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Q. No.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 |
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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:
\(\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 \)
\(\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 \)
| 1. | 1 | 2. | 3 |
| 3. | 2 | 4. | 4 |
Subtopic: Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
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From NCERT
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 |
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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. \(Ca^{2+} , Ar, K^+, Cl^-\)
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 |
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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. | A \(\pi-\)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 |
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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. \(SF_4\)
1. \(XeF_2\)
2. \(CIF_3\)
3. \(IF_5\)
4. \(SF_4\)
Subtopic: V.S.E.P.R & V.B.T |
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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 |
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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 |
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From NCERT
NEET - 2022
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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. \(\mathrm{CO}_2<\mathrm{NH}_3<\mathrm{H}_2 \mathrm{O}<\mathrm{NH}_4^{+} \)
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 |
65%
From NCERT
NEET - 2022
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