Question 26
What is meant by 'demineralised' water and how can it be obtained?

Question 27
Is demineralised or distilled water useful for drinking purposes? If not, how can it be made useful?

Question 29
What properties of water make it useful as a solvent? What types of the compound can it 

(i) dissolve, and (ii) hydrolyse?

Question 30
Knowing the properties of H₂O and D₂O, do you think that D₂O can be used for drinking purposes?

Question 31
What is the difference between the terms 'hydrolysis' and 'hydration'?

Question 32
How can saline hydrides remove traces of water from organic compounds?

Question 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.

Question 34
Do you expect different products in solution when aluminium(III) chloride and potassium chloride treated separately with
(i) normal water
(ii) acidified water, and
(iii) alkaline water?
Write equations wherever necessary.

Question 35
How does H₂O₂ behave as a bleaching agent?

Question 36
What do you understand by the terms:
(i) hydrogen economy
(ii) hydrogenation
(iii) 'syngas'
(iv) water-gas shift reaction
(v) fuel-cell ?