In PO4-3, formal charge on every oxygen atom and P-O bond order respectively are:
1.  -0.75 and 1.25
2.  -0.5 and 2
3.  1 and 1.5
4.  -0.75 and 2

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 73%
From NCERT
AIPMT - 1998
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Among the following, the pair in which the two species are not isostructural is:

1. IO3and XeO3

2. BH4and NH4+

3. PF6and SF6

4. SiF4 and SF4

Subtopic:  Hybridisation |
 80%
From NCERT
AIPMT - 2004
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Increasing order of bond length is:

1. NO- < NO < NO+ < O2-

2. O2- < NO < NO- < NO+ 

3. O2- < NO- < NO< NO+ 

4. NO+ < NO < NO- < O2-

Subtopic:  M.O.T |
 66%
From NCERT
AIPMT - 1999
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H2O is dipolar, whereas BeF2 is not. It is because:
 

1. H2O involves hydrogen bonding whereas BeF2 is a discrete molecule.
2. H2O is linear and BeF2 is angular.
3. H2O is angular and BeF2 is linear.
4. The electronegativity of F is greater than that of O
Subtopic:  Polarity |
 76%
From NCERT
AIPMT - 2004
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In a regular octahedral molecule, MX6, the number of X–M–X bonds at 180º is:

1. Two 2. Six
3. Four 4. Three
Subtopic:  Hybridisation |
 70%
From NCERT
AIPMT - 2004
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The lone pairs in the BrF3 molecule, occupy equatorial positions to minimize:

1. Bond pair – bond pair repulsion only
2. Lone pair – lone pair repulsion and lone pair–bond pair repulsion
3. Lone pair–lone pair repulsion only
4. Lone pair–bond pair repulsion only
Subtopic:  V.S.E.P.R & V.B.T |
 75%
From NCERT
AIPMT - 2004
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The dipole moment of compound AB is 10.92 D and that of compound CD is 12.45 D. If the bond length of AB is 2.72 A° and that of CD is 2.56 A°, then for these compounds the correct statement is:
1.  More ionic nature in AB
2.  More ionic nature in CD
3.  Equal in both
4.  Cannot be predicted

Subtopic:  Polarity |
 74%
From NCERT
AIPMT - 1999
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Among the following, iso-electronic species are:

1. CO2, NO2

2. NO2-, CO2

3. CN, CO

4. SO2, CO2

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 84%
From NCERT
AIPMT - 2002
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 pπ-dπ bonding is present in:

1. NO3-

2. SO3-2

3. BO3-3

4. CO3-2

Subtopic:  Covalent Bond |
 86%
From NCERT
AIPMT - 2002
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In NO3 ion, the number of bond pair and lone pair of electrons on nitrogen atom are respectively:

1. 2, 2 2. 3, 1
3. 1, 3 4. 4, 0
Subtopic:  Covalent Bond |
 67%
From NCERT
AIPMT - 2002
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