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

Match List - I with List - II.

Given $V_1$ and $V_2$ are initial and final volumes respectively.

List - I
(Isothermal process)
List - II
(Expression)
A. Reversible expansion I. $$
\mathrm{q}=0
$$
B. Free expansion II. $$
\mathrm{q}=\mathrm{nRT} \ln \frac{\mathrm{~V}_2}{\mathrm{~V}_1}
$$
C. Irreversible Compression III. $$
\mathrm{w}=-\mathrm{p}_{\mathrm{ext}}\left(\mathrm{~V}_1-\mathrm{V}_2\right)
$$
D. Cyclic reversible IV. $$
\frac{\mathrm{q}_{\mathrm{rev}}}{\mathrm{~T}}=0
$$

Choose the correct answer from the options given below :

A

A-II, B-III, C-I, D-IV

B

A-II, B-I, C-IV, D-III

C

A-II, B-I, C-III, D-IV

D

A-I, B-II, C-III, D-IV

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

Given below are two statements :

JEE Main 2026 (Online) 6th April Evening Shift Chemistry - Solutions Question 5 English

Statement I : $\quad \mathrm{H}_2 \mathrm{O}$ molecules move from the chamber 1 to chamber 2 .

Statement II : The osmotic pressure of a solution prepared by dissolving 50 mg of potassium sulphate (molar mass $=174 \mathrm{~g} / \mathrm{mol}$ ) in 2 L of water (at $27^{\circ} \mathrm{C}$ ) is 0.0107 bar. (Given: $\mathrm{R}=0.083 \mathrm{dm}^3$ bar $\mathrm{K}^{-1} \mathrm{~mol}^{-1}$ and assume complete dissociation of electrolyte)

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

3
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

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

4
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.

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