Question

Observe the following compounds/ions: \[ H_3BO_3, \, [B(OH)_4]^-, \, BH_4^-, \, [BCI_3 \cdot NH_3], \, SiO_4^{2-} \] The number of compounds/ions with tetrahedral shape is:

• A. 5
• B. 4
• C. 2
• D. 3

Hint:

- A tetrahedral structure is formed when an atom is surrounded by four other atoms or groups arranged at the vertices of a tetrahedron. - Look for molecules/ions where the central atom is bonded to four substituents or ligands.

Answer 1

The Correct Option is B

{Step 1:} Analyzing the tetrahedral structure of each compound: 

\( H_3BO_3 \): 

This molecule has a trigonal planar structure, not tetrahedral. 

\( [B(OH)_4]^- \): 

The structure of this ion is tetrahedral, as boron is surrounded by four OH groups in a tetrahedral arrangement. 

 \( BH_4^- \):

This molecule also has a tetrahedral structure, as boron is surrounded by four hydrogen atoms in a tetrahedral shape. 

\( [BCI_3 \cdot NH_3] \):

 The boron atom in this compound is surrounded by three chlorine atoms and one ammonia molecule, resulting in a tetrahedral geometry. 

 \( SiO_4^{2-}\): 

The silicate ion has a tetrahedral shape as the silicon atom is surrounded by four oxygen atoms in a tetrahedral arrangement.Thus, the number of compounds/ions with tetrahedral shape is four.