Which of the following is paramagnetic?

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) Paramagnetism is the property of a substance that contains one or more unpaired electrons.$1.$ $NO^{+}$: Total electrons = $7 + 8 - 1 = 14$. Molec

Vedclass · Accepted Answer

$O_2^-$

Vedclass · Answer

(C) Paramagnetism is the property of a substance that contains one or more unpaired electrons.$1.$ $NO^{+}$: Total electrons = $7 + 8 - 1 = 14$. Molecular orbital configuration: $(\sigma 1s)^2, (\sigma^* 1s)^2, (\sigma 2s)^2, (\sigma^* 2s)^2, (\sigma 2p_z)^2, (\pi 2p_x)^2, (\pi 2p_y)^2$. All electrons are paired,so it is diamagnetic.$2.$ $CO$: Total electrons = $6 + 8 = 14$. Similar to $NO^{+}$,all electrons are paired,so it is diamagnetic.$3.$ $O_2^-$: Total electrons = $8 + 8 + 1 = 17$. Molecular orbital configuration: $(\sigma 1s)^2, (\sigma^* 1s)^2, (\sigma 2s)^2, (\sigma^* 2s)^2, (\sigma 2p_z)^2, (\pi 2p_x)^2, (\pi 2p_y)^2, (\pi^* 2p_x)^2, (\pi^* 2p_y)^1$. It contains one unpaired electron in the $\pi^* 2p_y$ orbital,making it paramagnetic.$4.$ $CN^{-}$: Total electrons = $6 + 7 + 1 = 14$. Similar to $CO$,all electrons are paired,so it is diamagnetic.

Similar Questions

One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of $27\,^{\circ}C$. If the work done during the process is $3\,kJ$,then the final temperature of the gas is ......$K$ $(C_V = 20\,J/K)$.

Five moles of hydrogen initially at $STP$ is compressed adiabatically so that its temperature becomes $673 \, K$. The increase in internal energy of the gas, in kilo joule is $(R=8.3 \, J/mol-K; \gamma=1.4$ for diatomic gas$)$

The major product of the following reaction is

Two rain drops reach the earth with different terminal velocities having ratio $9:4$. Then the ratio of their volumes is

The mass of a spaceship is $1000\,kg$. It is to be launched from the earth's surface out into free space. The values of $g$ and $R$ (radius of earth) are $10\,m/s^2$ and $6400\,km$ respectively. The required energy for this work will be:

Vedclass Test Series

Exam Paper Generator

Online Exam Module