Chemistry Class-11: Chapter –9. Hydrogen Part – 6
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Question: 53
With the help of suitable examples, explain the property of that is responsible for its bleaching action?
Question: 54
Why is water molecule polar?
Question: 55
Why does water show high boiling point as compared to hydrogen sulphide? Give reasons for your answer.
Question: 56
Why can dilute solutions of hydrogen peroxide not be concentrated by heating? How can a concentrated solution of hydrogen peroxide be obtained?
Question: 57
Why is hydrogen peroxide stored in wax lined bottles?
Question: 58
Why does hard water not form lather with soap?
Question: 59
Phosphoric acid is preferred over sulphuric acid in preparing hydrogen peroxide from peroxides. Why?
Question: 60
How will you account for 104.5° bond angle in water?
Question: 61
Write redox reaction between fluorine and water.
Question: 62
Write two reactions to explain amphoteric nature of water.
IV. Matching Type
Question: 63
Correlate the items listed in Column I with those listed in Column II. Find out as many correlations as you can.
| Column I | Column II | ||
| (i) | Synthesis gas | (a) |
|
| (ii) | Dihydrogen | (b) | Oxidising agent |
| (iii) | Heavy water | (c) | Softening of water |
| (iv) | Calgon | (d) | Reducing agent |
| (v) | Hydrogen peroxide | (e) | Stoichiometric compounds of s-block elements |
| (vi) | Salt like hydrides | (f) | Prolonged electrolysis of water |
| (g) |
| ||
| (h) |
| ||
| (i) | Synthesis of methanol | ||
| (j) | Mixture of and | ||
Answer:
Question: 65
Match the terms in Column I with the relevant item in Column II
| Column I | Column II | ||
| (i) | Electrolysis of water produces | (a) | Atomic reactor |
| (ii) | Lithium aluminium hydride is used as | (b) | Polar molecule |
| (iii) | Hydrogen chloride is a | (c) | Recombines on metal surface to generate high temperature |
| (iv) | Heavy water is used in | (d) | Reducing agent |
| (v) | Atomic hydrogen | (e) | Hydrogen and oxygen |
Answer:
Question: 66
Match the items in Column I with the relevant item in Column II
| Column I | Column I | ||
| (i) | Hydrogen peroxide is used as a | (a) | Zeolite |
| (ii) | Used in Calgon method | (b) | Perhydrol |
| (iii) | Permanent hardness of hard water is removed by | (c) | Sodium hexametaphosphate |
| (d) | Propellant | ||
Answer: