Question

Question No. 23
• Which among the following
species is the most paramagnetic in
nature?
Answer
Cr (4+)
B. Cr (3+)
Cr (2+)
D. Cr(+1)
ن م ه
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Answer 1

Answer:

Cr (3+)

Explanation:

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Answer 2

The most paramagnetic species among the following is cr(+1)

• Paramagnetism is measured in terms of unpaired electrons .
• More the number of electrons more the paramagnetism.
• Here, in chromium the outermost configuration is 4s¹ and 3d⁵.
• This is an exceptional case as in order to maintain stability and for hight exchange energy one electron in 4s subshell is transfered to 3d.
• So, if we excite the chromium atom in +1 state then 5 electrons in d subshell remains. Which is high for as compared to 2 in +4 state 3 in +3 state and 4 in +2 state.

Hence, the most paramagnetic species is Cr(+4)