The lone pairs of electrons can be defined as -

1. Electron pairs that participate in bonding.

2. Electron pairs  that do not participate in bonding.

3. Electron pairs that are present in inner most shell.

4.Electron pairs that are present in valence shell of ions.

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 84%
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The correct Lewis structure of acetic acid is:
 

1. 2.
3. 4. None of the above.
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 83%
From NCERT
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An electron-deficient compound among the following is:

1. (SiH3)2 2. (BH3)2
3. PH3 4. (CH3)2
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 79%
From NCERT
AIPMT - 2013
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The Lewis dot symbols for atoms of the elements Mg, Na, O, and N, respectively, would be:

1.
2.
3.
4.
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 85%
From NCERT
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Lewis symbols for the atoms and ions: S and S2–; Al and Al3+; H and H respectively, would be:

1. :S....:2- Al3+
2. :S....:2- Al3+  
3. :S....:2- Al3+
4. :S....:2-  Al3+
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 80%
From NCERT
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Which among the following does not contain a set of isoelectronic species?

1. SO3-2, CO32-, NO3-

2. CN-, N2, CO

3. BO33- , CO32- ,NO3-

4. PO43-, SO42-, ClO4-

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 73%
From NCERT
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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 the ionic radius.
2. Amongst isoelectronic species, the greater the negative charge on the anion, the larger is the ionic radius.
3. The atomic radius of the elements increases as one moves down the first group of the Periodic Table.
4. The 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 |
 71%
From NCERT
AIPMT - 2012
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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 |
 75%
From NCERT
NEET - 2015
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The significance of the octet rule is:

1. To determine the stability of atoms.

2. To find the hybridization of elements.

3. To calculate the number of lone pairs.

4. None of the above.

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 72%
From NCERT
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From the following pairs of ions which one is not an iso-electronic pair?

1. Mn2+, Fe3+

2. Fe2+, Mn2+

3. O2-, F-

4. Na+, Mg2+

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 76%
From NCERT
NEET - 2021
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