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

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With strongly active non-metals such as fluorine or chlorine, water acts as weak reductant and thus releases dioxygen.

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

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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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