Download App

5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The work done during reversible isothermal expansion of one mole of hydrogen gas at $25^{\circ} \mathrm{C}$ from pressure of $20 \mathrm{atmosphere} \mathrm{to} 10 \mathrm{atmosphere}$ is

(Given $R=2.0 \mathrm{cal} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ )

  • ✓
     $-413.14$ calories
  • B
     $413.14$ calories
  • C
    $100$ calories
  • D
    $0$ calorie
✓

Answer

Correct option: A.
 $-413.14$ calories
a
$W_{\text {rev, iso }} $$ =-2.303 n R T \log \frac{P_i}{P_f} $

$ =-2.303 \times 1 \times 2 \times 298 \times \log 2 $

$ =-2.303 \times 1 \times 2 \times 298 \times 0.3 $

$ =-413.14 \text { calories }$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 5. Thermodynamics and thermochemistry→5. Thermodynamics and thermochemistry — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The ionic radii of $\mathrm{F}^{-}$ and $O^{2-}$ respectively are $1.33\, A^o$ and $1.4\, A^o$, while the covalent radius of $\mathrm{N}$ is $0.74\,A^o$ 

The correct statement for the ionic radius of $\mathrm{N}^{3-}$ from the following is :

→
Which may be added to one litre of water to act as a buffer
→
The heat of formations of $CO(g)$ and $C{O_2}(g)$ are $ - 26.4$ $kcal $ and $ - 94.0$ $ kcal$  respectively. The heat of combustion of carbon monoxide will be.....$kcal$
→
Oxidation number of sulphur in marshall's acid $(\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8)$ is :
→
Given that the equilibrium constant for the reaction,

$2SO_{2(g)} + O_{2(g)} \rightleftharpoons 2SO_{3(g)}$ 

has a value of $278$ at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature?

$SO_{3(g)}  \rightleftharpoons SO_{2(g)} + \frac{1}{2} O_{2(g)}$

→
Compare rate of dehydration of $(i), (ii)$ and $(iii)$ by conc. $H_2SO_4$
→
When $0.01\,mol$ of an organic compound containing $60\,\%$ carbon was burnt completely, $4.4\,g$ of $CO _2$ was produced. The molar mass of compound is $.........g\,mol ^{-1}$ (Nearest integer)
→
A square planar complex is formed by hybridisation of which atomic orbitals
→
A certain weak base has a dissociation constant $2 \times 10^{-5}$. The equilibrium  constant for its neutralisation reaction with strong acid is
→
Match the coordination number and type of hybridisation with distribution of hybrid orbitals in space based on Valence bond theory.

Coordination number and type of hybridisation Distribution of hybrid orbitals In space
$(a)$ $4, sp ^{3}$ $(i)$ trigonal bipyramidal
$(b)$ $4, dsp ^{2}$ $(ii)$ octahedral 
$(c)$ $5, sp ^{3} d$ $(iii)$ tetrahedral
$(d)$ $6, d ^{2} sp ^{3}$ $(iv)$ square planar

Select the correct option

→