Class JEE Chemistry ALL Q #1185
KNOWLEDGE BASED
APPLY
4 Marks 2026 JEE Main 2026 (Online) 21st January Morning Shift NUMERICAL
Out of the following, how many compounds have tetrahedral geometry? $NH4^{+}$, $XeF4$, $[NiCl4]^{2-}$, $[PtCl4]^{2-}$, $[Cu(NH3)4]^{2+}$, $BF3$, $[Ni(CO)4]$
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Step-by-Step Solution

Let's analyze each compound:

  1. $NH4^{+}$: Nitrogen has 4 bond pairs and 0 lone pairs. Therefore, it has a tetrahedral geometry.
  2. $XeF4$: Xenon has 4 bond pairs and 2 lone pairs. Therefore, it has a square planar geometry.
  3. $[NiCl4]^{2-}$: Nickel (Ni) is in +2 oxidation state. $Ni^{2+}$ has a $d^8$ configuration. $Cl^{-}$ is a weak field ligand, so it does not cause pairing. Therefore, the hybridization is $sp^3$ and the geometry is tetrahedral.
  4. $[PtCl4]^{2-}$: Platinum (Pt) is in +2 oxidation state. $Pt^{2+}$ has a $d^8$ configuration. Platinum is a strong field ligand, so it causes pairing. Therefore, the hybridization is $dsp^2$ and the geometry is square planar.
  5. $[Cu(NH3)4]^{2+}$: Copper (Cu) is in +2 oxidation state. $Cu^{2+}$ has a $d^9$ configuration. Due to Jahn-Teller distortion, it has a square planar geometry.
  6. $BF3$: Boron has 3 bond pairs and 0 lone pairs. Therefore, it has a trigonal planar geometry.
  7. $[Ni(CO)4]$: Nickel has 4 bond pairs and 0 lone pairs. Therefore, it has a tetrahedral geometry.

Correct Answer: 3

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because it requires the student to apply their knowledge of VSEPR theory and coordination chemistry to predict the geometry of different chemical species.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the underlying concepts of chemical bonding, VSEPR theory, and coordination complexes to determine the geometry of the given compounds. It's not just recall of facts, but application of concepts.
Syllabus Audit: In the context of JEE, this is classified as KNOWLEDGE. The question directly assesses the student's understanding of chemical bonding and molecular structure, which are core topics in the JEE syllabus.

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