Download App

Electrochemistry — Chemistry STD 12 Science — Question

Gujarat 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→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

How would you account for the following:
  1. Many of the transition elements and their compounds can act as good catalysts.
  2. The metallic radii of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second series.
  3. There is a greater range of oxidation states among the actinoids than among the lanthanoids.
→
Give information about C-O-H bond angle in alcohol, phenol and ether with suitable example.
→
Account for any two of the following:
  1. Amines are basic substances while amides are neutral.
  2. Nitro compounds have higher boiling points than the hydrocarbons having almost the same molecular mass.
  3. Aromatic amines are weaker bases than aliphatic amines.
→
Indicate the steps in the preparation of:
K2Cr2O7 from chromite ore.
→
Explain negative deviation from Raoult's law with an example.
→
A first order reaction has a rate constant of 0.0051 min–1. If we begin with 0.10 M concentration of the reactant, what concentration of reactant will remain in solution after 3 hours?
→
When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water, a yellow solution of compound (B) is obtained. After treatment of this yellow solution with sulphuric acid,compound (C) can be crystallised from the solution. When compound (C) is treated with KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reactions.
→
E° values of Mn, Ni and Zn are more negative than expected.
→
Give reasons:
  1. E° value for Mn3+/ Mn2+ couple is much more positive than that for Fe3+/ Fe2+.
  2. Iron has higher enthalpy of atomization than that of copper.
  3. Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
→
Give the plausible explanation for the following:
  1. Glucose doesn't give 2, 4-DNP test.
  2. The two strands in DNA are not identical but are complementary.
  3. Starch and cellulose both contain glucose unit as monomer, yet they are structurally different.
→