Question

In $[Ni{(N{H_3})_4}]S{O_4}$​, the valency and coordination number of $Ni$ will be respectively
A.3 and 6
B.2 and 4
C.4 and 2
D.4 and 4

Answer 1

Noble gases have a totally filled peripheral shell and that is the reason they are least responsive. Other component's reactivity relies on their capacity to achieve the honorable gas design. Coordination number, additionally called Ligancy, the quantity of particles, particles, or atoms that a focal molecule or particle holds as its closest neighbors in a complex or coordination compound or in a precious stone
The quantity of unidentate ligands (or twofold the quantity of didentate ligands assuming any) connected to the focal metal particle through arranged bonds is known as the coordination number. In $[Ag{(CN)_2}^ -$, $Ag$ is clung to two unidentate ligands so the coordination number is two.

Complete step by step answer:
$[Ni{(N{H_3})_4}]S{O_4}$
In the above molecule let us mark;
$Ni$ as x
${(N{H_3})_4}$ as zero and
$S{O_4}$ as minus two
So, let us now assume that the oxidation state of $Ni$ in $[Ni{(N{H_3})_4}]S{O_4}$ as x
Then, $x = + 2$ will be the valency and four will be the Coordination number of $Ni$ as there are 4 ligands inside the complex.

So, the correct answer to the above question is option B.

Additional Information: The Coordination number of a particle in a given particle or a precious stone alludes to the all-out number of iotas, particle, or particles attached to the molecule being referred to. 'Ligancy' is another term used to allude to the coordination number of a molecule. The iotas, particles, or atoms that are attached to the central atom (or atom/particle) are called ligands. The ligancy of particles is determined distinctively when contrasted with computing the coordination number of a focal molecule in a precious stone. On account of polyatomic particles and atoms, the coordination number relating to a given molecule can be determined by checking the absolute number of iotas it is clung to, be it a solitary bond or a two fold/triple bond.

Note:
The central atom and the ligands which are legitimately connected to it are encased in square sections and are on the whole named as the coordination circle or coordination substance. Particles that are appended non-covalently to the ligands are known as the second coordination circle. A counter particle is the particle that goes with an ionic species to keep up electric impartiality.