Answer:
The height up to which a liquid rises in a capillary tube is given by \[h=\frac{2\sigma \cos \theta }{r\rho g}\] The surface tension (\[\sigma \]) of hot water is less than that of cold water. Moreover, capillary tube expands in hot water, so its radius r increases. So capillary rise h is smaller in hot water than in cold water.
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