STD 12 -8.1. Aldehydes and ketones — JEE STD 11 Science — Question

$Cu(s) + 2Ag^+(aq) \to Cu^{2+}(aq) + 2Ag(s)$

$E^o = 0.46\,V$ at $298\,K$ is approximately 

Statements $I$ : $SbCI _5$ is more covalent than $SbCI _3$

Statements $II$: The higher oxides of halogens also tend to be more stable than the lower ones.

In the light of the above statements, choose the most appropriate answer from the options given below

$Z{n^{2 + }} + 2e \to Zn,{E^o} = - 0.762\,V$

$M{g^{2 + }} + 2e \to Mg,{E^o} = - 2.37\,V$

When zinc dust is added to the solution of $MgC{l_2}$

$X + Y\mathop {\xrightarrow{{NaOH}}}\limits_{5\,^oC} \begin{array}{*{20}{c}}
  {OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - CH - CH - CHO} \\ 
  {\,\,\,\,\,\,\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(X)$ and $(Y)$ will respectively be :

$ \mathrm{Ag}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag} ; \mathrm{E}_{\text {red }}^{\circ}=0.8 \mathrm{~V} $

$ \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{H}_2 \mathrm{O} \rightarrow \text { Gluconic acid }\left(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_7\right)+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} ; \mathrm{E}_{\text {oxd }}^{\circ}=-0.05 \mathrm{~V} $

$ \mathrm{Ag}\left(\mathrm{NH}_3\right)_2^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}(\mathrm{s})+2 \mathrm{NH}_3 ; \mathrm{E}_{\text {red }}^{\circ}=0.337 \mathrm{~V}$

[Use $2.303 \times \frac{\mathrm{RT}}{\mathrm{F}}=0.0592$ and $\frac{\mathrm{F}}{\mathrm{RT}}=38.92$ at $298 \mathrm{~K}$ ]

$1.$ $2 \mathrm{Ag}^{+}+\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Ag}(\mathrm{s})+\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_7+2 \mathrm{H}^{+}$

Find $\ln \mathrm{K}$ of this reaction.

$(A)$ $66.13$  $(B)$ $58.38$  $(C)$ $28.30$  $(D)$ $46.29$

$2.$ When ammonia is added to the solution, $\mathrm{pH}$ is raised to $11$ . Which half-cell reaction is affected by $\mathrm{pH}$ and by how much?

(A) $E_{\text {oxd }}$ will increase by a factor of $0.65$ from $E_{\text {oxd }}^{\circ}$

(B) $E_{\text {oxd }}$ will decrease by a factor of $0.65$ from $E_{\mathrm{cod}}^{\prime}$

(C) $\mathrm{E}_{\text {red }}$ will increase by a factor of $0.65$ from $\mathrm{E}_{\text {rod }}^{\circ}$

(D) $E_{\text {red }}$ will decrease by a factor of $0.65$ from $E_{\text {rod }}^2$

$3.$   Ammonia is always is added in this reaction. Which of the following must be incorrect?

$(A)$ $\mathrm{NH}_3$ combines with $\mathrm{Ag}^{+}$to form a complex.

$(B)$ $\mathrm{Ag}\left(\mathrm{NH}_3\right)_2^{+}$is a stronger oxidising reagent than $\mathrm{Ag}^{+}$.

$(C)$ In absence of $\mathrm{NH}_3$ silver salt of gluconic acid is formed.

$(D)$ $\mathrm{NH}_3$ has affected the standard reduction potential of glucose/gluconic acid electrode.

Give the answer question $1,2$ and $3.$