Describe the usefulness of water in the biosphere and biological

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 Multiple Choice QuestionsShort Answer Type

121. Write chemical reactions to show amphoteric nature of water.
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122.

Give two chemical reactions in which water acts as a reducing agent.

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123.

Give two points to distinguish between fresh tap water and distilled water.

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124.

Water has some air dissolved in it. What is its significance?

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 Multiple Choice QuestionsLong Answer Type

125.

What properties of water make it useful as a solvent? What type of compounds can it: (i) dissolve and (ii) hydrolyse?

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 Multiple Choice QuestionsShort Answer Type

126.

Why is water an excellent solvent for ionic and polar compounds?

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127. What do you understand by the term ‘auto-protolysis’ of water? What is its significance?
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 Multiple Choice QuestionsLong Answer Type

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128. Describe the usefulness of water in the biosphere and biological system.


(i) The high heat of vaporisation and heat capacity of water are responsible for moderation of the climate and body temperature of living beings.

(ii) High specific heat capacity of water enables it to absorb heat of various biochemical and physiological reactions, going on inside the body, with the minimum rise of temperature.

(iii) Water has a high dipole moment (μ = 1.84D). So, water is an ideal medium for the dissolution of a wide variety of compounds.

(iv) Water is an ideal solvent for transportation of minerals and other nutrients for plant and animal metabolism.

(v) Water is an essential component for the photosynthesis in plants which releases O2 in the atmosphere.

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 Multiple Choice QuestionsShort Answer Type

129.

What are the ways in which water molecules are bound to an anhydrous salt to form a hydrate?

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130.

How many hydrogen - bonded water molecule(s) are associated in CuSO4.5H2O? 

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