ICSE Class 12 Chemistry — Important Questions (Board Exams 2027)

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.

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:

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: