alleryHow many unpaired electrons does an O2 molecule have?
- 4
- 2
- 1
- 0
Show answer and solution
Correct answer: B. 2
One electron sits in each of the π*2px and π*2py orbitals, so O2 has two unpaired electrons and is paramagnetic.
NEET UG Chemical Bonding and Molecular Structure — practice questions — page 5
Explore 126 free Chemical Bonding and Molecular Structure questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 121–126 of 126.
How many unpaired electrons does an O2 molecule have?Read the answer and worked solution →Hydrogen bonding is strongest when hydrogen is bonded to which atoms?Read the answer and worked solution →Which common cation in ionic compounds is not derived from a metal?Read the answer and worked solution →The octet rule applies mainly to elements of which period?Read the answer and worked solution →Which is a known drawback of the octet theory of bonding?Read the answer and worked solution →Which molecule breaks the octet rule by having an odd number of electrons?Read the answer and worked solution →
Worked practice questions
Hydrogen bonding is strongest when hydrogen is bonded to which atoms?
- C, Si and Ge
- N, O and F
- B, Al and Ga
- Cl, Br and I
Show answer and solution
Correct answer: B. N, O and F
Nitrogen, oxygen and fluorine are highly electronegative, pulling bond electrons away from hydrogen so it can bridge to another molecule.
Which common cation in ionic compounds is not derived from a metal?
- Ammonium, NH₄⁺
- Calcium, Ca²⁺
- Sodium, Na⁺
- Potassium, K⁺
Show answer and solution
Correct answer: A. Ammonium, NH₄⁺
Cations usually come from metals, but the ammonium ion is built from nitrogen and hydrogen, both non-metals.
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