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Chemical Bonding and Molecular Structure — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What do the dots in a Lewis symbol for an isolated atom represent?
  1. Valence-shell electrons ✓
  2. All electrons in the atom
  3. Only unpaired electrons
  4. Protons in the nucleus
Answer: A. A Lewis symbol displays the atom's valence electrons around its element symbol. Those electrons determine common bonding and valence; protected core electrons are not drawn.
Why not B: Inner electrons belong to the kernel and are omitted from a Lewis symbol.
Why not C: Paired valence electrons are also shown as dots, so the symbol is not restricted to unpaired electrons.
Why not D: Lewis dots track electrons involved in bonding, not nuclear particles.
In one canonical Lewis structure of O3, what formal charge is assigned to the central oxygen?
  1. -1
  2. 0
  3. +1 ✓
  4. +2
Answer: C. For central O, formal charge = 6 − 2 nonbonding electrons − 3 assigned bonding electrons = +1. The terminal single-bonded oxygen balances it with −1.
Why not A: The singly bonded terminal oxygen, not the central atom, carries −1 in that contributor.
Why not B: The double-bonded terminal oxygen has formal charge zero.
Why not D: Counting both bonds as fully owned by the central atom rather than half-shared produces an excessive charge.
What feature of the molecular-orbital configuration explains oxygen's paramagnetism?
  1. Two unpaired electrons occupy separate degenerate π*2p orbitals ✓
  2. A lone pair remains on each oxygen atom in localised orbitals
  3. The σ2p bonding orbital contains only one electron
  4. Both π2p bonding orbitals are half-filled
Answer: A. After filling the bonding orbitals, O2 places its last two electrons singly in degenerate π*2p orbitals by Hund's rule. Those two unpaired electrons make O2 paramagnetic.
Why not B: Lewis lone pairs are paired and cannot explain attraction to a magnetic field.
Why not C: The σ2p bonding MO is filled in O2 under the standard ordering.
Why not D: The bonding π orbitals are filled; the unpaired electrons occupy antibonding π* orbitals.

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Every NCERT question in this chapter is solved, free: NCERT solutions — Chemical Bonding and Molecular Structure →

Other NEET Chemistry chapters

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Questions

How many NEET questions are there on Chemical Bonding and Molecular Structure?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.