Among the options given below, identify the Isoelectronic species:

1. CO, CN, NO+, C22–

2. CO, CN, NO, C2

3. CO+, CN+, NO, C2

4. CO, CN, NO, C2

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 87%
From NCERT
AIPMT - 2000
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The correct order in which the O-O bond length increases in the following is:

1. O3<H2O2<O2

2. O2<O3<H2O2

3. O2<H2O2<O3

4. H2O2<O2<O3

Subtopic:  M.O.T |
 70%
AIPMT - 2005
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Which of the following molecules has trigonal planar geometry:

1. NH3 2. BF3
3. PCl3 4. IF3
Subtopic:  V.S.E.P.R & V.B.T |
 87%
From NCERT
AIPMT - 2005
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Which of the following would have a permanent dipole moment:

1. BF3

2. SF4

3. SiF4

4. XeF4

Subtopic:  Polarity |
 69%
From NCERT
AIPMT - 2005
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The correct sequence of increasing covalent character is represented by:

1. BeCl2<NaCl<LiCl

2. NaCl<LiCl<BeCl2

3. BeCl2<LiCl<NaCl

4. LiCl<NaCl<BeCl2

Subtopic:  Resonance & Nature of Compounds |
 73%
From NCERT
AIPMT - 2005
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Which of the following is the electron deficient molecule:

1. C2H

2. SiH4

3. PH3

4. B2H

Subtopic:  Resonance & Nature of Compounds |
 87%
From NCERT
AIPMT - 2005
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A species that does not exhibit paramagnetism is:

1. N2+

2. O2

3. CO

4. NO

Subtopic:  M.O.T |
 79%
From NCERT
AIPMT - 2000
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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 |
 72%
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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