Question

Among [Co(CN)₄]⁴⁻, [Co(CO)₃(NO)], XeF₄, [PCl₄ ]⁺, [PdCl₄ ]²⁻ , [ICl₄ ]⁻ , [Cu(CN)₄]³⁻ and P₄ the total number of species with tetrahedral geometry is _____.

Answer 1

Correct Answer: 3

Analysis of Tetrahedral Geometry in Compounds

Step 1: Analyze Each Compound to Identify Tetrahedral Geometry

1. [Co(CN)₄]⁴⁻: CN is a strong ligand. Due to pairing, it undergoes sp³ hybridization, forming a tetrahedral structure.
2. [Co(CO)₃(NO)]: This forms a trigonal planar geometry due to the coordination environment.
3. XeF₄: Square planar geometry, not tetrahedral.
4. [PCl₄]⁺: Tetrahedral geometry due to sp³ hybridization.
5. [PdCl₄]²⁻: Square planar geometry.
6. [ICl₄]⁻: Square planar geometry.
7. [Cu(CN)₄]³⁻: CN being a strong ligand leads to sp³ hybridization, hence tetrahedral.
8. P₄: Tetrahedral geometry due to its molecular structure.

Step 2: Count the Species with Tetrahedral Geometry

Tetrahedral species: [Co(CN)₄]⁴⁻, [PCl₄]⁺, [Cu(CN)₄]³⁻, and P₄.

Step 3: Final Answer

The total number of tetrahedral species is 3.

Answer 2

To solve the problem, we need to determine the geometry of each species listed and count how many have tetrahedral geometry.

1. Analyze each species:

• [Co(CN)₄]⁴⁻: Coordination number 4, CN⁻ is a strong field ligand, usually leads to square planar or tetrahedral geometry for Co complexes.
  Co is typically in +2 or +3 state here, but with CN⁻ (strong field), [Co(CN)₄]⁴⁻ is known to have square planar geometry.
• [Co(CO)₃(NO)]: Coordination number 4, CO and NO are strong field ligands, tends to be square planar.
• XeF₄: Xenon tetrafluoride has 4 bonded atoms and 2 lone pairs, molecular shape is square planar.
• [PCl₄]⁺: Phosphorus with 4 Cl ligands, no lone pairs, typical geometry is tetrahedral.
• [PdCl₄]²⁻: Pd(II) complexes with coordination number 4 and usually square planar geometry.
• [ICl₄]⁻: Iodine with 4 Cl ligands and 2 lone pairs, molecular geometry is square planar.
• [Cu(CN)₄]³⁻: Copper(I) with 4 CN ligands, coordination number 4, usually tetrahedral geometry.
• P₄: Elemental phosphorus molecule is tetrahedral.

2. Count species with tetrahedral geometry:
- [PCl₄]⁺
- [Cu(CN)₄]³⁻
- P₄

Total = 3 species.

Final Answer:
The total number of species with tetrahedral geometry is \(\boxed{3}\).