The standard electrode potential for Ni²⁺/Ni couple is -0.25 V and for Ag⁺/Ag couple is 0.80 V. These two couples are connected to make an electrochemical cell. The redox reaction is spontaneous. The cell potential will be:
The standard electrode potential for Ni²⁺/Ni couple is -0.25 V and for Ag⁺/Ag couple is 0.80 V. These two couples are connected to make an electrochemical cell. The redox reaction is spontaneous. The cell potential will be:
Show Hint
Remember: E°cell = E°cathode - E°anode
+ 1.05 V
-1.05 V
+ 0.55 V
-0.55 V
The Correct Option is A
Solution and Explanation
E°cell = E°cathode - E°anode = 0.80 V - (-0.25 V) = 1.05 V. Positive means spontaneous.
Top Questions on Electrochemistry
- In an electrochemical cell, the standard electrode potential of \( \text{Zn}^{2+}/\text{Zn} \) is \( -0.76 \, \text{V} \) and that of \( \text{Cu}^{2+}/\text{Cu} \) is \( +0.34 \, \text{V} \). What is the standard EMF of the cell formed by these electrodes?
- MHT CET - 2025
- Chemistry
- Electrochemistry
- What type of cell is mercury cell? Why is it more advantageous than dry cell?
- 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
- Calculate the emf of the following cell at 25°C : \[ \text{Zn(s)} | \text{Zn}^{2+} (0.1 \, \text{M}) \parallel \text{H}^+ (0.01 \, \text{M}) | \text{Hg}(l) | \text{Hg}_2^{2+} (1 \, \text{bar}), \, \text{Pt(s)} \] \[ \left[ E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \, \text{V}, \, E^\circ_{\text{H}_2/\text{H}^+} = 0.00 \, \text{V}, \, \log 10 = 1 \right] \]
- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
- The conductivity of a 0.20 M solution of KCl is \(2.48 \times 10^{-2} \, \text{S cm}^{-1}\). Calculate its molar conductivity and degree of dissociation.
- CBSE CLASS XII - 2025
- Chemistry
- Electrochemistry
Questions Asked in CBSE Compartment XII exam
- In a group activity class, there are 10 students whose ages are 16, 17, 15, 14, 19, 17, 16, 19, 16 and 15 years. One student is selected at random such that each has equal chance of being chosen and age of the student is recorded.
On the basis of the above information, answer the following questions : - Ahousing society wants to commission a swimming pool for its residents. For this, they have to purchase a square piece of land and dig this to such a depth that its capacity is 250 cubic metres. Cost of land is 500 per square metre. The cost of digging increases with the depth and cost for the whole pool is 4000 (depth)2. Suppose the side of the square plot is x metres and depth is h metres.
On the basis of the above information, answer the following questions
Given:- Square plot side = x metres
- Depth = h metres
- Volume = x2h = 250 cubic metres
- Cost of land: 500 per sq.metre
- Cost of digging: 4000 ×h- CBSE CLASS XII - 2023
- CBSE Compartment XII - 2023
- Applications of Derivatives
In an agricultural institute, scientists conduct experiments with varieties of seeds to grow them in different environments for producing healthy plants and obtaining higher yields.
A scientist observed that a particular seed grew very fast after germination. He recorded the growth of the plant from the time of germination and modeled its growth with the function:
Given:
\( f(x) = \frac{1}{3}x^3 - 4x^2 + 15x + 2 \), \( 0 \leq x \leq 10 \)
where \( x \) is the number of days the plant is exposed to sunlight.
On the basis of the above information, answer the following questions:- CBSE CLASS XII - 2023
- CBSE Compartment XII - 2023
- Applications of Derivatives
- Show that the lines
\[ \frac{x + 1}{3} = \frac{y + 3}{5} = \frac{z + 5}{7} \quad \text{and} \quad \frac{x - 2}{1} = \frac{y - 4}{3} = \frac{z - 6}{5} \] intersect and find their point of intersection.- CBSE CLASS XII - 2023
- CBSE Compartment XII - 2023
- Three Dimensional Geometry
- Relation \( R \) on \( A = \{1,2,3,4,5,6,7\} \):
\[ R = \{(a,b) : a \text{ and } b \text{ are both odd or both even} \} \] Show that \( R \) is an equivalence relation and find the equivalence class \([1]\).- CBSE CLASS XII - 2023
- CBSE Compartment XII - 2023
- Relations and Functions