Amongst the following, the total number of species NOT having eight electrons around the central atom in its outermost shell, is: 
\(\mathrm{NH}_3, \mathrm{AlCl}_3, \mathrm{BeCl}_2, \mathrm{CCl}_4, \mathrm{PCl}_5 \)
1. 1 2. 3
3. 2 4. 4
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 57%
From NCERT
NEET - 2023
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Which one of the following represents all isoelectronic species? 
1. \(Na^+ , Cl^-, O^- , NO^+\)
2. \(N_2O, N_2O_4 , NO^+, NO\)
3. \(Na^+ , Mg^{2+} , O^- , F^-\)
4. \(Ca^{2+} , Ar, K^+, Cl^-\)
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 75%
From NCERT
NEET - 2023
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Which pair of ions from the following list do not constitute an iso-electronic pair?

1. Mn2+, Fe3+

2. Fe2+, Mn2+

3. O2-, F-

4. Na+, Mg2+

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 77%
From NCERT
NEET - 2021
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NEET 2023 - Target Batch - Aryan Raj Singh
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Which of the following pairs of ions are isoelectronic and isostructural?

1. CO32-, SO32-

2. ClO3-, CO32-

3. SO32-, NO3-

4. ClO3-, SO32-

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 70%
From NCERT
NEET - 2015
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An isostructural compound with XeF among the following  is :
1. ICl2
2. SbCl3
3. BaCl2
4. TeF2
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 79%
From NCERT
AIPMT - 2013
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Identify the wrong statement among the following.

1. Amongst isoelectronic species, the smaller the positive charge on the cation, the smaller is the ionic radius
2. Amongst isoelectronic species, the greater the negative charge on the anion, the larger is ionic radius
3. Atomic radius of the elements increases as one moves down the first group of the periodic table
4. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 74%
From NCERT
AIPMT - 2012
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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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Which of the following two species in the pair are isostructural:

1.  XeF2 , IF2-

2. NH3 , BF3

3.  CO3-2 , SO3-2

4. PCl5 , ICI5

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 85%
From NCERT
AIPMT - 2001
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Among the following, the compound that is electron deficient is:

1. BaCl2

2. BCl3

3. CCl4

4. PCl5

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 84%
From NCERT
AIPMT - 2000
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NEET 2023 - Target Batch - Aryan Raj Singh
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh