Write the major product(s) in the following reactions:

(a) For the complex [Fe(CO)₅], write the hybridization, magnetic character and spin of the complex. (At. number: Fe = 26)

(b) Define crystal field splitting energy.

Write the role of

(i) I₂ in the van Arkel method of refining.

(ii) Cryolite in the extraction of aluminium.

(iii) Dilute NaCN in the extraction of silver.

Due to hectic and busy schedule, Mr. Awasthi made his life full of tensions and anxiety. He started taking sleeping pills to overcome the depression without consulting the doctor. Mr. Roy, a close friend of Mr. Awasthi, advised him to stop taking sleeping pills and suggested to change his lifestyle by doing Yoga, meditation and some physical exercise. Mr. Awasthi followed his friend’s advice and after few days he started feeling better.

After reading the above passage, answer the following:

(i) What are the values (at least two) displayed by Mr. Roy?

(ii) Why it is not advisable to take sleeping pills without consulting doctor?

(iii) What are tranquilizers? Give two examples.

(a) Calculate ∆G° and log K_c for the following reaction at 298 K:

2Cr(s) + 3Fe²⁺(aq) → 2Cr³⁺(aq) + 3Fe(s)

Given: E°_cell = 0.30 V

(b) Using the E° values of A and B, predict which is better for coating the surface of iron [E° (Fe²⁺|Fe) = –0.44 V] to prevent corrosion and why?

Given: E°(A²⁺|A) = –2.37 V : E°(B²⁺|B) = –0.14 V

OR

(a) The conductivity of 0.001 mol/L solution of CH₃COOH is 3.905 × 10^-5 S/cm. Calculate its molar conductivity and degree of dissociation.

Given: λ° (H⁺) = 349.6 S cm² mol^-1 and λ° (CH₃COO^-) = 40.9 S cm² mol^-1.

(b) What type of battery is lead storage battery? Write the overall reaction occurring in lead storage battery.