Chemical Bonding And Molecular Structure Question 162
Which of the following molecules is paramagnetic [CPMT 1980; RPET 1999;MP PMT 1999; RPMT 2000]
Options:
A) Chlorine is a chemical element with the symbol Cl and atomic number 17. It is a yellow-green gas at room temperature and is widely used in water purification, disinfection, and the production of plastics.
B) Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless, and tasteless gas that makes up about 78% of Earth’s atmosphere. Nitrogen is essential for life and is a key component of proteins and nucleic acids. It exists in various forms, including diatomic molecules (Nā), and is used in fertilizers, explosives, and medical applications.
C) Oxygen
D) Hydrogen
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Answer:
Correct Answer: C
Solution:
Oxygen is paramagnetic due to the presence of two unpaired electrons: $ O_2=\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}} $
$ \sigma {{(2p_{x})}^{2}}\pi {{(2p_{y})}^{2}}\pi {{(2p_{x})}^{2}}{{\pi }^{*}}{{(2p_{y})}^{1}}{{\pi }^{*}}{{(2p_{z})}^{1}} $
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