CUET 2026 Chemistry May 22 Shift 1 Question Paper- Download Answer Key and Solution PDF

A first-order reaction has a specific rate constant (\( k \)) equal to \( 2.303 \times 10^{-3} s^{-1} \). Calculate the exact time required for the initial concentration of the reactant to be reduced to exactly \( \frac{1}{10} \)th of its original value.

• (A) \( 100 s \)
• (B) \( 2303 s \)
• (C) \( 1000 s \)
• (D) \( 693 s \)

Which of the following carbonyl compounds will undergo a self-oxidation and self-reduction reaction (Cannizzaro Reaction) when treated with a concentrated solution of a strong base (\( NaOH \))?

• (A) Acetaldehyde (\( CH_3CHO \))
• (B) Benzaldehyde (\( C_6H_5CHO \))
• (C) Acetone (\( CH_3COCH_3 \))
• (D) Propanal (\( CH_3CH_2CHO \))

Determine the spin-only magnetic moment value for a central divalent manganese gaseous ion (\( Mn^{2+} \)) based on its d-orbital electron distribution. (Atomic Number of \( Mn = 25 \))

• (A) \( 4.90 BM \)
• (B) \( 1.73 BM \)
• (C) \( 3.87 BM \)
• (D) \( 5.92 BM \)

An organic amine compound 'X' reacts smoothly with Hinsberg's reagent (Benzenesulfonyl chloride) to form a solid precipitate. This precipitate remains completely insoluble when treated with an aqueous sodium hydroxide (\( NaOH \)) solution. Classify the amine 'X'.

• (A) Primary Amine
• (B) Secondary Amine
• (C) Tertiary Amine
• (D) Quaternary Ammonium Salt

According to IUPAC coordination nomenclature rules, what is the correct official name for the coordination compound represented by \( [Co(NH_3)_5(Cl)]Cl_2 \)?

• (A) Chloridopentaamminecobaltic chloride
• (B) Pentaaminechloridocobalt(II) dichloride
• (C) Pentaaminechloridocobalt(III) chloride
• (D) Pentaamminedichloridocobalt(III) chloride

Which of the following statement options accurately describes the structural carbohydrate linkages present inside a standard molecule of Sucrose?

• (A) It contains a standard C-1 to C-4 glycosidic bridge linking two identical \(\alpha\)-D-glucose rings together.
• (B) It features a glycosidic linkage connecting the C-1 carbon of an \(\alpha\)-D-glucose unit to the C-2 carbon of a \(\beta\)-D-fructose unit.
• (C) It consists of a C-1 to C-4 linkage binding a \(\beta\)-D-galactose ring directly onto a neighboring glucose molecule.
• (D) It is formed by a continuous chain of \(\beta\)-D-glucose blocks linked entirely via C-1 to C-6 branch channels.

What is the correct official unit measurement scale used to represent Molar Conductivity (\( \Lambda_m \)) profiles within electrolytic systems?

• (A) \( S cm^{-2} mol^{-1} \)
• (B) \( S^{-1} cm^2 mol \)
• (C) \( \Omega cm^2 mol^{-1} \)
• (D) \( S cm^2 mol^{-1} \)

The steady, progressive decrease in the atomic and ionic radii of transition metals along the lanthanide series (Lanthanide Contraction) is primarily caused by:

• (A) A continuous decrease in the absolute nuclear proton count within the central atomic cores.
• (B) The exceptionally poor shielding effect of the diffuse \(4f\)-electrons, which allows the increasing nuclear charge to pull the outer electron shell inward.
• (C) The strong shielding ability of the \(5d\)-electrons completely blocking the nuclear pull.
• (D) A sudden jump in the principal quantum number of the outer valence shells.

Identify which of the following heterocyclic nitrogenous bases is found exclusively within the macromolecular structure of RNA, and is completely absent in standard double-stranded DNA structures.

• (A) Thymine
• (B) Adenine
• (C) Uracil
• (D) Cytosine

During an electrochemistry lab session, a student uses the Nernst Equation to calculate the cell potential (\( E_{cell} \)) of a galvanic system at a non-standard temperature. Which parameter option accurately defines the scaling behavior of the cell potential relative to changes in the reaction quotient (\( Q \))?

• (A) As the concentration of product ions increases relative to reactant ions (increasing \( Q \)), the value of \( E_{cell} \) decreases.
• (B) The value of \( E_{cell} \) increases linearly with an increase in the value of \( Q \).
• (C) The value of \( E_{cell} \) remains completely independent of any concentration shifts in \( Q \).
• (D) An increase in \( Q \) causes an exponential jump in the net electrical voltage produced.