Chemistry
Chemical Bonding and Molecular Structure
1,420 Questions
This section tests your knowledge of chemical bonding, molecular structure, and hybridization. It covers ionic and covalent bonds, octet rule exceptions, and molecular geometry. These chemistry questions are common in various competitive entrance examinations.
Ionic and covalent bondsHybridisation of elementsOctet rule exceptionsMolecular geometryIntermolecular forces
Chemical Bonding and Molecular Structure Questions
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nitrogen
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sulphur
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phosphorus
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carbon
D
Correct answer
Explanation
The common element in all organic compounds, other than H2, is carbon.
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CaOCO3
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CH3COOH
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HCOOH
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H3C–CO–CH3
A
Correct answer
Explanation
CaOCO3 is not an organic compound because carbon is an essential element of all organic compounds.
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C – C
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C – H
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C – O
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Si – Si
A
Correct answer
Explanation
C – C bond is the most stable covalent bond among all the given bonds.
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Matrix
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Proton
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Zwitterion
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Cation
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Anion
D
Correct answer
Explanation
A metalloid is a chemical element with properties that are in between a mixture or those of metals and non-metals. It is considered to be difficult to classify unambiguously as either a metal or a non metal. Iron is a metal. So, it does not have the properties of metalloids.
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As, Sb
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Ga, Po
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Tl, In
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As, Ga
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Sb, In
A
Correct answer
Explanation
Both As and Sb belong to group b15 and are metalloids, which have the properties of metals as well as non-metals. Metalloids do not form positive ions in chemical reactions. Metals and poor metals both form active positive ions during the chemical reactions.
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Equal densities
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Sublimation property
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Equal melting points
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Pure homogeneous mixtures
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Equal boiling points
B
Correct answer
Explanation
Yes, all the above substances have sublimation property.
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both the electrons of a shared pair come from the same atom
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each atom supplies one electron to the bond
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hydrogen bond is formed
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none of these
A
Correct answer
Explanation
A co-ordinate bond is a covalent bond (a shared pair of electrons) in which both the electrons of a shared pair come from the same atom.
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HCl
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BaCl2<o:p></o:p>
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N2H5+<o:p></o:p>
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H2O<o:p></o:p>
C
Correct answer
Explanation
Co-ordinate covalent bond is formed by sharing one pair of electrons between the two atoms. In this pair, both electrons come from one atom and the remaining atom donates none. For this, one of the atoms should have at least one lone pair of electrons. The other atom should have an empty valance orbital.
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90˚
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109˚ 28�
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120˚
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90˚, 120˚
D
Correct answer
Explanation
In trigonal bipyramidal molecules, the bond angles are 90˚ and 120˚.
D
Correct answer
Explanation
Bond order = (Nb-Na)/2
Where,
Nb = number of electrons in bonding orbitals
Na = number of electrons in antibonding orbitals
Ne2 has equal number of bonding and antibonding electrons.
Hence, bond order of Ne2 is zero.
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single bond
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polar bond
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non-polar bond
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pi-bond
B
Correct answer
Explanation
In polar covalent bonds, the shared pair of electrons is found more shifted towards highly electronegative element.
B
Correct answer
Explanation
NaOH has both covalent and ionic bonds.
Covalent bond----- O-H
Ionic bond----- Between Na+ and OH-
B
Correct answer
Explanation
SO2 has sp2 hybridization.
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decreases
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increases
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does not change
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becomes zero
B
Correct answer
Explanation
With increase in s-character of hybridised orbital, the bond angle also increases.