4 April Chemistry JEE Main 2025 Question Paper OUT with Answer Key Session 2

1

Maximum IE and minimum IE of group 13 elements

B, In

2

Total number of electrons in chromium (Z = 24) for which the value of azimuthal quantum number (I) is 1 and 2.

17

3

x is a peptide which is hydrolysed to 2 amino acids y and z. y when react with HNO2 gives lactic acid. z when heated gives cyclic structure as below:

y and z respectively are:

Alanine and Glycine

4

Statement-I: CIF ₃ has 3 possible structures
Statement-II: III is most stable structure due to least Ip-bp repulsion.

Statement-l is correct and statement-ll is incorrect

5

Consider the following graph between Rate Constant (K) and 1/T.

6

Arrange the following carbocation in decreasing order of their stability

A > C > B > D

7

Consider the following complex ions
(a) Ni(CO) ₄
(b) [Ni(CN) ₆ ] ^2-
(c) [FeF ₆ ] ^3-
(d) [CoF ₆ ] ^3-
Which of the following order is correct for their unpaired electrons

c > d > a = b

8

The correct IUPAC name of the following compound is:

4-Hydroxyhept-1-en-6-yne

Given below are two statements:
Statement-I: Aqueous KOH gives elimination reaction as major product always.
Statement-II: Alcoholic KOH eliminates H ⁺ from ẞ-carbon atom
In the light of the above statements, choose the correct answer from the options given below:

Consider the following zero order reaction :
A → Products
Half-life of the reaction is 1 hr if initial concentration of the reactant is 2 mol/L. Find the half-life of the reaction in minutes if the initial concentration of the reaction is 0.5 mol/L.

If x mg of Mg(OH) ₂ is added in 1 L of solution to make a solution with pH = 10, then find the value of x.
[Given: MW of Mg(OH) ₂ = 58 g/mol]
Assume Mg(OH) ₂ dissociates completely in water.

Which of the following is the ratio of 5 ^th Bohr orbit (r ₅ ) of He ⁺ & Li ²⁺ ?

Incorrect order of atomic radius is:

In the reaction sequence:

The compound (Z) is:

One mole of an ideal gas expands from 10dm ³ to 20dm ³ through isothermal reversible process. Find ΔU, q & w

Observe the following diagram.

For reverse osmosis, which of the following can be used for porous membrane?

Which of the following is correct option regarding 1s orbital?

Total number of stereoisomers possible for complexes [Cr(Cl ₃ )(Py) ₃ ] and [CrCl ₂ (C ₂ O ₄ ) ₂ ] respectively are

In lead storage battery during charging oxidation state of lead show changes
at anode from x ₁ to y ₁
at cathode from x ₂ to y ₂
Find value of x ₁ , y ₁ , x ₂ , y ₂

Which of the following compound is not a product of intramolecular aldol condensation reaction?

0.01 M HX (K _a = 4 × 10 ^-10 ) is diluted till the solution has pH = 6. If the new concentration is x * 10 ^-4 M, then find x.

Consider the reaction A+B → Product
R = k[A] ^m [B] ⁿ
When conc. of A & B taken are A ₁ & B ₁ respectively, then rate of reaction is R ₁ . When conc. of A & B taken are 2A ₁ & B ₁ /2 then rate of reaction is R ₂ . Find R ₂ /R ₁ ?

The complex ion having crystal field stabilization energy is zero and value of spin only magnetic moment is 5.92 BM.

Statement II: C1 – C2 bond length in (A) is longer than (B)
In the light of above statements, choose the correct option:

In following sequence of reaction. A is converted to D.

D is treated with A followed by hydrolysis to give 2,3-dimethyl-butan-2-ol. Then identify A, B, C.

The activation energy of forward reaction and backward reaction is 100 kJ/mole and 180 kJ/mole respectively. Find the correct statement if catalyst is added under same condition of temperature.

KMnO ₄ oxidises others in acidic medium, Difference between two oxidation states of Mn is x. Neutral FeCl ₃ reacts with oxalate to form a complex compound having y-d-electrons. Find x + y.

In Duma's method for estimation of N, 0.5 g of an organic compound gave 150 mL of N ₂ collected at 300 K and 900 mmHg pressure (Aq tension is 15 mm Hg). Find % of N.

Given below is a sample of DNA strand
5' GGCAATGCTACAG 3"
Find the number of hydrogen bonds prevent in this DNA strand.

A sample of 150 kg wheat contains Fe-metal. Find mass of FeSO ₄ .7H ₂ O in g. so that sample contains 12 ppm Fe-metal. (Atomic mass of Fe = 55.85 g/mol)