Given below are two statements:
Statement (I): Dimethyl glyoxime forms a six membered covalent chelate when treated with $$NiCl_2$$ solution in presence of $$NH_4OH$$.
Statement (II): Prussian blue precipitate contains iron both in +2 and +3 oxidation states.
In the light of the above statements, choose the most appropriate answer from the options given below:

We evaluate two statements about coordination compounds.

Statement I: Dimethyl glyoxime (DMG) forms a six-membered covalent chelate when treated with $$NiCl_2$$ in the presence of $$NH_4OH$$.

Analysis: When DMG reacts with $$Ni^{2+}$$, it forms a bis(dimethylglyoximato)nickel(II) complex. Each DMG molecule coordinates through two nitrogen atoms to the nickel ion, forming a five-membered chelate ring:

$$Ni - N = C - C = N$$ (five atoms in the ring: Ni, N, C, C, N)

The statement says six-membered, which is incorrect. Statement I is FALSE.

Statement II: Prussian blue precipitate contains iron both in +2 and +3 oxidation states.

Analysis: Prussian blue has the formula $$Fe_4[Fe(CN)_6]_3$$ (or $$KFe[Fe(CN)_6]$$). It contains:

• $$Fe^{3+}$$ ions in the lattice positions
• $$Fe^{2+}$$ ions inside the hexacyanoferrate(II) complex $$[Fe(CN)_6]^{4-}$$

So yes, iron is present in both +2 and +3 oxidation states. Statement II is TRUE.

Since Statement I is false and Statement II is true, the correct answer is Option A: Statement I is false but Statement II is true.