On the basis of crystal field theory, write the electronic configuration for d4 ion if ∆o < P ?

Write the hybridization and magnetic behaviour of the complex [Ni(CO)₄].

(At.no. of Ni = 28)

Calculate emf of the following cell at 25 °C:

 Fe | Fe²⁺(0.001 M) || H⁺ (0.01 M) | H₂ (g) (1 bar) | Pt(s)

 E°(Fe²⁺ | Fe) = –0.44 V E°(H⁺ | H₂ ) = 0.00 V

Give reasons for the following observations:

Leather gets hardened after tanning

Give reasons for the following observations:

Lyophilic sol is more stable than a lyophobic sol.

Give reasons for the following observations:

It is necessary to remove CO when ammonia is prepared by Haber's process.

17.

3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).

(Given: Molar mass of benzoic acid = 122 g mol^-1, K_f for benzene = 4.9 K kg mol^-1

Indicate the principle behind the method used for the refining of zinc.

What is the role of silica in the extraction of copper?

Which form of the iron is the purest form of commercial iron?