Download JEE Advanced 2025 Chemistry Question Paper - 2

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SECTION 1 (Maximum Marks:12)

• This section contains FOUR (04) questions.
• Each question has FOUR options (A), (B), (C) and (D). ONLY ONE of these four options is the correct answer.
• For each question, choose the option corresponding to the correct answer.
• Answer to each question will be evaluated according to the following marking scheme:
  
  • Full Marks: +3 If ONLY the correct option is chosen;
  • Zero Marks: 0 If none of the options is chosen (i.e. the question is unanswered);
  • Negative Marks: -1 In all other cases.

1. During sodium nitroprusside test of sulphide ion in an aqueous solution, one of the ligands coordinated to the metal ion is converted to
    
   1. NOS^{-}$
   2. $SCN^{-}$
   3. $SNO{-}$
   4. $NCS^{-}$
2. The complete hydrolysis of $ICl$, $ClF_3$ and $BrF_5$, respectively, gives
    
   1. $IO^{-}$, $ClO_2^{-}$ and $BrO_3^{-}$
   2. $IO_3^{-}$, $ClO_2^{-}$ and $BrO_3^{-}$
   3. $IO^{-}$, $ClO^{-}$ and $BrO_2^{-}$
   4. $IO_3^{-}$, $ClO_4^{-}$ and $BrO_2^{-}$
3. Monocyclic compounds P, Q, R and S are the major products formed in the reaction sequencesgiven below.
   
   
   
   
   
   The product having the highest number of unsaturated carbon atom(s) is
    
   1. P
   2. Q
   3. R
   4. S
4. The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is
   1. 
      
   2. 
      
   3. 
      
   4. 
      

SECTION 2 (Maximum Marks:16)

• This section contains FOUR (04) questions.
 
• Each question has FOUR options (A), (B), (C) and (D). ONE OR MORE THAN ONE of these four option(s) is(are) correct answer(s).
 
• For each question, choose the option(s) corresponding to (all) the correct answer(s).
 
• Answer to each question will be evaluated according to the following marking scheme:
     
   
  • Full Marks: +4 ONLY if (all) the correct option(s) is(are) chosen;
   
  • Partial Marks: +3 If all the four options are correct but ONLY three options are chosen;
   
  • Partial Marks: +2 If three or more options are correct but ONLY two options are chosen, both of which are correct;
   
  • Partial Marks: +1 If two or more options are correct but ONLY one option is chosen and it is a correct option;
   
  • Zero Marks: 0 If none of the options is chosen (i.e. the question is unanswered);
   
  • Negative Marks: -2 In all other cases.
 
• For example, in a question, if (A), (B) and (D) are the ONLY three options corresponding to correct answers, then
  choosing ONLY (A), (B) and (D) will get +4 marks;
  choosing ONLY (A) and (B) will get +2 marks;
  choosing ONLY (A) and (D) will get +2 marks;
  choosing ONLY (B) and (D) will get +2 marks;
  choosing ONLY (A) will get +1 mark;
  choosing ONLY (B) will get +1 mark;
  choosing ONLY (D) will get +1 mark;
  choosing no option (i.e. the question is unanswered) will get 0 marks; and choosing any other combination of options will get -2 marks.

5. The correct statement(s) about intermolecular forces is(are)
    
   1. The potential energy between two point charges approaches zero more rapidly than the potential energy between a point dipole and a point charge as the distance between them approaches infinity.
   2. The average potential energy of two rotating polar molecules that are separated by a distance $r$ has $1/r^3$ dependence.
   3. The dipole-induced dipole average interaction energy is independent of temperature.
   4. Nonpolar molecules attract one another even though neither has a permanent dipole moment.
6. The compound(s) with $P-H$ bond(s) is(are)
    
   1. $H_3PO_4$
   2. $H_3PO_3$
   3. $H_4P_2O_7$
   4. $H_3PO_2$
7. For the reaction sequence given below, the correct statement(s) is(are)
   
   
   
    
   1. Both X and Y are oxygen containing compounds.
   2. Y on heating with $CHCl_3/KOH$ forms isocyanide.
   3. Z reacts with Hinsberg’s reagent.
   4. Z is an aromatic primary amine.
8. For the reaction sequence given below, the correct statement(s) is(are)
   
   
   
    
   1. P is optically active.
   2. S gives Bayer’s test.
   3. Q gives effervescence with aq. $NaHCO_3$.
   4. R is an alkyne.

SECTION 3 (Maximum Marks:32)

• This section contains EIGHT (08) questions.
• The answer to each question is a NUMERICAL VALUE.
• For each question, enter the correct integer corresponding to the answer using the mouse and the on- screen virtual numeric keypad in the place designated to enter the answer.
• If the numerical value has more than two decimal places, truncate/round-off the value to TWO decimal places.
• Answer to each question will be evaluated according to the following marking scheme:
  
  • Full Marks: +4 If ONLY the correct integer is entered;
  • Zero Marks: 0 In all other cases.

9. The density (in $g cm^{-3}$) of the metal which forms a cubic close packed (ccp) lattice with an axial distance (edge length) equal to $400 pm$ is ______.
   Use: Atomic mass of metal = $105.6 amu$ and Avogadro’s constant = $6 × 10^{23} mol^{-1}$
10. The solubility of barium iodate in an aqueous solution prepared by mixing 200 $mL$ of 0.010 $M$barium nitrate with 100 $mL$ of 0.10 $M$ sodium iodate is $X × 10^{-6} mol dm^{-3}$. The value of $X$ is ______.
    Use: Solubility product constant $(K_{sp})$ of barium iodate = $1.58 × 10^{-9}$
11. Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from 10 $mg g^{-1}$ and 16 $mg g^{-1}$ aqueous phenol solutions, the concentrations of adsorbed phenol are measured to be 4 $mg g^{-1}$ and 10 $mg g^{-1}$, respectively. At this temperature, the concentration (in $mg g^{-1}$) of adsorbed phenol from 20 $mg g^{-1}$ aqueous solution of phenol will be ______.
    Use: $log_{10} 2 = 0.3$
12. Consider a reaction $A + R ⟶ Product $. The rate of this reaction is measured to be $k[A][R]$. At the start of the reaction, the concentration of $R$, $[R]_0$, is 10-times the concentration of $A$, $[A]_0$. The reaction can be considered to be a pseudo first order reaction with assumption that $k[R] = k′$ is constant. Due to this assumption, the relative error (in %) in the rate when this reaction is 40 % complete, is ______.
    [$k$ and $k′$ represent corresponding rate constants]
13. At $300 K$, an ideal dilute solution of a macromolecule exerts osmotic pressure that is expressed in terms of the height $(h)$ of the solution (density = 1.00 $g cm^{-3}$) where $h$ is equal to 2.00 $cm$. If the concentration of the dilute solution of the macromolecule is 2.00 $g dm^{-3}$, the molar mass of the macromolecule is calculated to be $X × 10^4 g mol^{-1}$. The value of $X$ is ______.
    Use: Universal gas constant $(R)$ = $8.3 J K^{-1} mol^{-1}$ and acceleration due to gravity $(g)$ = $10 m s^{-2}$
14. An electrochemical cell is fueled by the combustion of butane at 1 $bar$ and 298 $K$. Its cell potential is$\frac{X}{F} × 10^3 volts$, where F is the Faraday constant. The value of $X$ is ______.
    Use: Standard Gibbs energies of formation at 298 $K$ are: $∆_fG°_{CO_2}$= −394 $kJ mol^{-1}$; $∆_fG°_{water}$=−237 $kJ mol^{-1}$; $∆_fG°_{butane}$ = −18 $kJ mol^{-1}$
15. The sum of the spin only magnetic moment values (in $B.M.$) of [$Mn(Br)_6]^{3-}$ and $[Mn(CN)_6]^{3-}$ is _____.
16. A linear octasaccharide (molar mass = 1024 $g mol^{-1}$) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is 58.26 % (w/w) of the total amount of the monosaccharides produced in the hydrolyzed products. The number of ribose unit(s) present in one molecule of octasaccharide is ______.
    Use: Molar mass (in $g mol^{-1}$): ribose = 150, 2-deoxyribose = 134, glucose = 180;
    Atomic mass (in amu): $H$ = 1, $O$ = 16

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