In which of the following complex ion, the central metal ion is in a state of sp³d² hybridisation?

• [CoF₆]^3-

• [Co(NH₃)₆]³⁺

• [Fe(CN)₆]^3-

• [Cr(NH₃)₆]³⁺

Which of the following can participate in linkage isomerism?

• NO${}_2^{-}$

• ${\mathrm{H}}_2\stackrel{··}{\mathrm{N}}{\mathrm{CH}}_2{\mathrm{CH}}_2\stackrel{··}{\mathrm{N}}{\mathrm{H}}_2$

• H₂O

• :NH₃

IUPAC name of Na₃[Co(NO₂)₆] is

• sodium hexanitrito cobaltate (II)

• sodium hexanitro cobaltate (III)

• sodium hexanitrito cobaltate (III)

• sodium cobaltnitrite

A complex compound in which the oxidation number of a metal is zero is

• K₄[Fe(CN)₆]

• K₃[Fe(CN)₆]

• [Ni(CO)₄]

• [Pt(NH₃)₄]Cl₂

Which complex cannot ionise in solution?

• [CoCl₃(NH₃)₃]

• K₄[Fe(CN)₆]

• K₂[Pt(F₆)]

• [Pt(NH₃)₆]Cl₄

The IUPAC name of [Co(NH₃)₅ONO]²⁺ ion is

• penta ammine nitrito cobalt (IV) ion

• penta ammine nitrito cobalt (III) ion

• penta ammine nitro cobalt (III) ion

• penta ammine nitro cobalt (IV) ion

The IUPAC name of K₂[Ni(CN)₄] is

• potassium tetracyanonickelate (II)

• potassium tetracyanatonickelate (III)

• potassium tetracyanatonickel (II)

• potassium tetracyanonickel (III)

The IUPAC name of the complex [Co(NH₃)₄Cl₂]Cl is

• dichloro tetraammine cobalt (III) chloride

• tetraammine dichloro cobalt (III) chloride

• tetraammine dichloro cobalt (II) chloride

• tetraammine dichloro cobalt (IV) chloride

139.

Which one of the following is wrongly matched?

• [Cu(NH₃)₄]²⁺  - Square planar

• [Ni(CO)₄]   - Netural ligand

• [Fe(CN₆)^3-]  -  sp³d²

• [Co(en)₃]³⁺    - Follows EAN

The atomic number of cobalt is 27. The EAN of cobalt in Na₃[CoNO₂)₄Cl₂] is

• 24

• 36

• 34

• 35