Question

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?
(i) Its specific heat capacity is greater in the solid state than in the liquid state.
(ii) Its specific heat capacity is greater in the liquid state than in the solid state.
(iii) Its latent heat of vaporization is greater than its latent heat of fusion.
(iv) Its latent heat of vaporization is
smaller than its latent heat of fusion.

• A. $\left(i\right),\left(iii\right)$
• B. $\left(i\right),\left(iv\right)$
• C. $\left(ii\right),\left(iii\right)$
• D. $\left(iii\right),\left(iv\right)$

Answer 1

The correct option is C $\left(ii\right),\left(iii\right)$

From graph we can say temperature is increasing, then curve becomes horizontal, which suggests phase transition and once it’s done its temperature further increases and then once again, we see another phase transition.
So, we can say initially substance was in solid state, then liquid and gas at the end.
Since slope of solid state is more than that in liquid state, so specific heat of matter is greater in liquid state than in solid state.
The transition from solid to liquid state takes lesser time, hence latent heat is smaller.
$\left(ii\right)$ and $\left(iii\right)$ conclusions are correct.

FINAL ANSWER: (b).