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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Which of the following is the most basic oxide?

1. Al2O3

2. Sb2O3

3. Bi2O3

4. SeO2

Subtopic:  Acidic, Basic Character & Fajan's Rule |
 64%
From NCERT
AIPMT - 2006
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The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is:

1.  13 σ bonds and no π bond

2.  10 σ bonds and 3 π bonds

3.  8 σ bonds and 5 π bonds

4.  11 σ bonds and 2 π bonds

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 85%
From NCERT
NEET - 2019
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The decreasing order of stability of O2,O2-,O2+ and O22-is: 

1. O2+>O2>O2->O22-

2. O22->O2->O2>O2+

3. O2>O2+>O22->O2-

4. O2->O22->O2+>O2

Subtopic:  M.O.T |
 75%
From NCERT
NEET - 2015
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An incorrect statement among the following:
1. The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4
2. The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3
3. The H-C-H bond angle in CH4, the H-N-H bond angle in NH3 and the H-0-H bond
angle in H2O are all greater than 90o
4. The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3
Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 73%
From NCERT
NEET - 2016
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In piperidine "N" atom has hybridization:

piperidine

1. sp

2. sp2

3. sp3

4. dsp2

Subtopic:  Hybridisation |
 71%
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The strongest hydrogen bond present among the following is-

1. OHS

2. SHO

3. FHF

4. FHO

Subtopic:  van der Waal Force & Hydrogen Bonding |
 78%
From NCERT
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Among the following atomic orbital overlaps, the non-bonding overlap is:
 

1. 2.  
3.   4.

Subtopic:  Covalent Bond |
 76%
From NCERT
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A pair in which both species are not likely to exist is:

1. \(H^+_2,He^{2-}_2\) 2. \(H^-_2,He^{2+}_2\)
3. \(H^{2+}_2,He_2\) 4. \(H^-_2,He^{2+}_2\)
Subtopic:  M.O.T |
 82%
From NCERT
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Combination of atoms A and B that forms an anti-bonding molecular orbital is :

1. ΨA2ΨB2

2. ΨA2×ΨB2

3. ΨA+ΨB

4. ΨA-ΨB

Subtopic:  M.O.T |
 74%
From NCERT
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