A) heated above\[{{4}^{o}}C\]
B) cooled below\[{{4}^{o}}C\]
C) both heated and cooled above and below\[{{4}^{o}}C\]respectively
D) none of the above
Correct Answer: C
Solution :
Certain substances do not expand but contract when heated within a certain range of temperature water is such a substance. Density of water is maximum at \[{{4}^{o}}C\] so it volume is minimum at this temperature. If water initially at a temperature. If water is heated above\[{{4}^{o}}C\], its volume increases. Now on cooling when above \[{{4}^{o}}C\] it contracts, till on cooling below \[{{4}^{o}}C\] its volume increases instead of decreasing, this is known as anomalous expansion of water. Since volume increases water will over flow.
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