Which of the following is/are correct?

Important Questions on States of Matter

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.6>Q 12

Which of the following statements is not correct? 

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 1

The normal boiling point of cyclohexane (enthalpy of vaporization: $30.08 \mathrm{kJ} {\mathrm{mol}}^{-1}$) is $80.75°\mathrm{C}$. What will its vapor pressure be at $25°\mathrm{C}$?

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 2

In the determination of the surface tension of a liquid $\mathrm{A}$ by the drop-number method, equal volumes of $\mathrm{A}$ and water gave $60$ and $20$ drops, respectively. Calculate the surface tension of $\mathrm{A}$ if $\mathrm{\rho }\left(\mathrm{A}\right)=0.86 \mathrm{g} {\mathrm{cm}}^{-3}$ and $\mathrm{\rho }\left(\mathrm{water}\right)=0.996 \mathrm{g} {\mathrm{cm}}^{-3}$. Given: ${\mathrm{\gamma }}_{\mathrm{water}}=72.75\times {10}^{-3} {\mathrm{Nm}}^{-1}$. 

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 3

The viscosity of diethyl ether in millipoise is $2.84$ at $0° \mathrm{C}$ and $2.33$ at $20° \mathrm{C}$. Calculate the activation energy of diethyl ether for viscous flow and its viscosity at $60° \mathrm{C}$. 

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 4

The boiling point of n-heptane is $36°\mathrm{C}$. Estimate its molar heat of vaporisation assuming that it obeys Trouton's rule. (Assume entropy of vaporization=$88 {\mathrm{JK}}^{‐1}{\mathrm{mol}}^{‐1}$. )

HARD

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 5

The surface tension of water is $72.8 \mathrm{dynes} {\mathrm{cm}}^{-1}$. Calculate the energy required to disperse one spherical drop of radius $3.0 \mathrm{mm}$ to  $3.0\times {10}^{-3} \mathrm{mm}$.

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 6

The surface tension of water at $20°\mathrm{C}$ is $72.8 \mathrm{dynes} {\mathrm{cm}}^{-1}$. Calculate the minimum amount of work needed to increase the surface area of water from $2.0 {\mathrm{cm}}^2$ to $5.0 {\mathrm{cm}}^2$ at this temperature.

MEDIUM

JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Physical Chemistry Part 1 JEE Main & Advanced>Chapter 4 - States of Matter>DPP 4.7>Q 7

Which of the following statements regarding a liquid is not correct?