Question

1. Complex compound having central metal atom in zero oxidation state.
(A) [Cu(NH3)4]SO4 (B) (Pt(NH3)2Cl2] (C) K4 [Ni(CN)4]
(D) K3[Fe(CN)61​

Answer 1

Answer:

Option C

Explanation:

4K4+ + (Fe(CN)4)-4

Fe =zero

Answer 2

Answer:

The complex K₄ [Ni(CN)₄] have central metal nickel in zero oxidation state.

Explanation:

• [Cu(NH₃)₄]SO₄ complex: oxidation state of Copper in complex ion [Cu(NH₃)₄]²⁺ where ammonia is neutral ligand has charge zero

                    $x+2(0)=+2\\x=+2$

        So the central metal has oxidation stare +2.

• [Pt(NH₃)₂Cl₂] complex: Oxidation state of Pt is:

                     $x+2(0)+2(-1)=0\\x=+2$

        Platinum is present in +2 oxidation state.        

• K₄ [Ni(CN)₄] complex: Oxidation state of nickel metal in complex ion  [Ni(CN)₄]⁴⁻ is:  

                      $x+4(-1)=-4\\x=4-4\\x=0$

        Central metal Ni is present in zero oxidation state in complex.

• K₃[Fe(CN)₆] complex: Oxidation state of iron in ​[Fe(CN)₆]³⁻ complex ion is:

                      $x+6(-1)=-3\\x=6-3\\x=+3$

       Central metal atom is present as Fe³⁺.