When a solid melts, there is:

Important Questions on Thermodynamics

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 10

For the reaction, ${\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)⟶2{\mathrm{NH}}_3\left(\mathrm{g}\right)$. Which of the following is correct?

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 12

Latent heat of vaporisation of a liquid at $500 \mathrm{K}$ and $1 \mathrm{atm}$ pressure is $10.0 {\mathrm{kcal}}^{-1} {\mathrm{mol}}^{-1}$. What will be the change in internal energy $\left(\mathrm{\Delta E}\right)$ of $3 \mathrm{mol}$ of liquid at the same temperature?

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 14

If a reaction involves only solids and liquids, which of the following is true?

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 18

When $229$ $\mathrm{J}$ of energy is supplied as heat at constant pressure to $3$ $\mathrm{mol}$ $\mathrm{Ar}\left(\mathrm{g}\right)$, the temperature of the sample is increased by $2.55$ $\mathrm{K}$. Calculate the molar heat capacity at constant volume:-

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 21

Change in entropy is negative for:

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 23

$5$ mole of an ideal gas expand reversibly from a volume of $8 {\mathrm{dm}}^3$ to $80 {\mathrm{dm}}^3$ at a temperature of $27°\mathrm{C}$. The change in entropy is :

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 24

The latent heat of vaporization of water at $100°\mathrm{C}$ is $540 \mathrm{cal} {\mathrm{g}}^{-1}.$  Calculate the increase in entropy when one mole of water at $100°\mathrm{C}$ has evaporated.

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>BEGINNER'S BOX>Q 26

If. ${\mathrm{\Delta G}}^{\circ }>0$ for a reaction then :