Chapter 14 Environment Chemistry (पर्यावरणीय रसायन)
Chapter 14 Environment Chemistry (पर्यावरणीय रसायन) पाठ के अन्तर्गत दिए गए प्रश्नोत्तर प्रश्न 1. पर्यावरणीय रसायन शास्त्र को परिभाषित कीजिए। उत्तर विज्ञान की वह शाखा जिसके अन्तर्गत पर्यावरणीय प्रदूषण, और पर्यावरण में होने वाली विभिन्न प्रकार की रासायनिक और प्रकाश रासायनिक अभिक्रियाओं का अध्ययन किया जाता है, पर्यावरणीय रसायन शास्त्र कहलाता है। प्रश्न 2. क्षोभमण्डलीय प्रदूषण […]
Chapter 14 Environmental Chemistry
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 pollution is caused by both […]
Chapter 13 Hydrocarbons
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 methane, all the four hydrogen atoms […]
Chapter 12 Organic Chemistry : Some Basic Principles and Techniques
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) C6H6 (2) C6H12 (3) CH2C12 (4) CH3NO2 (5) HCONHCH3 (6) CH2=C=CH2Answer: Question 3. […]
Chapter 11 The p-Block Elements
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. + 1 oxidation state increases from […]
Chapter 10 The s-Block Elements
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) 152 186 227 248 265 — […]
Chapter 9 Hydrogen
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 is not a member of the group. […]
Chapter 8 Redox Reactions
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 each of the following and how […]
Chapter 7 Equilibrium
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 evaporation and condensation change initially ? […]
Chapter 6 Thermodynamics
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 of path Question 2. For the process […]