Mn₂(CO)₁₀ is an organometallic compound due to the presence of?
Mn–C bond correct as per chemistry principle.
Ref: NCERT Chemistry Class XI and XII
#chemical bonding
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What is the bond order of Oâ‚‚^- according to molecular orbital theory?
For O₂^- : 17 electrons, configuration ends with (π^* 2p_x)² (π^* 2p_y)¹ . Bonding electrons = 10, antibonding = 7. Bond order = 1/2 (10 - 7) = 1.5 .
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.
Which of the following elements is most likely to exhibit covalent character in its compounds?
Beryllium (Be), due to its small size and high charge density, forms compounds with significant covalent character (e.g., BeCl_2). This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.
What is the geometry of the nitrogen atom in CH₃NH₃+ ?
In CH₃NH₃+, the conjugate acid of methylamine, nitrogen has four bonds (three to H, one to C) and no lone pair, resulting in a tetrahedral geometry.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.
Which of the following has the highest number of π bonds?
CH₂=CH-C≡CH has 3 π bonds: 1 from CH₂=CH, 2 from C≡CH, more than the others.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism
Which molecule contains a coordinate bond where nitrogen donates a lone pair to boron?
In H₃NBF₃ , nitrogen in NH₃ donates a lone pair to boron in BF₃ , forming a coordinate bond.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2
Which of the following does not exist due to a bond order of zero?
For He₂ : (sigma 1s)² (sigma^* 1s)² . Bonding = 2, antibonding = 2. Bond order = (2 - 2/2) = 0 , so it does not exist.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2
Which molecule has the highest bond enthalpy?
N₂ has a triple bond with a bond enthalpy of ~946 kJ/mol, higher than O₂ (498 kJ/mol), F₂ (159 kJ/mol), or Cl₂ (243 kJ/mol).
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2
Which molecule contains a double bond and has a bond length of approximately 123 pm?
In CO₂ , each C=O double bond has a bond length of ~123 pm, shorter than C=C in ethene (134 pm) due to higher bond strength.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2
Which molecule has a bond order of 1 and is paramagnetic?
For B₂ : (sigma 1s)² (sigma^* 1s)² (sigma 2s)² (sigma^* 2s)² (pi 2px)¹ (pi 2py)¹ . Bonding = 6, antibonding = 4. Bond order = (6 - 4/2) = 1 , with 2 unpaired electrons (paramagnetic).
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Molecular Orbital Theory - MOT and Bond Order and Magnetic Properties
Which species is diamagnetic and has a bond order of 1?
For H₂ : (sigma 1s)² . Bonding = 2, antibonding = 0. Bond order = (2 - 0/2) = 1 , with all electrons paired (diamagnetic).
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Molecular Orbital Theory - MOT and Bond Order and Magnetic Properties
Which species has a bond order of 2.5 and is paramagnetic?
For NO : (sigma 1s)² (sigma^* 1s)² (sigma 2s)² (sigma^* 2s)² (sigma 2pz)² (pi 2px)² (pi 2py)² (pi^* 2px)¹ . Bonding = 10, antibonding = 5. Bond order = (10 - 5/2) = 2.5 , with 1 unpaired electron (paramagnetic).
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Molecular Orbital Theory - MOT and Bond Order and Magnetic Properties
