Chemical Bonding | First Year Chemistry Past Paper MCQs | mosaicbro.com

Chemical Bonding | First Year Chemistry Past Paper MCQs

7 of 41 questions (Page 4 of 6)

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22 The number of electrons shared in SF₆:
Correct Answer: B
Explanation: SF₆ uses 12 shared electrons (6 S-F single bonds).
23 Which molecule has zero dipole moment?
Correct Answer: C
Explanation: BF₃ is trigonal planar and symmetrical (μ = 0).
24 The bond angle in H₂O molecule is:
Correct Answer: D
Explanation: H₂O has bent geometry with ~104.5° due to lone pair repulsion.
25 Which of the following is paramagnetic?
Correct Answer: B
Explanation: O₂ has 2 unpaired electrons in π* orbitals (paramagnetic).
26 The bond angle in NH₃ is:
Correct Answer: A
Explanation: NH₃ has pyramidal geometry with ~107.5° bond angles (less than tetrahedral due to lone pair).
27 The shape of PCl₅ molecule is:
Correct Answer: B
Explanation: PCl₅ adopts trigonal bipyramidal geometry (sp³d hybridization).
28 Which of the following has the highest bond energy?
Correct Answer: B
Explanation: N₂ has a triple bond with very high bond energy (945 kJ/mol).
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