Science (English Medium) Class 12 - CBSE Important Questions for Chemistry

Write a method by which lyophobic colloids can be coagulated.

Write a method by which lyophobic colloids can be coagulated.

Give reasons for the following observations:

Physisorption decreases with increase in temperature.

Give reasons for the following observations: Addition of alum purifies the water

Give reasons for the following observations:

Brownian movement provides stability to the colloidal solution.

On the basis of crystal field theory, write the electronic configuration for d⁴ ion if Δ₀ > P.

What is the effect of temperature on chemisorption ?

Why is adsorption always exothermic?

Explain what is observed when an electric current is passed through a colloidal sol?

Explain [Co(NH₃)₆]³⁺ is an inner orbital complex, whereas [Ni(NH₃)₆]²⁺ is an outer orbital complex.

[At. No.: Co = 27, Ni = 28]

What is meant by unidentate ligand?

What happens when PCl₅ is heated? Write the equations involved.

Write one difference between Multimolecular colloid and Macromolecular colloid

Write one difference between Multimolecular colloid and Macromolecular colloid

Write one difference between Sol and Gel

Write one difference between Sol and Gel

Write one difference between O/W emulsion and W/O emulsion

Write one difference between O/W emulsion and W/O emulsion

What type of isomerism is shown by the complex [Co(en)₃]Cl₃

Write the hybridisation and magnetic character of [Co(C₂O₄)₃]^3–.

(At. no. of Co = 27)