\(A°\) \(m\) for \(NaCl\), \(HCl\) and \(NaAc\) are \(126.4, 425.9\) and \(91.0\) \(S\) \(cm^2 \) \(mol^{-1 }\)respectively. Calculate \(A°\) for \(HAc\)
- \(390.5\) \(S\; cm^2 \;mol^{-1}\)
- \(643.3\) \(S\) \(cm^2\) \(mol^{-1}\)
- \(461.3\) \(S\) \(cm^2\) \(mol^{-1}\)
- \(208.5\) \(S\) \(cm^2\) \(mol^{-1}\)
The Correct Option is A
Solution and Explanation
=\(∧\degree m(HCl)+∧\degree m(NaAc)−A\degree m(NaCl)\)
=\((425.9+91.0−126.4)\)\(S\) \(cm^2mol^{−1}\)
=\(390.5\) \(S\) \(cm^2\) \(mol^{−1}\)
Hence, the correct option is (A): \(390.5\) \(S\) \(cm^2\) \(mol^{−1}\)
Top Questions on Electrochemistry
- State Faraday’s second law of electrolysis. How much electricity is required in terms of Faraday for the reduction of 1 mole of $Cr_2\text{O}_7^{2-} \text{ to Cr}^{3+}$?
- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
- Using \( E^\circ \) values of X and Y given below, predict which is better for coating the surface of iron to prevent corrosion and why?
Given: \( E^\circ_{X^{2+}/X} = -2.36 \, \text{V} \) \( E^\circ_{Y^{2+}/Y} = -0.14 \, \text{V} \) \( E^\circ_{Fe^{2+}/Fe} = -0.44 \, \text{V} \)- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
- State the following:
Faraday’s first law of electrolysis- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
- State the following:
Kohlrausch law of independent migration of ions- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
- Complete and balance the following chemical equations:
(a) \[ 2MnO_4^-(aq) + 10I^-(aq) + 16H^+(aq) \rightarrow \]
(b) \[ Cr_2O_7^{2-}(aq) + 6Fe^{2+}(aq) + 14H^+(aq) \rightarrow \]- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
Questions Asked in CUET exam
- A person walks 10 m North, then turns right and walks 5 m, then turns right again and walks 10 m. What direction is he facing now?
- CUET (UG) - 2025
- Direction sense
- In a certain code, WATER is written as YCVGT. How is HOUSE written?
- CUET (UG) - 2025
- Coding Decoding
- The wavelength of the first line in the Balmer series of hydrogen spectrum is 656 nm. What is the wavelength of the second line?
- CUET (UG) - 2025
- Bohr’s Model for Hydrogen Atom
The following data shows the number of students in different streams in a school:
Which type of graph is best suited to represent this data?- CUET (UG) - 2025
- Income and Employment
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)- CUET (UG) - 2025
- Number Series
Concepts Used:
Electrochemical Cells
An electrochemical cell is a device that is used to create electrical energy through the chemical reactions which are involved in it. The electrical energy supplied to electrochemical cells is used to smooth the chemical reactions. In the electrochemical cell, the involved devices have the ability to convert the chemical energy to electrical energy or vice-versa.
Classification of Electrochemical Cell:
Cathode
- Denoted by a positive sign since electrons are consumed here
- A reduction reaction occurs in the cathode of an electrochemical cell
- Electrons move into the cathode
Anode
- Denoted by a negative sign since electrons are liberated here
- An oxidation reaction occurs here
- Electrons move out of the anode
Types of Electrochemical Cells:
Galvanic cells (also known as Voltaic cells)
- Chemical energy is transformed into electrical energy.
- The redox reactions are spontaneous in nature.
- The anode is negatively charged and the cathode is positively charged.
- The electrons originate from the species that undergo oxidation.
Electrolytic cells
- Electrical energy is transformed into chemical energy.
- The redox reactions are non-spontaneous.
- These cells are positively charged anode and negatively charged cathode.
- Electrons originate from an external source.