CBSE 12 Chemistry Question Paper-2025 Set-2

In a galvanic cell, the reaction is: 2Cu⁺(aq) + Zn(s) → 2Cu(s) + Zn²⁺(aq) $E_{cell}$⁰ = 1.28 V. What happens to the overall cell potential as the reaction proceeds?

Which one of the following compounds will have the highest boiling point?

The major product formed in the following reaction is:

The number of unpaired electrons in a free Fe³⁺ ion is:

The number of electrons, protons and neutrons in an atom of the element 'Y' with atomic number 89 and mass number 231 are respectively:

A compound with formula C₄H₁₁N gives a secondary amine on reaction with nitrous acid (HNO₂). The compound is:

The correct order of increasing acidic strength of the following compounds is:

Which one of the following is a non-reducing sugar?

The reaction of phenol with chloroform in the presence of dilute sodium hydroxide to form salicylaldehyde is known as:

The reagent used for the conversion of a primary amide to a primary amine with one carbon atom less is:

The reagent used for the conversion of an alkyl halide to a primary amine is:

Which of the following compounds has the lowest boiling point?

The number of atoms in a body-centered cubic unit cell is:

Which of the following is a tertiary alkyl halide?

Which of the following does not give a positive Tollens' test?

Assertion (A): On adding a non-volatile solute to a solvent, the vapour pressure of the solution decreases. Reason (R): The presence of a non-volatile solute increases the number of particles that escape into the vapour phase, thereby decreasing the vapour pressure of the solution.

Assertion (A): An atom cannot have a charge. Reason (R): A neutral atom contains an equal number of protons and electrons.

A student prepared 0.5 M solution of a solute in water. The boiling point of the solution was 100.26 °C. The molal elevation constant (Kₑ) for water is 0.52 K kg mol⁻¹. The student concluded that the solute is:

A solution of urea (Molar mass 60 g mol⁻¹) is prepared by dissolving 12 g of urea in 1 kg of water. The boiling point of the solution is: (Kₑ for water = 0.52 K kg mol⁻¹)

On warming with dilute HNO₃, the compound which gives a yellow precipitate is:

What happens to the rate of a reaction when the concentration of the reactant is doubled and the reaction is of the first order?

Which of the following compounds will give a positive Iodoform test?

The major product of the following reaction is:

Which of the following will have the highest molar conductivity?

The total number of geometrical isomers of the complex [Co(en)₂(Cl)₂]⁺ is:

The rate of a first-order reaction is 0.04 mol L⁻¹ s⁻¹ at 10 minutes and 0.02 mol L⁻¹ s⁻¹ at 20 minutes. The half-life of the reaction is:

Which of the following will have the highest molar conductivity?

An example of a polysaccharide is:

In association, the abnormal molar mass of the solute:

An example of a molecule with a central atom having no lone pair of electrons is:

Which of the following does not exist?

The coordination number of copper in [Cu(NH₃)₄]SO₄ is:

The reagent used for the conversion of an alkyl halide to a primary amine is:

The pH of 10⁻¹⁰ M NaOH solution is:

The change in Gibbs energy (ΔG) for a reaction is given by:

The order of reactivity of alkyl halides in Sₙ1 reaction is: