CUET 2026 Chemistry May 19 Shift 1 Question Paper- Download Answer Key and Solution PDF

For a first-order reaction, if the time taken for \(90%\) completion is \(t\), what will be the approximate time taken for \(99.9%\) completion of the same reaction?

• (A) \(2t \)
• (B) \(3t \)
• (C) \(4t \)
• (D) \(1.5t \)

According to collision theory, increasing the starting concentration of a collection of reacting molecules directly results in a change in which of the following system factors?

• (A) Activation energy
• (B) Collision frequency
• (C) Rate constant
• (D) Fraction of molecules with energy greater than activation energy

What is the cell potential (\(E_{cell}\)) for a concentration cell consisting of two hydrogen electrodes at \(298 K\), where the anode compartment is at \(pH = 3\) and the cathode compartment is at \(pH = 1\) under standard pressure conditions?

• (A) \(0.0591 V \)
• (B) \(0.1182 V \)
• (C) \(-0.1182 V \)
• (D) \(0.0000 V \)

Which of the following expressions correctly relates the limiting molar conductivity (\(\Lambda_m^\circ\)) of aluminum sulfate, \(Al_2(SO_4)_3\), to its individual ionic components according to Kohlrausch's Law?

• (A) \(\Lambda_m^\circ = \lambda^\circ(Al^{3+}) + \lambda^\circ(SO_4^{2-}) \)
• (B) \(\Lambda_m^\circ = 2\lambda^\circ(Al^{3+}) + 3\lambda^\circ(SO_4^{2-}) \)
• (C) \(\Lambda_m^\circ = 3\lambda^\circ(Al^{3+}) + 2\lambda^\circ(SO_4^{2-}) \)
• (D) \(\Lambda_m^\circ = \frac{1}{2}\lambda^\circ(Al^{3+}) + \frac{1}{3}\lambda^\circ(SO_4^{2-}) \)

What is the correct increasing order of basic strength for the following amines when measured inside an aqueous medium?
\((I) CH_3NH_2\), \((II) (CH_3)_2NH\), \((III) (CH_3)_3N\), \((IV) NH_3\)

• (A) IV < III < I < II
• (B) IV < I < II < III
• (C) III < I < II < IV
• (D) I < II < III < IV

An organic compound with the molecular formula \(C_7H_8O\) is completely insoluble in water but dissolves readily in an aqueous \(NaOH\) solution. When treated with bromine water, it forms a white precipitate. Identify the compound.

• (A) Benzyl alcohol
• (B) Anisole
• (C) \(o\)-Cresol
• (D) Methoxybenzene

Which of the following coordination complex ions exhibits structural asymmetry leading to optical isomerism?

• (A) \(trans-[Co(en)_2Cl_2]^+ \)
• (B) \(cis-[Co(en)_2Cl_2]^+ \)
• (C) \([Co(NH_3)_4Cl_2]^+ \)
• (D) \([Cr(NH_3)_5Cl]^{2+} \)

Using Crystal Field Theory (CFT), what is the correct electronic configuration and magnetic behavior of the high-spin complex \([Fe(H_2O)_6]^{2+}\)?

• (A) \(t_{2g}^4 e_g^2\), Paramagnetic
• (B) \(t_{2g}^6 e_g^0\), Diamagnetic
• (C) \(t_{2g}^3 e_g^3\), Paramagnetic
• (D) \(t_{2g}^5 e_g^1\), Paramagnetic

Which of the following alkyl halides will undergo the fastest rate of nucleophilic substitution via an \(S_{N}1\) mechanism when treated with an aqueous nucleophile?

• (A) \(CH_3Cl \)
• (B) \((CH_3)_3CCl \)
• (C) \(CH_3CH_2Cl \)
• (D) \((CH_3)_2CHCl \)

When phenol is treated with chloroform (\(CHCl_3\)) in the presence of an aqueous sodium hydroxide solution followed by acidification, a prominent aromatic aldehyde is generated. What is the name of this organic reaction?

• (A) Kolbe's Reaction
• (B) Reimer-Tiemann Reaction
• (C) Rosenmund Reduction
• (D) Friedel-Crafts Acylation