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Hydrogen

Short 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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Long 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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Short Answer Type

126.
Why is water an excellent solvent for ionic and polar compounds?

‘Like dissolves like’ is the general rule of solubility. It means polar substances dissolve in polar solvents and non-polar substances dissolve in non-polar solvents. Water is a highly polar solvent and interacts with polar or ionic substances effectively with the liberation of a considerable amount of energy i.e. it is responsible for breaking the crystal lattice and hence explains the solubility. also, A high value of dielectric constant (78.39 C²/Nm²) and dipole moment make water a universal solvent. Water has the ability to dissolve ionic compounds in it. Because of the ion-dipole interaction.

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