Download App

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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
$2 \,mole$ of zinc is dissolved in $HCl$ at $25\,^oC$ the work done in open vessel is
  • A
    $-2.477 \,kJ$
  • ✓
    $-4.955\, kJ$
  • C
    $0.0489\, kJ$
  • D
    $2.477\, kJ$
✓

Answer

Correct option: B.
$-4.955\, kJ$
b
${\text{Zn}}({\text{s}}) + 2{\text{HCl}}({\text{aq}} - ) \to {\text{ZnC}}{{\text{l}}_2}({\text{aq}} - ) + {{\text{H}}_2}({\text{g}})$

$For\,2\,mol\,\Delta n = 2 - 0 = 2$

${\text{w}} =  - \Delta {\text{nRT}}$

$ =  - 2 \times 8.31 \times 298\,{\text{J}}$

$ =  - 4952.76\,{\text{J}}$

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

When $l =$3 then total value of mis:
→
Which of the following used for the conversion of $2-$ hexyne into trans  $-2-$ hexane
→
The number of electrons that are paired in oxygen molecule is
→
The bond dissociation enthalpy of $H_2(g)$ and $N(g)$ are $436\  kJ\ mol^{-1}$ and $940\  kJ\ mol^{-1}$ and enthaply of formation of $NH_3$ is $- 45\  kJ\  moI^{-1}$ . The enthaply of atomisation of $NH_3$ is.....$kJ\  mol^{-1}$
→
Complete combustion of $0.858\;g$ of compound $X$ gives $2.63\;g$ of $C{O_2}$ and $1.28\;g$ of ${H_2}O$. The lowest molecular mass $X$ can have ............ $\mathrm{g}$
→
$2\,mol$ of zinc is dissolved in $HCl$ at $25\,^oC$. The work done is open vessel
→
$4\,g$ $NH_4NO_3$ were dissolved in $196\, g$ water at constant pressure in calorimeter with heat capacity $160\,J\,K^{-1}$. The temperature fell by $1.3\, K$. Specific heat of solution is $4.2\, J\,K^{-1}\,g^{-1}$. Enthalpy of solution of $NH_4NO_3$ is.......$ kJ\, mol^{-1}$
→
Which of the following undergo friedal craft reaction
→
What is the radius ratio for $2^{nd}$ orbit of $Li^{+2}$ ion $3^{rd}$ orbit of $Be^{+3}$ ion ?
→
The stepwise formation of $\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$ is given below

$Cu ^{2+}+ NH _{3} \stackrel{ K _{1}}{\rightleftharpoons}\left[ Cu \left( NH _{3}\right)\right]^{2+}$

$\left[ Cu \left( NH _{3}\right)\right]^{2+}+ NH _{3} \stackrel{ K _{2}}{\rightleftharpoons}\left[ Cu \left( NH _{3}\right)_{2}\right]^{2+}$

$\left[ Cu \left( NH _{3}\right)_{2}\right]^{2+}+ NH _{3} \stackrel{ K _{3}}{\rightleftharpoons}\left[ Cu \left( NH _{3}\right)_{3}\right]^{2+}$

$\left[ Cu \left( NH _{3}\right)_{3}\right]^{2+}+ NH _{3} \stackrel{ K _{4}}{\rightleftharpoons}\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$

The value of stability constants $K _{1}, K _{2}, K _{3}$ and $K _{4}$ are $10^{4}, 1.58 \times 10^{3}, 5 \times 10^{2}$ and $10^{2}$ respectively. The overall equilibrium constants for dissociation of $\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$ is $x \times 10^{-12}$ The value of $x$ is ...............

(Rounded off to the nearest integer)

→