Ncert Solutions Chemistry Class 11th
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Why can dilute solutions of hydrogen peroxide not be concentrated by heating? How can a concentrated solution of hydrogen peroxide be obtained?
Why can dilute solutions of hydrogen peroxide not be concentrated by heating? How can a concentrated solution of hydrogen peroxide be obtained?
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Hydrogen peroxide cannot be concentrated by heating as it can cause bumps on heating. It can be extracted with water and concentrated to ~30% (by mass) by distillation under reduced pressure. It can be further concentrated to ~85% b
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Why does water show a high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
Why does water show a high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
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Water has a significantly higher boiling point than hydrogen sulphide because of the presence of strong hydrogen bonds between water molecules, which are absent in hydrogen sulphide due to the lower electronegativity of sulfur
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Water molecules are polar because in the gas phase water is a bent molecule with a bond angle of 104.5°, O-H bond length of 95.7 pm. Oxygen is more elsectronegative (EN = 3.5 ) than hydrogen (EN= 2.1 ) hence, O-H bond is polar
Upvote With the help of suitable examples, explain the property of H2O2 that is responsible for its bleaching action?
With the help of suitable examples, explain the property of H2O2 that is responsible for its bleaching action?
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H2O2 decomposes slowly on exposure to light.
2H2O2→ 2H2O+2O2
In daily life it is used as a hair bleach and as a mild disinfectant. As an antiseptic it is sold in the market as perhydrol.
Upvote An acidic solution of hydrogen peroxide behaves as an oxidising as well as reducing agent. Illustrate it with the help of a chemical equation.
An acidic solution of hydrogen peroxide behaves as an oxidising as well as reducing agent. Illustrate it with the help of a chemical equation.
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(i) Oxidising action in acidic medium:
2Fe2+ (aq)+2H+ (aq)+H2O2 (aq) → 2Fe3+ (aq)+2H2O (l)
PbS (s)+4H2O2 (aq) → PbSO4 (s)+4H2O (l)
(ii) Reducing action in acidic medium:
2MnO4-+6H++5H2O2 → 2Mn2++8H2O+5O2
HOCl+H2O2 → H3O++Cl-+H2O
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H2O2 structure in gas phase, dihedral angle is 111.50. H2O2 structure in solid phase at 110 k, dihedral angle is 90.20.
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Heavy water can be used as a moderator in nuclear reactors and in exchange reactions for the study of reaction mechanisms. It can be prepared by exhaustive electrolysis of water or as a by-product in some fertilizer industries.
Upvote Basic principle of hydrogen economy is transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with the chemical equation if required.
Basic principle of hydrogen economy is transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with the chemical equation if required.
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Hydrogen economy (Hydrogen as fuel):
(i) The electricity cannot be stored in automobiles. It is not possible to store and transport nuclear energy. Hydrogen is an alternative source of energy and hence called the 'hydrogen economy".
Upvote Why is the ionisation enthalpy of hydrogen higher than that of sodium?
Why is the ionisation enthalpy of hydrogen higher than that of sodium?
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In sodium the last shell electron is in 3s1 after losing that electron, it can acquire the configuration of Ne. Whereas in hydrogen, the electron is in s-orbital.
Upvote Hydrogen generally forms covalent compounds. Give a reason.
Hydrogen generally forms covalent compounds. Give a reason.
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Because of ionization enthalpy, hydrogen resembles more with halogens, is 520 kJ mol-1, F is 1680 kJ mol-1and that of His 1312 kJ mol-1. Like halogens, it forms a diatomic molecule, combining with elements to form hydrides and a lar
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