[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers : Mn = 25; Fe = 26)

A. [FeF₆]^3$$-$$

B. [Fe(CN)₆]^3$$-$$

C. [MnCl₆]^3$$-$$ (high spin)

D. [Mn(CN)₆]^3$$-$$

Choose the correct answer from the options given below :

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrite gives A and B while its reaction with its reaction with HCl produces B and C. A, B and C are, respectively :

Which of the following is most stable?