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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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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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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Correct Lewis structure of the nitrite ion, \(NO_{2}^{-}\) among the following is:

1. 2.
3. 4. None of the above
Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 79%
From NCERT
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The decreasing order of ionic character of the N-H, F-H, C-H, and O-H, is :  

1. N-H > F-H > C-H > O-H
2. F-H > N-H > C-H > O-H
3. O-H > C-H > F-H > N-H
4. F-H > O-H > N-H > C-H

Subtopic:  Ionic Bond |
 82%
From NCERT
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The right order of increase in the ionic character of the molecules,
 
LiF, K2O, N2, SO2, ClF3 is :

1. N< SO< ClF< K2O < LiF

2. N2 > SO2 > ClF> K2O < LiF

3. N> SO> ClF> K2O > LiF

4. LiF > K2O < ClF3 > SO2 > N2

Subtopic:  Ionic Bond |
 63%
From NCERT
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The molecules that have an overall permanent dipole moment among the following is/are: 
(A) CO2
(B) H2O
(C) NH3
1. A and C only 2. C and B only
3. A, B, and C 4. None of them

Subtopic:  Polarity |
 84%
From NCERT
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From the following, the incorrect assertion with respect to dipole moments of the species given is: 
1. \(CH_3Cl > CHCl_3 \)
2. \(CH_2Cl_2 = CCl_4 \)
3. \(NH_3 > NF_3 \)
4. \(BF_3 = CO_2 \)
Subtopic:  Polarity |
 62%
From NCERT
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Which one of the following statements is true about the structure of \(CO^{2-}_3\) ion?

1. It can be explained by considering sp3 hybridization.
2. Out of the three C–O bonds, two are longer and one is shorter.
3. It has three Sigma and three \(\pi\)-bonds.
4. All three C–O bonds are equal in length with a bond order in between 1 and 2.
Subtopic:  Resonance & Nature of Compounds |
 52%
From NCERT
NEET - 2022
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Assertion (A): Sigma (\(\sigma\)) bond is strong, while pi (\(\pi\)) bond is weak.
Reason (R): Atoms rotate freely about pi (\(\pi\)) bond.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Types of Chemical Bond |
 71%
From NCERT
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