Ncert Solutions Chemistry Class 11th
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14.5. Statues and monuments in India are affected by acid rain. How?
14.5. Statues and monuments in India are affected by acid rain. How?
This is mainly due to the large number of industries and power plants in the nearby areas. Acid rain has vapours of sulphuric acid dissolved in it. When it comes in contact with various statues or monuments, the acid reacts chemically with marble (calcium carbonate).
CaCO3 + H2SO4 à CaSO4&n
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3.26. What are major differences between metals and non-metals?
3.26. What are major differences between metals and non-metals?
3.26.
Metals | Non-metals |
1. They have strong tendency to lose electrons to form cations. | 1. They have strong tendency to accept electrons to form anions. |
2. Metals are strong reducing agents. | 2. They are strong oxidising agents. |
3. Metals have low ionization enthalpies. | 3. Non-metals have high ionization enthalpies. |
4. They form basic oxides and ionic compounds. | 4. They form acidic oxides and covalent compounds. |
Upvote 14.4. List gases which are responsible for greenhouse effect.
14.4. List gases which are responsible for greenhouse effect.
CO2 is mainly responsible for the greenhouse effect. Other greenhouse gases are methane, nitrous oxide, water vapours, CFCs (chlorofluorocarbons) and Ozone.
Upvote 14.3. Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?
14.3. Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?
Carbon monoxide binds to haemoglobin to form carboxyhaemoglobin, which is about 300 times more stable than the oxygen-haemoglobin complex. In blood, when the concentration of carboxyhaemoglobin reaches about 3–4 per cent, the oxygen-carrying capacity of blood is greatly reduced. This oxygen deficien
Upvote 14.2. Explain the tropospheric pollution in 100 words?
14.2. Explain the tropospheric pollution in 100 words?
Tropospheric pollution occurs due to the presence of undesirable solid or gaseous particles in the air. The following are the major gaseous and particulate pollutants present in the troposphere:
1. Gaseous air pollutants: These are oxides of sulphur, nitrogen and carbon, hydrogen sulphide, hydrocarbo
Upvote 3.25. Would you expect the first ionization enthalpies of two isotopes of the same element to be the same or different? Justify your answer.
3.25. Would you expect the first ionization enthalpies of two isotopes of the same element to be the same or different? Justify your answer.
3.25. Isotopes have same number of electrons and protons, only the number of neutrons is different. The atomic number remains the same and only atomic mass differs. Hence the ionization energy of the isotopes of a chemical element remains the same.
Upvote Environmental chemistry is a branch of environmental studies. Environmental studies deal with the sum of all social, economical, biological, physical and chemical interrelations with our surroundings. Environmental chemistry deals with the study of the origin, transport, reactions, effects and fates
Upvote 3.24. Describe the theory associated with the radius of an atom as it:
(a) Gains an electron (b) Loses an electron?
3.24. Describe the theory associated with the radius of an atom as it:
(a) Gains an electron (b) Loses an electron?
3.24. (a) Gain of an electron leads to the formation of an anion. The size of an anion will be larger than that of the parent atom because the addition of one or more electrons would result in increased repulsion among electrons and decrease in effective nuclear charge.
(b) Loss of an electron
Upvote 3.23. How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?
3.23. How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?
3.23. On Pauling scale, the electronegativity of nitrogen is 3.0 which indicates that it is quite electronegative. But it is not correct to say that the electronegativity of nitrogen in all the compounds is 3. It varies with the atoms that N is bonded with. For example, in NH3, N has a differen
Upvote 3.22. What is basic difference between the terms electron gain enthalpy and electro negativity?
3.22. What is basic difference between the terms electron gain enthalpy and electro negativity?
3.22. Electron gain enthalpy refers to tendency of an isolated gaseous atom to accept an additional electron to form a negative ion. Whereas electronegativity refers to tendency of the atom of an element to attract shared pair of electrons towards it in a covalent bond.
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