What is the reason fo the stability of colloidal sols ?

Given an example each of molecular solid and an ionic solid.

Pb(NO₃)₂ on heating gives a brown gas which undergoes dimerization on cooling ? Identify the gas.

When coordination compound CoCl₃.6NH₃ is mixed with AgNO₃, 3molesof AgCl is precipitated per mole of the compound. write
i) Structural formula of the complex
ii) IUPAC name of the complex

(i) Gas (A) is more soluble in water than Gas (B) at the same temperature which one of two gases will the higher value of K_H (Henry's constant) and why ?

(ii)In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?

Write the structures of the following:
i) BrF₃
ii) XeF₄

Or

What happens when:
i) SO₂ gas is passed through an aqueous solution Fe³⁺ salt ?
ii) XeF₄ reacts with SbF₅ ?

For a reaction: 

rate =k

i) Write the order and molecularity of this reaction.
ii) Write the unit of k.

8.

a) For the complex [Fe(H₂O)₆]³⁺, write the hybridization,magnetic character and spin of the complex.(At.number: Fe=26).

b) Draw one of the geometrical isomers of the complex [Pt(en)₂Cl₂]²⁺ which is optically inactive.

Give reasons:
i) SO₂ is reducing while TeO₂ is an oxidizing agent.
ii) Nitrogen does not form pentahalide.
iii) ICl is more reactive than I₂

Calculate the boiling point of the solution when 4g of MgSO₄ (M =120 g mol^-1) was dissolved in 100g of water,assuming MgSO₄ undergoes complete ionization.

(K_b for water =0.52 K kg mol^-1)