Answer
Verified
442.2k+ views
Hint: Cell constant denoted by ${G^*}$ is defined as the ratio of the distance between the electrodes to the electrode area . The value of cell constant differs from cell to cell .
Complete step by step answer:
As we know conductivity is given by
$\kappa = G \times \dfrac{l}{a}$
where , G is conductance of solution
l is length of the conductor
and a is the area of cross - section of the conductor .
The measurement of l and a is difficult . However , for a particular cell , $\dfrac{l}{a}$ is constant and this constant is known as cell constant .
Hence , we find out that ${G^*} = \dfrac{l}{a}$ where l is length and a is an area of cross-section of conductor.
Now , since unit of l is $cm$ and unit of a is $c{m^2}$ , we have
${G^*} = \dfrac{{cm}}{{c{m^2}}}$
$ \Rightarrow {G^*} = c{m^{ - 1}}$
Therefore , the unit of cell constant is $c{m^{ - 1}}$ .
So, the correct answer is “Option C”.
Additional Information: If we want to find out the cell constant of any particular cell it can be found out by measuring the conductance of a solution whose conductivity is known . For this purpose we use specific conductivities of $KCl$ solutions which are known accurately at different concentrations and temperatures .
Once the value of cell constant is known , the conductivity of the given solution can be determined by measuring its conductance and multiplying the value with the cell constant .
Note: The value of cell constant remains constant but the value of conductance decreases with increase in temperature due to movement of kernels ( nucleus with inner electrons ) as there is hindrance in the flow of electrons .
Complete step by step answer:
As we know conductivity is given by
$\kappa = G \times \dfrac{l}{a}$
where , G is conductance of solution
l is length of the conductor
and a is the area of cross - section of the conductor .
The measurement of l and a is difficult . However , for a particular cell , $\dfrac{l}{a}$ is constant and this constant is known as cell constant .
Hence , we find out that ${G^*} = \dfrac{l}{a}$ where l is length and a is an area of cross-section of conductor.
Now , since unit of l is $cm$ and unit of a is $c{m^2}$ , we have
${G^*} = \dfrac{{cm}}{{c{m^2}}}$
$ \Rightarrow {G^*} = c{m^{ - 1}}$
Therefore , the unit of cell constant is $c{m^{ - 1}}$ .
So, the correct answer is “Option C”.
Additional Information: If we want to find out the cell constant of any particular cell it can be found out by measuring the conductance of a solution whose conductivity is known . For this purpose we use specific conductivities of $KCl$ solutions which are known accurately at different concentrations and temperatures .
Once the value of cell constant is known , the conductivity of the given solution can be determined by measuring its conductance and multiplying the value with the cell constant .
Note: The value of cell constant remains constant but the value of conductance decreases with increase in temperature due to movement of kernels ( nucleus with inner electrons ) as there is hindrance in the flow of electrons .
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Difference Between Plant Cell and Animal Cell
Give 10 examples for herbs , shrubs , climbers , creepers
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you graph the function fx 4x class 9 maths CBSE
Write a letter to the principal requesting him to grant class 10 english CBSE