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Practice each question, then open the answer or worked solution.
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
Option (iii) and (iv) are the answers.
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
H2 gas is formed. It is known as ____________.
(i) Water-gas
(ii) Syngas
(iii) Producer gas
(d) Industrial gas
Option (i) and (ii) are the answers.
Which of the following statement(s) is/are correct in the case of heavy water?
(i) Heavy water is used as a moderator in a nuclear reactor.
(ii) Heavy water is more effective as a solvent than ordinary water.
(iii) Heavy water is more associated than ordinary water.
(iv) Heavy water has a lower boiling point than ordinary water.
Option (i) and (iii) are the answers.
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 a cation in ionic salts.
(iii) The hydrogen ion, H+, exists freely in solution.
(iv) Dihydrogen does not act as a reducing agent.
Option (i) and (ii) are the answers.
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.Solution:
Option (iii) and (iv) are the answers.
Solution coming soon.
The 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
Option (i) and (ii) are the answers.
Which of the following statements is correct?
(i) Elements of group 15 form electron deficient hydrides.
(ii) All elements of group 14 form electron precise hydrides.
(iii) Electron precise hydrides have tetrahedral geometries.
(iv) Electron rich hydrides can act as Lewis acids.
Option (ii) and (iii) are the answers.
Which of the following statements is correct?
(i) Hydrides of group 13 act as Lewis acids.
(ii) Hydrides of group 14 are electron deficient hydrides.
(iii) Hydrides of group 14 act as Lewis acids.
(iv) Hydrides of group 15 act as Lewis bases.
Option (i) and (iv) are the answers.
Which of the following statements is correct?
(i) Metallic hydrides are deficient of hydrogen.
(ii) Metallic hydrides conduct heat and electricity.
(iii) Ionic hydrides do not conduct electricity in solid-state.
(iv) Ionic hydrides are very good conductors of electricity in solid-state.
Option (i), (ii) and (iii) are the answers.
III. Short Answer Type
How can production of hydrogen from water gas be increased by using water
gas shift reaction?
The water shift gas reaction is used in the formation of synthesis gas (hydrogen and carbon monoxide or carbon dioxide mixture. Here CO is converted to CO2 and H2 is also obtained from water.