Explain why:
Air dissolved in water contains a higher proportion of oxygen.

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Solution

Air consists of $78 %$ nitrogen and $21 %$ oxygen. But oxygen dissolves in water easily than Nitrogen and any other component of air. Hence, water contains a higher portion of oxygen than nitrogen and others.

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Explain why:

(a) Boiled or distilled water taste flat.

(b) Ice at $0^{\circ} C .$ has the greater cooling effect than water at $0^{\circ} C .$

(d) Rainwater does not leave behind concentric rings when boiled.

(e) Air dissolved in water contains a higher proportion of oxygen.

(f) If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.

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