Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.

(Atomic numbers Ce = 58, Gd = 64 and Eu = 63)

(a) (NH₄)₂[Ce(NO₃)₆]

(b) Gd(NO₃)₃ and

(c) Eu(NO₃)₃

Identify the reagent(s) 'A' and condition(s) for the reaction

Statement I : Sodium hydride can be used as an oxidising agent.

Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic.

Choose the CORRECT answer from the options given below :

[Ti(H₂O)₆]³⁺ absorbs light of wavelength 498 nm during a d $$-$$ d transition. The octahedral splitting energy for the above complex is ____________ $$\times$$ 10^$$-$$19 J. (Round off to the Nearest Integer). h = 6.626 $$\times$$ 10^$$-$$34 Js; c = 3 $$\times$$ 10⁸ ms^$$-$$1