NEET Chemistry: VSEPR theory Practice Questions
11 free multiple-choice questions on VSEPR theory (Chemical Bonding and Molecular Structure) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. What is the predicted molecular geometry for the PCl₅ molecule based on VSEPR theory?
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Correct answer: A — Trigonal bipyramidal
In PCl₅, the central phosphorus atom has 5 bonding pairs (to Cl atoms) and 0 lone pairs. According to VSEPR theory, the arrangement of these 5 electron domains results in a trigonal bipyramidal molecular geometry.
Q2. The molecular geometry of PCl₅ is:
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Correct answer: D — Trigonal Bipyramidal
In PCl₅, the central phosphorus atom has 5 electron domains (5 bonding pairs and 0 lone pairs). This corresponds to a Trigonal Bipyramidal electron geometry, and the molecular geometry is Trigonal Bipyramidal.
Q3. What is the arrangement of electron domains around the central atom in the molecule PCl₅?
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Correct answer: C — Trigonal Bipyramidal
In PCl₅, the central Phosphorus atom has 5 bonding domains and 0 lone pairs (AX₅). This arrangement corresponds to a Trigonal Bipyramidal electron domain geometry.
Q4. Which of the following species has a trigonal bipyramidal electron geometry?
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Correct answer: B — ClF₃
ClF₃ has 5 electron domains (3 bonding pairs, 2 lone pairs), resulting in a trigonal bipyramidal electron geometry. BeCl₄ is tetrahedral, SF₆ is octahedral, and NH₃ is trigonal pyramidal.
Q5. The molecule SF₄ has how many lone pairs on the central sulfur atom, and what is its resulting molecular shape?
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Correct answer: C — 1 lone pair, Seesaw
Sulfur tetrafluoride (SF₄) has 4 bonding pairs and 1 lone pair on the central sulfur atom, resulting in 5 electron domains. This arrangement gives it a Seesaw molecular shape.
Q6. Which of the following molecules has a trigonal pyramidal geometry?
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Correct answer: B — Trigonal Pyramidal
The molecule NH₃ has three bonding pairs and one lone pair on the central nitrogen atom, resulting in a trigonal pyramidal shape.
Q7. The bond angle in the H₂S molecule is approximately 92°. This deviation from the ideal tetrahedral angle is primarily due to the presence of:
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Correct answer: D — Lone pair repulsion
The actual bond angle in H₂S is less than the ideal tetrahedral angle (109.5°) because the two lone pairs on the central sulfur atom exert greater repulsive force than the bonding pairs.
Q8. What is the molecular geometry of the PCl₅ molecule?
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Correct answer: B — Trigonal Bipyramidal
Phosphorus pentachloride (PCl₅) has 5 electron domains (5 bonding pairs and 0 lone pairs), resulting in a Trigonal Bipyramidal electron pair geometry, and the molecular shape is Trigonal Bipyramidal.
Q9. Which of the following best represents the molecular geometry of the ClF₃ molecule, based on VSEPR theory?
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Correct answer: B — T-shaped
In ClF₃, the central Chlorine atom has 5 valence electrons. It forms 3 bonding pairs and has 2 lone pairs (3 bonding pairs + 2 lone pairs = 5 electron domains). The electron geometry is Trigonal Bipyramidal, but due to lone pair repulsion, the molecular shape adopted is T-shaped.
Q10. Which statement correctly describes the relationship between electron geometry and molecular geometry?
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Correct answer: C — Electron geometry describes the arrangement of all electrons, whereas molecular geometry describes the arrangement of only the atoms involved.
Electron geometry is determined by the total number of electron domains (bonding pairs + lone pairs), while molecular geometry describes the arrangement of only the atoms (ignoring lone pairs).
Q11. Which isomer of SF₄ has a seesaw shape?
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Correct answer: D — Seesaw
The SF₄ molecule has 4 bonding pairs and 1 lone pair (AX₄E₁). This configuration leads to a seesaw molecular shape.
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