NEET-UG 2026 · Code 50

An ideal gas is made of polyatomic molecules. Each of the molecules has three translational, three rotational and f number of vibrational modes. If the ratio of heat capacities C_P/C_V of the gas is 8/7, then the value of f is :

1. A4
2. B3
3. C2
4. D1

Given below are two statements: Statement-I : [Fe(ox)₃]³⁻ is chiral. Statement-II : trans-[Cr(H₂O)₂(ox)₂]⁻ is chiral. (Given : oxH₂ = HOOC−COOH) In light of the above statements, choose the most appropriate answer from the options given below:

1. ABoth Statement-I and Statement-II are correct.
2. BBoth Statement-I and Statement-II are incorrect.
3. CStatement-I is correct but Statement-II is incorrect.
4. DStatement-I is incorrect but Statement-II is correct.

In potash alum, the ratio of K⁺ and SO₄²⁻ ions is

1. A1:2
2. B2:1
3. C2:3
4. D3:2

The correct statement about peptides and proteins is

1. ATertiary structure of proteins has two or more polypeptide subunits.
2. BOnly the proteins having a quaternary structure are biologically active.
3. CIn β-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds.
4. DIn α-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds.

The numbers 17.0145 and 21.0235 were rounded to three figures after the decimal point. The resulting numbers, respectively, are

1. A17.014 and 21.023
2. B17.015 and 21.023
3. C17.014 and 21.024
4. D17.015 and 21.024

Among the following options, the correct trend in the electron gain enthalpy is

1. AF > Cl > Br > I
2. BBr > Cl > F > I
3. CCl > F > Br > I
4. DI > Br > Cl > F

Assertion A: For an ideal solution formed by mixing liquids P and Q, Δ_mix H = 0 and Δ_mix V = 0 Reason R: No interactions occur between P and Q In the light of the above statements, choose the most appropriate answer from the options given below.

1. ABoth A and R are correct and R is the correct explanation of A
2. BBoth A and R are correct but R is NOT the correct explanation of A
3. CA is correct but R is not correct
4. DA is not correct but R is correct

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

1. Aleucine
2. Bthreonine
3. Cmethionine
4. Dserine