Which of the following species has tetrahedral geometry(shape)?

1. BH4-

2. NH2-

3. CO32-

4. H3O+

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
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Which molecule /ion out of the following does not contain unpaired electrons?

1. N2+

2. O2

3. O22-

4. B2

Subtopic:  M.O.T |
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Which of the following order of energies of molecular orbitals of  N2  is correct?

1. π2py < σ2pz < π*2px  π*2py

2. π2py > σ2pz > π*2px  π*2py

3. π2Py < σ2pz > π*2px π2py

4. π2py > σ2pz < π*2px π*2py

Subtopic:  M.O.T |
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Match the species in Column I with the 5 types of hybrid orbitals given  in Column II:

Column I Column II
1 \(SF_4\) (a) \(sp^3d^2\)
2 \(IF_5\) (b) \(d^2sp^3\)
3 \(NO^+_2\) (c) \(sp^3d\)
4 \(NH^+_4\) (d) \(sp^3\)
(e) \(sp\)

1. (1) → (a), (2) → (b), (3) → (e), (4) → (d)

2. (1) → (c), (2) → (a), (3) → (e), (4) → (d)

3. (1) → (d), (2) → (a), (3) → (e), (4) → (c)

4. (1) → (e), (2) → (b), (3) → (c), (4) → (d)

Subtopic:  Hybridisation |
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Match the species in Column I with the shape in Column II.

Column I (Species) Column II (Shapes)
(1)  H3O+ (a)  Linear
(2)  HC≡CH (b)  V-shape/bent
(3)  CIO2 (c)  Tetrahedral
(4)  NH4 (d)  Trigonal bipyramidal
(e)  Pyramidal


1. (1) → (d), (2) → (a), (3) → (b), (4) → (c)

2. (1) → (b), (2) → (a), (3) → (e), (4) → (c)

3. (1) → (e), (2) → (a), (3) → (b), (4) → (c)

4. (1) → (c), (2) → (a), (3) → (b), (4) → (d)

Subtopic:  V.S.E.P.R & V.B.T |
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Which of the following species absorb maximum energy in its HOMO-LUMO electronic tranistion ?

1. O2
2. N2-
3. C2
4. N2

 

Subtopic:  M.O.T |
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Which of the following facts given is not correct/

(I) Bond length order : H2- = H2+ > H2

(II) O2+, NO, N2- have same bond order of 212

(III) Bond order can assume any value including zero upto four

(IV) NO3- and BO33- have same bond order for X - O bond (where X is central atom)

1. I, II & III

2. I & IV

3. II & IV

4. I & II

Subtopic:  M.O.T | V.S.E.P.R & V.B.T |
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N2 and O2 are converted to monocations N2+ and O2+ respectively, which is wrong statements:

1. In N2+, the N-N bond weakens

2. In O2+, the O-O bond order increases

3. In O2+, the paramagnetism decreases

4. N2+ becomes diamagnetic

Subtopic:  M.O.T |
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In which of the following transformations, the bond order has increased and the magnetic behavior has changed?

1. C2+  C2
2. NO+ NO
3. O2  O2+
4. N2  N2+

Subtopic:  M.O.T |
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BF3 and NF3 both are covalent compounds but NF3 is polar whereas BF3 is non-polar. This is because :

1. Nitrogen atom is smaller than boron atom

2. N-F bond is more polar than B-F bond

3. NF3 is pyramidal whereas BF3 is planar triangular

4. BF3 is electron deficient whereas NF3 is not

Subtopic:  Polarity |
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