CBSE 12 Chemistry Question Paper-2025 Set-1

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:

Which of the following compounds has the lowest boiling point?

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

The formula of sodium hexanitritocobaltate(III) is:

The geometry of the complex [Ni(CN)4]²⁻ is:

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

Assertion (A): The melting point of isobutyl alcohol is higher than that of n-butyl alcohol. Reason (R): The branching in isobutyl alcohol makes it more compact, which leads to a more efficient packing in the crystal lattice.

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.

The major product formed in the following reaction is:

The compound which undergoes a nucleophilic substitution reaction most readily is:

The total number of geometrical isomers of the complex [Co(en)2Cl2]⁺ is:

Which of the following does not exist?

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:

The major product formed in the following reaction is:

The compound which undergoes a nucleophilic substitution reaction most readily is:

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

Which of the following does not exist?

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: