From the perspective of molecular orbital theory, which statement is false?

1. Be2 is not a stable molecule.

2. He2 is not stable but He2+ is expected to exist.

3. Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.

4. The order of energies of molecular orbitals in N2 molecule is: 

σ2s<σ2s*<σ2pz<(π2pxπ2py)
<(π2px*π2py*)<σ2pz*

Subtopic:  M.O.T |
 75%
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What is the correct sequence of bond order for the specified species?

1. \(\mathrm{O}^-_2>\mathrm{O}_2>\mathrm{O}^+_2\) 2. \(\mathrm{O}^-_2<\mathrm{O}_2<\mathrm{O}^+_2\)
3. \(\mathrm{O}^-_2>\mathrm{O}_2<\mathrm{O}^+_2\) 4. \(\mathrm{O}^-_2<\mathrm{O}_2>\mathrm{O}^+_2\)
Subtopic:  M.O.T |
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Match the species in Column I with the type of hybrid orbitals in Column II.

Column I

Column II

A. SF4

1. sp3d2

B. IF5

2. d2sp3

C. NO2+

3. sp3d

D. NH4+

4. sp3

5. sp

Codes

Options:  A   B   C   D 
1. 3 1 5 4
2. 1 2 3 5
3. 5 4 3 2
4. 4 5 3 2

       

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 88%
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Match the species in Column I with the shape in Column II.

Column I

Column II

A. H3O+

1. Linear

B. HCCH

2. Angular

C. ClO2-

3. Tetrahedral

D. NH4+

4. Trigonal bipyramidal

5. Pyramidal

Codes

Options:  A   B   C   D 
1. 5  1  2  3
2. 1  2  3  5
3. 5  4  3  2
4. 4  5  3  2

 

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 89%
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Match the species in Column I with the bond order in Column II.

Column I

Column II

A. NO

1. 1.5

B. CO

2. 2.0

C. O2-

3. 2.5

D. O2

4. 3.0

Codes

Options:  A   B   C   D 
1. 3 4 1 2
2. 1 2 3 5
3. 5 4 3 2
4. 4 5 3 2

Subtopic:  M.O.T |
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Match the items given in Column I with examples given in Column II.

Column I

Column II

A. Hydrogen bond

1. C

B. Resonance

2. LiF

C. Ionic solid

3. H2

D. Covalent solid

4. HF

5. O3

Codes

Options:  A   B   C   D 
1. 2 3 4 1
2. 1 2 3 5
3. 5 4 3 2
4. 4 5 2 1

Subtopic:  Resonance & Nature of Compounds |
 91%
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Match the shape of molecules in Column I with the type of hybridization in Column II.

Column I

Column II

A. Tetrahedral

1. sp2

B. Trigonal

2. sp

C. Linear

3. sp3

Codes

Options:  A   B   C 
1. 3 1 2
2. 1 2 3
3. 5 4 3
4. 4 5 3

       

      

 

Subtopic:  Hybridisation |
 95%
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Given below are two statements: 

Assertion (A):  Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.
Reason (R):  This is because sodium and chloride ions acquire octet in sodium chloride formation.

 

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Ionic Bond |
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Given below are two statements: 

Assertion (A): Though the central atom of both NH3 and H2O molecules are sp3 hybridised, yet H-N-H bond angle is greater than that of H-O-H.
Reason (R): This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  V.S.E.P.R & V.B.T |
 87%
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Given below are two statements: 

Assertion (A): Among the two O-H bonds in H2O molecule, the energy required to break the first O-H bond and the other O-H bond is the same.
Reason (R): This is because the electronic environment around oxygen is the same even after breakage of one O-H bond.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

Subtopic:  Lattice & Hydration Energy |
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