1
JEE Main 2026 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given is a concentrated solution of a weak electrolyte $A_x B_y$ of concentration ' $c$ ' and dissociation constant ' K '. The degree of dissociation is given by :

A

$$ \left[\mathrm{K} \times \mathrm{c}^{x+y-1} x^x y^y\right]^{x+y} $$

B

$$ \left(\frac{\mathrm{K}}{\mathrm{c}^{x+y-1} x^x y^y}\right)^{\frac{1}{x+y}} $$

C

$$ \left(\frac{\mathrm{c}^{x+y-1} x^x y^y}{\mathrm{~K}}\right)^{x+y} $$

D

$$ \left(\frac{c^{x+y-1} x^x y^y}{\mathrm{~K}}\right)^{\frac{1}{x+y}} $$

2
JEE Main 2026 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

For a general redox reaction

Anode $\quad \operatorname{Red}_1 \rightarrow \mathrm{Ox}_1^{\mathrm{n}_1^{+}}+\mathrm{n}_1 \mathrm{e}^{-}$

Cathode $\mathrm{O} x_2+\mathrm{n}_2 \mathrm{e}^{-} \rightarrow \operatorname{Red}_2^{\mathrm{n}_2-}$

Which of the following statement is incorrect?

A

$$ \begin{aligned} & \text { The overall reaction can be written as } \mathrm{n}_2 \operatorname{Red}_1+\mathrm{n}_1 \mathrm{O} x_2 \rightleftharpoons \mathrm{n}_2 \mathrm{O} x_1^{\mathrm{n}_1^{+}}+\mathrm{n}_1 \operatorname{Red}_2^{\mathrm{n}_2^{-}} \\ & \text {} \end{aligned} $$

B

The electrons do not appear in the overall reaction because electrons produced at the anode are consumed at the cathode.

JEE Main 2026 (Online) 6th April Evening Shift Chemistry - Electrochemistry Question 5 English Option 2
C

Here $n$ is the number of electrons transferred in redox reaction.

D

If the reaction is carried out reversibly, the electrical work done is equal to the ratio of charge and potential difference through which charge is moved.

3
JEE Main 2026 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

A

lowest and lowest

B

highest and lowest

C

lowest and highest

D

highest and highest

4
JEE Main 2026 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement I : $\mathrm{F}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{O}<\mathrm{Cl}_2 \mathrm{O}$ is the correct trend in terms of bond angle.

Statement II : $\mathrm{SiF}_4, \mathrm{SnF}_4$ and $\mathrm{PbF}_4$ are ionic in nature.

In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

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