Ncert Solutions Chemistry Class 11th
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13.1. How do you account for the formation of ethane during chlorination of methane?
13.1. How do you account for the formation of ethane during chlorination of methane?
Chlorination of methane is a free radical reaction which occurs by the following mechanism involving initiation, propagation and termination steps:
Upvote 
14.40. Define (a) eutrophication (b) pneumoconiosis (c) Photochemical smog (d) Classical smog
14.40. Define (a) eutrophication (b) pneumoconiosis (c) Photochemical smog (d) Classical smog
(a) Eutrophication: When the growth of algae increases in the surface of water, dissolved oxygen in water is reduced. This phenomenon is known as eutrophication. (Due to this growth of fish gets inhibited).
(b) Pneumoconiosis: It is a disease which irritates lungs. It causes scarring or fibrosis of
Upvote 14.39. What should be the tolerable limit of F ions in drinking water?
14.39. What should be the tolerable limit of F ions in drinking water?
14.38. What are insecticides? Give examples of insecticides.
14.38. What are insecticides? Give examples of insecticides.
A Toxic substance that is used to kill insects is called an insecticide. For example: DDT, BHC.
Upvote 14.7. List out the gases which are considered as major source of air pollution.
14.7. List out the gases which are considered as major source of air pollution.
Carbon monoxide (CO), sulphur dioxide (SO2) and oxides of nitrogen (NO2).
Upvote 14.35. Cite examples where green chemistry can be applied.
14.35. Cite examples where green chemistry can be applied.
Green chemistry can be applied as mentioned in the following examples:
(i) In dry-cleaning, the use of liquefied CO2 in place of tetrachloroethene.
(ii) In the bleaching of paper using hydrogen peroxide instead of chlorine.
(iii) In the manufacture of chemicals like ethanol, using environment-friend
Upvote 14.34. What is the full form of PCBs and what are they?
14.34. What is the full form of PCBs and what are they?
PCBs are polychlorinated biphenyls. They are contaminants of water. They are used as fluids in transformers and capacitors.
Upvote 3.35. Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
(a) Valence principal quantum number (n)
(b) Nuclear charge (Z)
(c) Nuclear mass
(d) Number of core electrons
3.35. Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?
(a) Valence principal quantum number (n)
(b) Nuclear charge (Z)
(c) Nuclear mass
(d) Number of core electrons
3.34. Which of the following statements related to the modem periodic table is incorrect?
(a) The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell.
(b) The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.
(c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
(d) The block indicates value of azimuthal quantum number (l) for the last subshell that received electrons in building up the electronic configuration.
3.34. Which of the following statements related to the modem periodic table is incorrect?
(a) The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell.
(b) The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.
(c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
(d) The block indicates value of azimuthal quantum number (l) for the last subshell that received electrons in building up the electronic configuration.