Download App

Electrochemistry — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry2 Marks
Question
Explain construction and uses of conductivity cell.
✓

Answer

→ Conductivity cell consists of two platinum electrodes coated with platinum black (finely divided metallic Pt is deposited on the electrodes electrochemically)
→ These have area of cross section equal to 'A' and are separated by distance 'l'
Image
→ Therefore, solution confined between these electrodes is a column of length / and area of cross section A.
→ The resistance of such a column of solution is then given by the equation:
$R =\rho \frac{l}{A}=\frac{l}{\kappa A }$
→ The quantity //A is called cell constant denoted by the symbol, G*.
→The cell constant is usually determined bymeasuring the resistance of the cell containing a solution whose conductivity is already known.
→ The cell constant, G*, is then given by the equation:
$G ^*= R \kappa=\frac{l}{A}$
→ Once the cell constant is determined, we can use it for measuring the resistance of conductivity of any solution.

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 "Short Answer Type Questions [2M]" from Electrochemistry→Electrochemistry — all question types→Chemistry STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

What is f-block element?
→
→
a. Differentiate between Ideal solution and Non-ideal solution.
b. 30 g of urea is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23.8 mm Hg.
→
Match the items of Column I and Column II.
 
Column I
 
Column II
(i)
Diamond.
(a)
Short interval of time.
(ii)
Instantaneous rate.
(b)
Ordinarily rate of conversion is imperceptible.
(iii)
Average rate.
(c)
Long duration of time.
→
In a pseudo first order hydrolysis of ester in water, the following results were obtained:
t/s 0 30 60 90
[Ester]/mol L-1 0.55 0.31 0.17 0.085
  1. Calculate the average rate of reaction between the time interval 30 to 60 seconds.
  2. Calculate the pseudo first order rate constant for the hydrolysis of ester.
→
Discuss the classification of monohydric alcohols containing Csp2-OH bond.
→
A reaction is first order in A and second order in B.
  1. Write the differential rate equation.
  2. How is the rate affected on increasing the concentration of B three times?
  3. How is the rate affected when the concentrations of both A and B are doubled?
→
Give conversion: Ethene into butane.
→
Calculate the half-life of a first order reaction from their rate constants given below:
  1. 200 s–1
  2. 2 min–1
  3. 4 years–1
→
Explain the displacement equation of diazonium group of benzene diazonium salt by iodide ion and chloride ion.
→