vii) Choose the correct alternative and complete the paragraph. (4°C, contracts, minimum, expends, volume, 0°C to 4ºC) In general, when liquid is heated upto a certain temperature, it ------- and when cooled it --------- If we beat water from 0°C upto --------- it contracts instead of expanding. At 4°C its volume is -------- If the water is heated further, it expands and its volume increases. The behaviour of water between its temperature from ------- is called anomalous behaviour of water.
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Answer:
Assertion
When liquid water is cooled, it contracts until a temperature of approximately 4 oC is reached. After that, it expands slightly until it reaches the freezing point.
Reason
The distance between the H−O bond is more than the O−O bond in the water. Hence, the water freezing over into ice is held together not by the O−O attraction but by the H−O attraction.
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