9.19  Consider the reaction of water with F2 and suggest, in terms of oxidation and reduction, which species are oxidized/reduced.

9.20 Complete the following chemical reactions.

(i)PbS(s)+H_{2}O_{2}(aq)\rightarrow

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions 

9.20 Complete the following chemical reactions.

(ii) MnO_{4}^{-}(aq)+H_{2}O_{2}(aq)\rightarrow

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions.

9.20  Complete the following chemical reactions. 

(iii) CaO(s)+H_{2}O(g)\rightarrow

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions

9.20 (iv) Complete the following chemical reactions

AlCl_{3}(g)+H_{2}O(l)\rightarrow

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions. 

9.20 Complete the following chemical reactions 

(v)   Ca_{3}N_{2}(s)+H_{2}O(l)\rightarrow

Classify the above into (a) hydrolysis, (b) redox and (c) hydration reactions

 

 

9.21  Describe the structure of the common form of ice.

9.22  What causes the temporary and permanent hardness of water ? 

9.23  Discuss the principle and method of softening of hard water by synthetic ionexchange resins.

9.24  Write chemical reactions to show the amphoteric nature of water.

9.25  Write chemical reactions to justify that hydrogen peroxide can function as an oxidising as well as reducing agent.

9.26  What is meant by ‘demineralised’ water and how can it be obtained?

9.27 Is demineralized or distilled water useful for drinking purposes? If not, how can it be made useful?

9.28  Describe the usefulness of water in biosphere and biological systems. 

9.29 What properties of water make it useful as a solvent? What types of a compound can it (i) dissolve, and (ii) hydrolyze? 

9.30  Knowing the properties of H2O and D2O, do you think that D2O can be used for drinking purposes? 

9.31  What is the difference between the terms ‘hydrolysis’ and ‘hydration’ ? 

9.32  How can saline hydrides remove traces of water from organic compounds?

9.33 What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water

9.34  Do you expect different products in solution when aluminum (III) chloride and potassium chloride treated separately with (i) normal water (ii) acidified water, and (iii) alkaline water? Write equations wherever necessary. 

9.35  How does H2O2 behave as a bleaching agent?

 

9.36  What do you understand by the terms: (i) hydrogen economy (ii) hydrogenation (iii) ‘syngas’ (iv) water-gas shift reaction (v) fuel-cell ?

10.1 What are the common physical and chemical features of alkali metals ?

10.2 Discuss the general characteristics and gradation in properties of alkaline earth metals

10.3 Why are alkali metals not found in nature ?

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