etc. Question 2. Explain tropospheric pollution in 100 words. Answer: Tropospheric Pollution Tropospheric […]
Class 11 Chemistry NCERT Solutions Chapter 13: Hydrocarbons Question 1. How will you account for the formation of ethane during chlorination of methane ? Answer: The chlorination of methane proceeds by free radical mechanism. The methyl free radicals (CH3) are converted to ethane during chain termination step. H3C˙ + C˙H3 → CH3—CH3 Chlorination. In the chlorination of
Class 11 Chemistry NCERT Solutions Chapter 12: Organic Chemistry : Some Basic Principles and Techniques Question 1. What are the hybridised states of carbon atoms in the following compounds ? (1) CH2=C=O (2) CH3CH=CH2 (3) (CH3)2 C=O (4) CH=CH2 CN (5) C6H6 Answer: Question 2. Indicate sigma (σ) and pi (Π) bonds in the following molecules : (1)
Class 11 Chemistry NCERT Solutions Chapter 11: The p-Block Elements Question 1. Discuss the pattern of variation in oxidation states of : (1) B to Tl (2) C to Pb. Answer: (1) B to Tl. The common oxidation states are +1 and +3. The stability of + 3 oxidation state decreases from B to Tl. +
Class 11 Chemistry NCERT Solutions Chapter 10: The s-Block Elements Question 1. What are the common physical and chemical features of alkali metals ? Answer: Property Li Na K Rb Cs Fr Atomic number 3 11 19 37 55 87 Atomic mass (g mol-1) 6-94 22-99 39-10 85-47 132-91 (223) Atomic (Metallic) radius (pm) 152
Class 11 Chemistry NCERT Solutions Chapter 9: Hydrogen Question 1. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration. Answer: Position of Hydrogen in the Periodic Table In the periodic table, hydrogen has been placed at the top of the alkali metals in group 1 although it
Class 11 Chemistry NCERT Solutions Chapter 8: Redox Reactions Question 1. Assign oxidation numbers to the underlined elements in each of the following species ; (a) NaH2PO4 (b) NaHSO4 (c) H4P2O7 (d) K2MnO4 (e) CaO2 (f) NaBH4 (g) H2S2O7 (h) KAl(SO4)2.12H2O Answer: Question 2. What are the oxidation numbers of the underlined elements in
Class 11 Chemistry NCERT Solutions Chapter 7: Equilibrium Question 1. A liquid is in equilibrium with its vapours in a sealed container at a fixed temperature. The volume of the container is suddenly increased, (i) What is the initial effect of the change on the vapour pressure ? (ii) How do the rates of
Class 11 Chemistry NCERT Solutions Chapter 6: Thermodynamics Question 1. 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: (ii) whose value is independent
Class 11 Chemistry NCERT Solutions Chapter 5: States of Matter Solids, Liquids and Gases Question 1. What will be the minimum pressure required to compress 500 dm3 of air at 1 bar to 200 dm3 at 30° C ? Answer: From the given data : P1 = 1 bar P2 = ? V1 = 500 dm3 V2 = 200 dm3 P1V1 =
