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Hydrogen

Short Answer Type

31.

Can hard water be used for drinking purposes?

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32.

Hard water is not suitable for washing purposes, Why?

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33.

What is zeolite ?

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34.

Can sodium bicarbonate make water hard?

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35.

What is calgon?

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36.

How temporary hardness of water is removed?

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37.

Which would you predict to have higher electrical conductivity - pure water or pure D₂O?

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38.
Explain why water has high melting and boiling points as compared to H₂S.

It is due to the association of water molecules by intermolecular hydrogen bonding. When hydrogen is attached to an electronegative atom like oxygen, the oxygen pulls the electrons closer to itself giving it a partial negative charge and leaving hydrogens with a partial positive charge. The partial charges are attracted to each other, so the hydrogens of one water molecule are attracted to the oxygen of another. This extra bond allows the water to absorb more energy. H₂S does not show this property.

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