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Ncert Solutions Chemistry Class 11th

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11 months ago

Ncert Solutions Chemistry Class 11th Hydrocarbons

13.1. How do you account for the formation of ethane during chlorination of methane?
0 Follower 23 Views

V
Vishal Baghel

Contributor-Level 10

Chlorination of methane is a free radical reaction which occurs by the following mechanism involving initiation, propagation and termination steps:

From the above mechanism, it is evident that during the propagation step, CH3 free radicals are produced, which may undergo three reactions, i.e., (i), (ii) and (iii). In the chain termination step, the two CH3 free radicals combine to form ethane (CH3—CH3) molecule.

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Environmental chemistry

14.40. Define (a) eutrophication (b) pneumoconiosis (c) Photochemical smog (d) Classical smog
0 Follower 5 Views

V
Vishal Baghel

Contributor-Level 10

(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 the lung.

(c) Photochemical smog: Photochemical smog is formed as a result of the photochemical decomposition of nitrogen dioxide and chemical reactions involving hydrocarbons. It takes place during dry warm season in the presence of sunlight. It is oxidising in nature.           

(d) C

...more

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Environmental chemistry

14.39. What should be the tolerable limit of F ions in drinking water?
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V
Vishal Baghel

Contributor-Level 10

1 ppm or 1 mg dm-3.

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Environmental chemistry

14.38. What are insecticides? Give examples of insecticides.
0 Follower 23 Views

V
Vishal Baghel

Contributor-Level 10

A Toxic substance that is used to kill insects is called an insecticide. For example: DDT, BHC.

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Environmental chemistry

14.7. List out the gases which are considered as major source of air pollution.
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

Carbon monoxide (CO), sulphur dioxide (SO2) and oxides of nitrogen (NO2).

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Environmental chemistry

14.35. Cite examples where green chemistry can be applied.
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

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-friendly chemicals and conditions.

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Classification of Elements and Periodicity in Prop

3.36. The size of isoelectronic species-F–, Ne and Na+ is affected by

(a) Nuclear charge (Z)

(b) Valence principal quantum number (n)

(c) Electron-electron interaction in the outer orbitals

(d) None of the factors because their size is the same
0 Follower 18 Views

P
Payal Gupta

Contributor-Level 10

3.36.  (a) Nuclear charge (Z).

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Environmental chemistry

14.34. What is the full form of PCBs and what are they?
0 Follower 1 View

V
Vishal Baghel

Contributor-Level 10

PCBs are polychlorinated biphenyls. They are contaminants of water. They are used as fluids in transformers and capacitors.

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Classification of Elements and Periodicity in Prop

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
0 Follower 11 Views

P
Payal Gupta

Contributor-Level 10

3.35.  (c) Nuclear mass.

New answer posted

11 months ago

Ncert Solutions Chemistry Class 11th Classification of Elements and Periodicity in Prop

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.
0 Follower 9 Views

P
Payal Gupta

Contributor-Level 10

3.34. Statement (b) is incorrect.

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