NEET UG 2011 — Chemistry Inorganic Chemistry

2011mcqmedium

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

Official previous-year question

Held on 30 Apr 2011 · Verified 9 Jul 2026.

Options

A
$\mathrm{O}_2^{-}, \mathrm{O}_2^{2-}$ - Both diamagnetic
B
$\mathrm{O}^{+}, \mathrm{O}_2^{2-}$ - Both paramagnetic
C
$\mathrm{O}_2^{+}, \mathrm{O}_2$ - Both paramagnetic
D
$\mathrm{O}, \mathrm{O}_2^{2-}$ - Both paramagnetic

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Solution

The molecular orbital configurations of $\mathrm{O}_2^{+}, \mathrm{O}_2^{-}, \mathrm{O}_2^{2-}$ and $\mathrm{O}_2$ are $\begin{aligned} & \mathrm{O}_2^{+}=\sigma 1 s^2, \sigma 1 s^2, \sigma 2 s^2, \sigma 2 s^2, \sigma 2 p_z^2, \pi 2 p_x^2 \approx \pi 2 p_y^2, \\ & \pi 2 p_x^1 \approx \pi 2 p_y^0 \\ & \mathrm{O}_2^{-}=\sigma 1 s^2, \sigma \cdot \% 1 s^2, \sigma 2 s^2, \sigma 2 s^2, \sigma 2 p_z^2, \pi 2 p_x^2 \\ & \approx \pi 2 p_y^2, \pi 2 p_x^2 \approx \pi 2 p_y^1 \\ & \mathrm{O}_2^{2-}=\sigma 1 s^2, \sigma \cdot s^2, \sigma 2 s^2, \sigma 2 s^2, \sigma 2 p_z^2, \pi 2 p_x^2 \\ & \approx \pi 2 p_y^2, \pi 2 p_x^2 \approx \pi 2 p_y^2 . \\ & \mathrm{O}_2=\sigma 1 s^2, \sigma 1 s^2, \sigma 2 s^2, \sigma^* 2 s^2, \sigma 2 p_z^2, \pi 2 p_x^2 \\ & \approx \pi 2 p_y^2, \pi 2 p_x^1 \approx \pi 2 p_y^1 \end{aligned}$ And the electronic configuration of $\mathrm{O}$ and $\mathrm{O}^{+}$ are $\begin{array}{r} \mathrm{O}=1 s^2, 2 s^2, 2 p_x^2, 2 p_y^1, 2 p_z^1 \\ \mathrm{O}^{+}=1 s^2, 2 s^2, 2 p_x^1, 2 p_y^1, 2 p_z^1 \end{array}$ As $\mathrm{O}_2^{+}, \mathrm{O}_2, \mathrm{O}_2^{-}, \mathrm{O}$ and $\mathrm{O}^{+}$ have unpaired electrons, hence are paramagnetic.

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NEET UG 2011 — Chemistry Inorganic Chemistry

2011mcqmedium

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

Official previous-year question

Held on 30 Apr 2011 · Verified 9 Jul 2026.

Options

A
$\mathrm{O}_2^{-}, \mathrm{O}_2^{2-}$ - Both diamagnetic
B
$\mathrm{O}^{+}, \mathrm{O}_2^{2-}$ - Both paramagnetic
C
$\mathrm{O}_2^{+}, \mathrm{O}_2$ - Both paramagnetic
D
$\mathrm{O}, \mathrm{O}_2^{2-}$ - Both paramagnetic

Did you get this right?

Solution

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NEET UG Inorganic Chemistry in other years

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NEET UG 2011 — Chemistry Inorganic Chemistry

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Solution

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NEET UG Inorganic Chemistry in other years

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NEET UG 2011 — Chemistry Inorganic Chemistry

Options

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Solution

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NEET UG Inorganic Chemistry in other years

More NEET UG Inorganic Chemistry questions

Other Chemistry topics for NEET UG

Physical Chemistry

Organic Chemistry

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