Equilibrium MCQs for NEET — Chemistry Questions with Answers

solubility of salt having smaller anion increases down the group and larger anion decreases down.

(b) Gases show deviation from ideal gas behaviour when the temperature is low and pressure is high. At low temperature, the volume of one molecule is not negligible in comparison to total volume and intermolecular force of attraction is maximum at low temperature and high pressure.

(b) The conditions for triple point of H₂O.

the particular temperature and pressure at which the solid, liquid, and gaseous phases of a given substance are all at equilibrium with one another.

H3BO3 is a Lewis acid that can accept an electron pair to form a conjugate base. The removal of a proton from H3BO3 leads to the formation of the conjugate base H2BO3-, which is a tetrahedral oxoanion containing a boron atom with a formal negative charge.

(b)  PCl₅ (g) $\rightleftharpoons$ PCl₃ (g) + Cl₂ (g)

         1               0              0

        1-$\mathrm{\alpha }$             $\mathrm{\alpha }$              $\mathrm{\alpha }$ 

.^..   K_p = $\frac{{\mathrm{\alpha }}^2}{(1-\mathrm{\alpha })}\left[\frac{\mathrm{P}}{1+\mathrm{\alpha }}\right]=\frac{{\mathrm{\alpha }}^2\mathrm{P}}{1-{\mathrm{\alpha }}^2}$

         or $\alpha =\sqrt{\frac{K_p}{P}}$ if 1-${\mathrm{\alpha }}^2$=1

(b)    Given :  $\frac{{\mathit{K}}_{{\mathit{P}}_{\mathit{1}}}}{{\mathit{K}}_{{\mathit{P}}_{\mathit{2}}}}$ = 1/9     and ${\alpha }_{\mathit{x}}\mathit{=}{\alpha }_{\mathit{z}}$

        $$\begin{gathered} \mathrm{X} \rightleftharpoons 2\mathrm{Y} \\ 1 0 \\ 1-\mathrm{\alpha } 2\mathrm{\alpha } \end{gathered}$$      .^..     $K_{P_{\mathit{1}}}\mathit{ }\mathit{=}\mathit{ }\frac{\mathit{(}\mathit{2}{\alpha }_x{\mathit{)}}^{\mathit{2}}}{\mathit{(}\mathit{1}\mathit{-}{\alpha }_x\mathit{)}}\mathit{ }\mathrm{x}\mathit{ }{\left[\frac{P_{\mathit{1}}}{\mathit{1}\mathit{+}\mathit{ }{\alpha }_x}\right]}^{\mathit{1}}$        

         $$\begin{gathered} \mathrm{Z} \rightleftharpoons \mathrm{P} + \mathrm{Q} \\ 1 0 \\ 1-\mathrm{\alpha } 2\mathrm{\alpha } \end{gathered}$$    .^..      $K_{P_2}\mathit{ }\mathit{=}\mathit{ }\frac{\mathit{(}{\alpha }_z{\mathit{)}}^{\mathit{2}}}{\mathit{(}\mathit{1}\mathit{-}{\alpha }_z\mathit{)}}\mathit{ }\mathrm{x}\mathit{ }{\left[\frac{P_2}{\mathit{1}\mathit{+}\mathit{ }{\alpha }_z}\right]}^{\mathit{1}}$                                                                            

                          .^..           P₁/P₂ = $\frac{{\mathit{K}}_{{\mathit{P}}_{\mathit{1}}}}{{\mathit{K}}_{{\mathit{P}}_{\mathit{2}}}}$x 1/4 = 1/9 x 1/4 = 1/36

For $A\left(\mathrm{s}\right)\stackrel{ }{\rightleftharpoons }2B\left(\mathrm{g}\right) + 3C\left(\mathrm{g}\right).$

$$\begin{gathered} \therefore {\mathrm{K}}_{\mathrm{c}}={\left[\mathrm{C}\right]}^3{\left[\mathrm{B}\right]}^2; \mathrm{if} \left[\mathrm{C}\right] \mathrm{becomes} \mathrm{twice}, \\ \mathrm{Then} \mathrm{let} \mathrm{conc}. \mathrm{of} \mathrm{B} \mathrm{becomes} \mathrm{B}\text{'} \mathrm{then} \\ {\mathrm{K}}_{\mathrm{c}}={\left[2\mathrm{C}\right]}^3{\left[\mathrm{B}\text{'}\right]}^2 \\ \mathrm{or} {\left[\mathrm{C}\right]}^3.{\left[\mathrm{B}\right]}^2={\left[2\mathrm{C}\right]}^3{\left[\mathrm{B}\text{'}\right]}^2 \\ \therefore \frac{\left[\mathrm{B}\text{'}\right]}{\left[\mathrm{B}\right]}=\frac{1}{8}=\frac{1}{2\sqrt{2}} \end{gathered}$$

(c) $\mathit{∆}n$=1-1-1/2 = -1/2

      .^..    K_p =K_c(RT)^-1/2