Download App

Electrochemistry — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry3 Marks
Question
Given that $\Lambda^{0}_{\text{m}}(\text{HCl})=426\text{ S cm}^2\text{mol}^{-1},\Lambda^{0}_{\text{m}}(\text{NaCl})\\=126\text{ S cm}^2\text{mol}^{-1}$
$\Lambda^{0}_{\text{m}}(\text{CH}_3\text{COONa})=91\text{ S cm}^2\text{mol}^{-1}$
✓

Answer

$\Lambda^{0}_{\text{m}}(\text{CH}_3\text{COOH})=\Lambda^{0}_{\text{CH}_3\text{COO}^-}+\Lambda^{0}_{\text{H}^+}$
$=\Lambda^{0}_{\text{CH}_3\text{COO}^-}=\Lambda^{0}_{\text{Na}^{+}}+\Lambda^{0}_{\text{H}^{+}}+\Lambda^{0}_{\text{Cl}^{-}}-\Big(\Lambda^{0}_{\text{Na}^{+}}+\Lambda^{0}_{\text{Cl}^{-}}\Big)$
$=\Lambda^{0}_{\text{m(CH}_3\text{COONa})}+\Lambda^{0}_{\text{m(HCl})}-\Lambda^{0}_{\text{m(NaCl})}$
$=(91+426+126)\text{S cm}^2\text{mol}^{-1}$
$=391\text{ S cm}^2\text{mol}^{-1}$

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 "3 Marks Question" from Electrochemistry→Electrochemistry — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Complte the following reaction :
$CH _3 COOH \frac{\text { (i) } X _2 R e d P }{\text { (iii) } H _2 O }$
→
For the reaction:
$2 A+B \rightarrow A_2 B$
the rate $= k [ A ][ B ]^2$ with $k =2.0 \times 10^{-6} mol^{-2} L^2 s^{-1}$. Calculate the initial rate of the reaction when $[ A ]=0.1 mol$ $L ^{-1},[B]=0.2 mol L ^{-1}$. Calculate the rate of reaction after $[ A ]$ is reduced to $0.06 mol L ^{-1}$.
→
Write the products formed when $\ce{CH_3CHO}$ reacts with the following reagents$:$
  1. $\ce{HCN}.$
  2. $\ce{H_2N—OH}.$
  3. $\ce{CH_3CHO}$ in the presence of dilute $\ce{NaOH}.$
→
The rate constant for the first order decomposition of $\ce{H2O2}$ is given by the following equation:$\log{k}=14.2-\frac{\text{1.0}\times\text{10}^{4}}{\text{T}}K$
Calculate $E_a$ for this reaction and rate constant $k$ if its half$-$life period be $200$ minutes.
$($Given: $R = 8.314\ JK^{–1}\ mol^{–1})$
→
Give reasons for the following:
  1. Aniline does not undergo Friedal$-$Crafts reaction.
  2. $(CH_3)_2 NH$ is more basic than $(CH_3)_3 N$ in an aqueous solution.
  3. Primary amines have higher boiling point than tertiary amines.
→
How long will it take an electric current of $0.15 A$ to deposit all the copper from $500 \ ml$ of $0.15 \ M$ copper sulphate solution?
→
For M2+/M and M3+/M2+ systems the $E ^{\circ}$ values for some metals are as follows : 
$\begin{array}{llll} Cr ^{2+} / Cr & -0.9 V & Cr ^3 / Cr ^{2+} & -0.4 V \\ Mn ^{2+} / Mn & -1.2 V & Mn ^{3+} / Mn ^{2+} & +1.5 V \\ Fe ^{2+} / Fe & -0.4 V & Fe ^{3+} / Fe ^{2+} & +0.8 V\end{array}$
Use this data to comment upon :
(i) the stability of Fe3+ in acid solution are compared to that of Cr3+or Mn3+ and
(ii) the case with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
→
Compound with molecular formula $C _4 H _8 O$ reacts with hydrazine and gives hydrazone. It forms iodoform by the reaction with iodine and NaOH but does not react with Fehling solution. Give the structure of this compound and required equations.
→
Give reasons for the following$:$
  1. The transition metals generally form coloured compounds.
  2. $E^\circ$ value for $\ce{(Mn^{3+}|Mn^{2+})}$ is highly positive than that for $\ce{(Cr^{3+}|Cr^{2+})}$ couple.
  3. The chemistry of actinoids elements is not so smooth as that of the lanthanoids.
→
List various types of isomerism possible for coordination compounds, giving an example of each.
→