Ncert Solutions Chemistry Class 11th
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Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of
(i) Chlorides of Ca and Mg in water
(ii) Sulphates of Ca and Mg in water
(iii) Hydrogen carbonates of Ca and Mg in water
(iv) Carbonates of alkali metals in water
Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of
(i) Chlorides of Ca and Mg in water
(ii) Sulphates of Ca and Mg in water
(iii) Hydrogen carbonates of Ca and Mg in water
(iv) Carbonates of alkali metals in water
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (ii)
Presence of calcium and magnesium salts in the form of hydrogen carbonate, chloride and sulphate in water makes water 'hard'.
Upvote 
Some of the properties of water are described below. Which of them is/ are not correct?
(i) Water is known to be a universal solvent.
(ii) Hydrogen bonding is present to a large extent in liquid water.
(iii) There is no hydrogen bonding in the frozen state of water.
(iv) Frozen water is heavier than liquid water.
Some of the properties of water are described below. Which of them is/ are not correct?
(i) Water is known to be a universal solvent.
(ii) Hydrogen bonding is present to a large extent in liquid water.
(iii) There is no hydrogen bonding in the frozen state of water.
(iv) Frozen water is heavier than liquid water.
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii) and (iv)
The presence of extensive hydrogen bonding between water molecules gives it remarkable features in the condensed phase (liquid and solid phases). In comparison to H2S and H2Se, this results in a high freezing point,
Upvote Which of the following statements about hydrogen are correct?
(i) Hydrogen has three isotopes of which protium is the most common.
(ii) Hydrogen never acts as cation in ionic salts.
(iii) Hydrogen ion, H+, exists freely in solution.
(iv) Dihydrogen does not act as a reducing agent.
Which of the following statements about hydrogen are correct?
(i) Hydrogen has three isotopes of which protium is the most common.
(ii) Hydrogen never acts as cation in ionic salts.
(iii) Hydrogen ion, H+, exists freely in solution.
(iv) Dihydrogen does not act as a reducing agent.
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (ii)
When an electron is removed from a hydrogen atom, the nucleus decreases to 1.5 × 10-3 pm in size. When compared to usual atomic and ionic sizes of 50 to 200 pm, this is exceedingly small. As a result, H+ does not exis
Upvote Which of the following statement(s) is/are correct in the case of heavy water?
(i) Heavy water is used as a moderator in nuclear reactor.
(ii) Heavy water is more effective as solvent than ordinary water.
(iii) Heavy water is more associated than ordinary water.
(iv) Heavy water has lower boiling point than ordinary water.
Which of the following statement(s) is/are correct in the case of heavy water?
(i) Heavy water is used as a moderator in nuclear reactor.
(ii) Heavy water is more effective as solvent than ordinary water.
(iii) Heavy water is more associated than ordinary water.
(iv) Heavy water has lower boiling point than ordinary water.
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (iii)
Heavy water is utilised as a moderator in nuclear reactors and exchange reactions, and it is more associated with water due to its higher mass.
Upvote Dihydrogen can be prepared on a commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H2gas is formed. It is known as
(i) Water gas
(ii) Syngas
(iii) Producer gas
(iv) Industrial gas
Dihydrogen can be prepared on a commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H2gas is formed. It is known as
(i) Water gas
(ii) Syngas
(iii) Producer gas
(iv) Industrial gas
This is a multiple choice answer as classified in NCERT Exemplar
Option (i) and (ii)
The combination of CO and H2 is known as water gas. This mixture of CO and H2 is also known as synthesis gas or 'syngas' since it is used to make methanol and other hydrocarbons.
Upvote In the following questions two or more options may be correct.
Which of the following statements are not true for hydrogen?
(i) It exists as a diatomic molecule.
(ii) It has one electron in the outermost shell.
(iii) It can lose an electron to form a cation which can freely exist.
(iv) It forms a large number of ionic compounds by losing an electron.
In the following questions two or more options may be correct.
Which of the following statements are not true for hydrogen?
(i) It exists as a diatomic molecule.
(ii) It has one electron in the outermost shell.
(iii) It can lose an electron to form a cation which can freely exist.
(iv) It forms a large number of ionic compounds by losing an electron.
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii) and (iv)
H+ does not exist freely and is always associated with other atoms or molecules. It has an extremely high ionisation enthalpy and does not have metallic properties under normal conditions, unlike alkali metals.
Upvote Only one element forms hydride.
(i) Group 6
(ii) Group 7
(iii) Group 8
(iv) Group 9
Only one element forms hydride.
(i) Group 6
(ii) Group 7
(iii) Group 8
(iv) Group 9
This is a multiple choice answer as classified in NCERT Exemplar
Option (i)
Group 6
From group 6, only chromium forms CrH.
Upvote Elements of which of the following group(s) of periodic table do not form hydrides?
(i) Groups 7, 8, 9
(ii) Group 13
(iii) Groups 15, 16, 17
(iv) Group 14
Elements of which of the following group(s) of periodic table do not form hydrides?
(i) Groups 7, 8, 9
(ii) Group 13
(iii) Groups 15, 16, 17
(iv) Group 14
This is a multiple choice answer as classified in NCERT Exemplar
Option (i)
Groups 7,8, 9
Explanation: The metals belonging to group 7, 8 and 9 do not have tendency to form hydrides.
Upvote Which of the following compounds is used for water softening?
(i) Ca3(PO4)2
(ii) Na3PO4
(iii) Na6P6O18
(iv) Na2HPO4
Which of the following compounds is used for water softening?
(i) Ca3(PO4)2
(ii) Na3PO4
(iii) Na6P6O18
(iv) Na2HPO4
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii)
Na6P6O18
Sodium hexametaphosphate (Na6P6O18), commercially called ‘calgon’, is used to remove hardness from water.
Upvote Which of the following ions will cause hardness in the water sample?
(i) Ca2+
(ii) Na+
(iii) Cl-
(iv) K+
Which of the following ions will cause hardness in the water sample?
(i) Ca2+
(ii) Na+
(iii) Cl-
(iv) K+
This is a multiple choice answer as classified in NCERT Exemplar
Option (i)
Ca2+
Water becomes 'hard' when it contains calcium and magnesium salts in the form of hydrogen carbonate, chloride, and sulphate.
Upvote