Explore topic-wise InterviewSolutions in Class 11.

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.

1.

The quantitative relationship between the vapor pressure `p` of a liquid and the absolute temperature `T` is given by the Clausius - Clapeyron equation, `In_(p) = - (Delta_(vap)H)/(RT) + C` where `In` is the natural logarithm , `R` is the gas constant `(8.314 JK^(-1) mol^(-))` , and `C` is a constant . The plot ofA. `In_(p)` against `1//T` will be a straight lineB. `In_(p)` against `T` will be a straight lineC. `In_(p)` against `1//T` will be a parbolaD. `In_(p)` against `T` will be a parabola

Answer» Correct Answer - A<br>The Clausius -Clapeyron equation has the form of the linear equation `y = mx + b`:<br> <br> By plotting `In_(p)` versus `1//T`, we obtain a straight line with slope (which is negative) equal to `-Delta_(Vap) H//R`.
Discussion
2.

The relative rates of diffusion of ozone as compared to chlorine is `6 : 5`. If the density of `Cl_(2)` is `35.5`, find out the density of ozone.

Answer» `(r_(1))/(r_(2))=sqrt((d_(2))/(d_(1)))`<br> `(6)/(5)=sqrt((35.5)/(d_(1)))`<br> `:. d_(1)=24.65`
Discussion
3.

Assertion: A lighter gas diffuse more rapidly than a heavier gas. Reason: At a given temperature, the rate of diffusion of a gas is inversely proportional to the square root of its density.A. If both (`A`) and (`R`) are correct and (`R`) is the correct explanation of (`A`).B. If both (`A`) and (`R`) are correct, but (`R`) is not the correct explanation of (`A`).C. If (`A`) is correct, but (`R`) is incorrect.D. If (`A`) is incorrect, but (`R`) is correct.

Answer» Correct Answer - A::B::C::D<br>Rate of diffusion `prop sqrt((1)/("Molecular mass"))`. Hence lighter gas moves rapidly than heavier gas molecules.
Discussion
4.

Which will diffuse faster, ammonia of `CO_(2)` ? What are their relative rates of diffusion?

Answer» `M_(NH_(3))=17,M_(CO_(2))=44.` As rate `propsqrt(1//M)` hence `NH_(3)` will diffuse faster<br> `therefore(r_(NH_(3)))/(r_(CO_(2)))=sqrt((M_(CO_(2)))/(M_(NH_(3))))=sqrt((44)/(17))=1.609`
Discussion
5.

The ratio of rates of diffusion of `SO_(2)`, `O_(2)` and `CH_(4)` isA. `1: sqrt(2):2`B. `1:2:4`C. `2:sqrt(2):1`D. `1:2:sqrt(2)`

Answer» Correct Answer - A<br>`r_(SO_(2)): r_(O_(2)):r_(CH_(4))=(1)/(sqrt(M_(SO_(2)))):(1)/(sqrt(M_(O_(2)))): (1)/(sqrt(M_(CH_(4))))`<br> `(1)/(sqrt(64:32:16))=(1)/(sqrt(4:2:1))`<br> `(1)/(2):(1)/(sqrt(2)):(1)/(1), (2)/(sqrt(2)):(2)/(1), 1:sqrt(2):2`
Discussion
6.

The rates of diffusion of `SO_(3), CO_(2), PCl_(3)` and `SO_(2)` are the following order:A. `PCl_(3) gt SO_(3) gt SO_(2) gtCO_(2)`B. `CO_(2) gt SO_(2) gt PCl_(3) gt SO_(3)`C. `SO_(2) gt SO_(3) gt PCl_(3) gt CO_(2)`D. `CO_(2) gt SO_(2) gt SO_(3) gt PCl_(3)`

Answer» Correct Answer - D<br>Rates of diffusion `prop(1)/(sqrt("Molar Mass"))`
Discussion
7.

A vessel contains `0.1 mol e of He, 0.1` mole of `O_(2)` and `0.3` mole of `N_(2)`. The total pressure is `1` atomosphere. The pressure exerted by `O_(2)` isA. `380 "mm of Hg"`B. `456 "mm of Hg"`C. `304 "mm of Hg"`D. `152 "mm of Hg"`

Answer» Correct Answer - D<br>Total moles `=0. 1(He)+0.1(O_(2))+0.3(N_(2))= 0.5 "moles"`<br> Pressure exerted by `O_(2)=` mole fraction of `O_(2)xx "total pressure"`<br> `(0.1)/(0.5)xx1=(1)/(5)xx760= 152 mm Hg`
Discussion
8.

Air open vessel at `127^(@)C` is heated until `1//5^(th)` of air in it has been expelled. Assuming that the volume of vessel remains constant the temperature to which the vessel has been heated isA. `177^(@)C`B. `277^(@)C`C. `377^(@)C`D. `477^(@)C`

Answer» Correct Answer - D<br>Under similar conditions<br> `n_(1)T_(1)=n_(2)T_(2)`<br> `n_(1)xx600=(4)/(5)n_(1)xxT_(2)`<br> `T_(2)= 750 K`<br> `T_(2)= 477^(@)C`
Discussion
9.

Assertion : In Maxwell - Boltzmann distribution of speeds , the curve broadens at higher temperature . Reason : At a particular temperature , the individual speed of molecules as well as the distribution of speeds remains the same .A. If both assertion and reason are true and reason is the correct explanation of assertion .B. If both assertion and reason are true but reason is not the correct explanation of assertion .C. If assertion is true but reason is false .D. If both assertion and reason are false .

Answer» Correct Answer - C<br>Speed distribution curve broadens at higher temperature because number of molecules moving at higher speed increases. At a particular temperature, the individual speed of molecules keeps changing but the distribution of speeds remains same.
Discussion
10.

Equal weights of methane and hydrogen are mixed in an empty container at `25^(@)C`. The fraction of the total pressure exerted by hydrogen isA. `(1)/(2)`B. `(8)/(9)`C. `(1)/(9)`D. `(16)/(17)`

Answer» Let `16 g` of both be mixed.<br> Mole of `H_(2)=(16)/(2)=8`<br> Mole of `CH_(4)=(16)/(16)=1`<br> Mole fraction of `H_(2)=(8)/(1+8)=(8)/(9)`<br> Which is also the fraction of total pressure executed by `H_(2)`.
Discussion
11.

Equal weights of methane and oxygen are mixed in an empty container at `25^(@)C`. The fraction of the total pressure exerted by oxygen isA. `1//3`B. `1//2`C. `2//3`D. `(1//3)(273//298)`

Answer» Correct Answer - A
Discussion