ICSE Class 12 Chemistry — Important Questions 2026

ppm (parts per million) is used to express the concentration of very dilute solutions like pollutants in the environment.

The relative lowering of vapour pressure of a solution is equal to:

Ideal solutions obey Raoult's law at all concentrations and temperatures.

When a non-volatile solute is dissolved in a solvent, the boiling point of the solution:

Which of the following is a rechargeable battery?

In a galvanic cell, the cathode is the negative electrode.

The standard EMF of a Daniell cell (Zn-Cu) is:

What does the salt bridge in a galvanic cell do?

For the reaction N₂ + 3H₂ → 2NH₃, if rate of disappearance of N₂ is 2 × 10⁻⁴ mol L⁻¹ s⁻¹, the rate of disappearance of H₂ is:

The rate constant k of a reaction increases with increasing concentration of reactants.

For the reaction A + 2B → 3C + 2D with Rate = k[A][B]², the overall order of reaction is:

The half-life of a first-order reaction with rate constant k = 6.93 × 10⁻² s⁻¹ is: