1
JEE Main 2026 (Online) 22nd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$ \text { Match the LIST-I with LIST-II } $$

List-I Thermodynamic Process List-II Magnitude in kJ
A. Work done in reversible, isothermal expansion of 2 mol of ideal gas from 2
<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">dm</mi>

</mrow>

<mn>3</mn>
2
<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">dm</mi>

</mrow>

<mn>3</mn>
2dm^(3)
to 20
<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">dm</mi>

</mrow>

<mn>3</mn>
20
<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">dm</mi>

</mrow>

<mn>3</mn>
20dm^(3)
at 300 K .
I. 4
B. Work done in irreversible isothermal expansion of 1 mol ideal gas from 1
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  <mtext> </mtext>

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</mrow>

<mn>3</mn>
1
<mrow data-mjx-texclass="ORD">

  <mtext></mtext>

  <mi mathvariant="normal">m</mi>

</mrow>

<mn>3</mn>
1m^(3)
to 3
<mrow data-mjx-texclass="ORD">

  <mtext> </mtext>

  <mi mathvariant="normal">m</mi>

</mrow>

<mn>3</mn>
3
<mrow data-mjx-texclass="ORD">

  <mtext></mtext>

  <mi mathvariant="normal">m</mi>

</mrow>

<mn>3</mn>
3m^(3)
at 300 K against a constant pressure of 3 kPa .
II. 11.5
C. Change in internal energy for adiabatic expansion of a 1 mol ideal gas with change of temperature = 320
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<mi mathvariant="normal">K</mi>
= 320
<mtext></mtext>

<mi mathvariant="normal">K</mi>
=320K
and
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    <mi mathvariant="normal">C</mi>

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  <mo accent="true">―</mo>

</mover>

<mrow data-mjx-texclass="ORD">

  <mrow data-mjx-texclass="ORD">

    <mi mathvariant="normal">V</mi>

  </mrow>

</mrow>
=
<mn>3</mn>

<mn>2</mn>
<mi mathvariant="normal">R</mi>
<mover accentunder="false">

  <mrow data-mjx-texclass="ORD">

    <mi mathvariant="normal">C</mi>

  </mrow>

  <mo>¯</mo>

</mover>

<mrow data-mjx-texclass="ORD">

  <mrow data-mjx-texclass="ORD">

    <mi mathvariant="normal">V</mi>

  </mrow>

</mrow>
=
<mn>3</mn>

<mn>2</mn>
<mi mathvariant="normal">R</mi>
bar(C)_(V)=(3)/(2)R
.
III. 6
D. Change in enthalpy at constant pressure of 1 mol ideal gas with change of temperature = 337
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= 337
<mtext></mtext>

<mi mathvariant="normal">K</mi>
=337K
and
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    <mi mathvariant="normal">C</mi>

  </mrow>

  <mo accent="true">―</mo>

</mover>

<mrow data-mjx-texclass="ORD">

  <mrow data-mjx-texclass="ORD">

    <mi mathvariant="normal">p</mi>

  </mrow>

</mrow>
=
<mn>5</mn>

<mn>2</mn>
<mi mathvariant="normal">R</mi>
<mover accentunder="false">

  <mrow data-mjx-texclass="ORD">

    <mi mathvariant="normal">C</mi>

  </mrow>

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<mrow data-mjx-texclass="ORD">

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    <mi mathvariant="normal">p</mi>

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</mrow>
=
<mn>5</mn>

<mn>2</mn>
<mi mathvariant="normal">R</mi>
bar(C)_(p)=(5)/(2)R
.
IV. 7
A

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

B

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

C

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

D

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

2
JEE Main 2026 (Online) 22nd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

'A' is a neutral organic compound (M. F : $\mathrm{C}_8 \mathrm{H}_9 \mathrm{ON}$ ). On treatment with aqueous $\mathrm{Br}_2 / \mathrm{HO}^{(-)}$, ' A ' forms a compound ' B ' which is soluble in dilute acid. ' B ' on treatment with aqueous $\mathrm{NaNO}_2 / \mathrm{HCl}\left(0-5^{\circ} \mathrm{C}\right)$ produces a compound ' C ' which on treatment with $\mathrm{CuCN} / \mathrm{NaCN}$ produces ' D '. Hydrolysis of ' D ' produces ' E ' which is also obtainable from the hydrolysis of ' A '. ' E ' on treatment with acidified $\mathrm{KMnO}_4$ produces ' F '. ' F ' contains two different types of hydrogen atoms. The structure of ' A ' is

A
JEE Main 2026 (Online) 22nd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 21 English Option 1
B
JEE Main 2026 (Online) 22nd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 21 English Option 2
C
JEE Main 2026 (Online) 22nd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 21 English Option 3
D
JEE Main 2026 (Online) 22nd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 21 English Option 4
3
JEE Main 2026 (Online) 22nd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The formal charges on the atoms marked as (1) to (4) in the Lewis representation of $\mathrm{HNO}_3$ molecule respectively are

JEE Main 2026 (Online) 22nd January Morning Shift Chemistry - Chemical Bonding & Molecular Structure Question 19 English

A

$0,0,-1,+1$

B

$0,-1,0,+1$

C

$0,+1,0,-1$

D

$+1,0,0,-1$

4
JEE Main 2026 (Online) 22nd January Morning Shift
Numerical
+4
-1
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Sodium fusion extract of an organic compound $(\mathrm{Y})$ with $\mathrm{CHCl}_3$ and chlorine water gives violet color to the $\mathrm{CHCl}_3$ layer. 0.15 g of $(\mathrm{Y})$ gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound $(\mathrm{Y})$ is

$\_\_\_\_$ . (Nearest integer)

(Given : molar mass $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{Cl}: 35.5, \mathrm{Br}: 80, \mathrm{I}: 127$ )

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