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(C) The horizontal parts of the heating curve represent phase changes where the temperature remains constant despite the continuous supply of heat. Th

Vedclass · Accepted Answer

Its latent heat of vaporization is greater than its latent heat of fusion.

Vedclass · Answer

(C) The horizontal parts of the heating curve represent phase changes where the temperature remains constant despite the continuous supply of heat. The length of these horizontal segments is proportional to the latent heat required for the phase change.$1$. In the provided graph,there is one horizontal segment representing a phase change (e.g.,melting or vaporization). However,looking at the slope of the temperature-time graph,the slope is given by $\frac{dT}{dt} = \frac{P}{ms}$,where $P$ is the power (rate of heat supply),$m$ is the mass,and $s$ is the specific heat capacity.$2$. Since $P$ and $m$ are constant,the specific heat capacity $s$ is inversely proportional to the slope $(s \propto \frac{1}{	ext{slope}})$.$3$. The graph shows a single sloping line. If we compare the latent heat segments (if multiple were present),we would compare their lengths. Given the options,we evaluate the latent heat of vaporization vs fusion. In standard heating curves for substances like water,the latent heat of vaporization is significantly larger than the latent heat of fusion. Thus,the horizontal segment corresponding to vaporization is longer than the one for fusion. Therefore,the conclusion that the latent heat of vaporization is greater than the latent heat of fusion is correct.

Column-$I$	Column-$II$
$A$. Conversion of liquid into solid is	$1$. Regelation
$B$. Conversion of liquid into vapour is	$2$. Sublimation
$C$. Conversion of solid into vapour directly is	$3$. Fusion
$D$. Melting of ice caused by pressure is	$4$. Vaporisation

Heat is supplied to a certain homogeneous sample of matter at a uniform rate. Its temperature is plotted against time,as shown. Which of the following conclusions can be drawn?

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