The correct order of energies of molecular orbitals of N2 molecule is:
1. \( \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\)
\(\sigma^* 2 s<\left(\pi 2 p_x=\pi 2 p_y\right)<\)
\(\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma 2 p_z<\sigma^* 2 p_z\)
2. \( \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\sigma^* 2 s<\)
\(\left(\pi 2 p_x=\pi 2 p_y\right)< \)
\(\sigma 2 p_z<\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma^* 2 p_z \)
3. \( \sigma \text { 1s }<\sigma^* \text { 1s }<\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z<\)
\( \left(\pi 2 p_x=\pi 2 p_y\right)<\)
\(\left(\pi^* 2 p_x=\pi^* 2 p_y\right)<\sigma^* 2 p_z \)
4. \( \sigma \text { 1s }<\sigma^* \text { 1s }\)
\(<\sigma 2 s<\sigma^* 2 s<\sigma 2 p_z< \)
\( \sigma^* 2 p_z<\left(\pi 2 p_x=\pi 2 p_y\right)<\)
\(\left(\pi^* 2 p_x=\pi^* 2 p_y\right) \)
Subtopic:  M.O.T |
 67%
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NEET - 2023
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Amongst the following, the total number of species NOT having eight electrons around the central atom in its outermost shell, is: 
\(\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 \)
1. 1 2. 3
3. 2 4. 4
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
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NEET - 2023
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The correct order of dipole moments for molecules \(NH_3, H_2S , CH_4 \) and \(HF\) is : 
1. \(\mathrm{CH}_4>\mathrm{H}_2 \mathrm{~S}>\mathrm{NH}_3>\mathrm{HF} \)
2. \(\mathrm{H}_2 \mathrm{~S}>\mathrm{NH}_3>\mathrm{HF}>\mathrm{CH}_4 \)
3. \(\mathrm{NH}_3>\mathrm{HF}>\mathrm{CH}_4>\mathrm{H}_2 \mathrm{~S} \)
4. \(\mathrm{HF}>\mathrm{NH}_3>\mathrm{H}_2 \mathrm{~S}>\mathrm{CH}_4\)
Subtopic:  Polarity |
 62%
From NCERT
NEET - 2023
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Which one of the following represents all isoelectronic species? 
1. \(Na^+ , Cl^-, O^- , NO^+\)
2. \(N_2O, N_2O_4 , NO^+, NO\)
3. \(Na^+ , Mg^{2+} , O^- , F^-\)
4. \(Ca^{2+} , Ar, K^+, Cl^-\)
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 73%
From NCERT
NEET - 2023
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Which one of the following statements is incorrect related to Molecular Orbital Theory? 
1. The \(\pi^*\) antibonding molecular orbital has a node between the nuclei. 
2. In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.
3. Molecular orbitals obtained from \(2P_x\) and \(2P_y\) orbitals are symmetrical around the bond axis. 
4. \(\pi-\)bonding molecular orbital has larger electron density above and below the internuclear axis.

 
Subtopic:  M.O.T |
From NCERT
NEET - 2023
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Which among the following is an incorrect statement?
 
1.  \(O^+_2\) ion is diamagnetic.
2. The bond orders of \(O_2^{+},O_2,O^-_2\) and \(O_2^{2-}\) are 2.5, 2, 1.5, and 1, respectively.
3.  \(C_2\) molecule has four electrons in its two degenerate \(\pi \) molecular orbitals.
4.  \(H^+_2 \) ion has one electron.
Subtopic:  M.O.T |
 75%
From NCERT
NEET - 2022
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Amongst the following, which one will have maximum 'lone pair - lone pair' electron repulsions? 

1. \(XeF_2\)
2. \(CIF_3\)
3. \(IF_5\)
4. \(SF_4\)
Subtopic:  V.S.E.P.R & V.B.T |
 72%
From NCERT
NEET - 2022
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Which one of the following statements is true about the structure of \(CO^{2-}_3\) ion?

1. It can be explained by considering sp3 hybridization.
2. Out of the three C–O bonds, two are longer and one is shorter.
3. It has three Sigma and three \(\pi\)-bonds.
4. All three C–O bonds are equal in length with a bond order in between 1 and 2.
Subtopic:  Resonance & Nature of Compounds |
 53%
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NEET - 2022
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Which one of the following is the correct order of decreasing bond enthalpies for the given species?

1.  \(O^{2-}_2>O^-_2>O_2>N_2 \)
2.  \(N_2>O_2>O^{2-}_2>O^-_2 \)
3.  \(N_2>O_2>O^-_2>O^{2-}_2 \)
4.  \(O_2>N_2>O^-_2>O^{2-}_2 \)

Subtopic:  M.O.T |
 70%
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The correct order of bond angles in the following compounds/species is:

1.  \(\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_3<\mathrm{NH}_4^{+}<\mathrm{CO}_2 \)
2.  \(\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+}<\mathrm{NH}_3<\mathrm{CO}_2 \)
3.  \(\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+}=\mathrm{NH}_3<\mathrm{CO}_2 \)
4.  \(\mathrm{CO}_2<\mathrm{NH}_3<\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+} \)
Subtopic:  V.S.E.P.R & V.B.T |
 64%
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NEET - 2022
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