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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CN+, NO3+
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NO+, CN2-
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NO2+, O2-
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CN-, O2-
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O2-, CN+
A
Correct answer
Explanation
CN+ has 12 electrons.
NO3+ has 12 electrons.
Hence, both CN+ and NO3+ are isoelectronic species.
B
Correct answer
Explanation
F2O has bond angle of 102o with two bond pairs and two lone pairs of electrons.
Hence, F2O has the lowest bond angle (102o) and two lone pairs of electrons.
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Butane
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Pentane
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Hexane
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Heptane
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Octane
E
Correct answer
Explanation
Octane numbers decrease with increasing molecular weight. Octane has lowest octane number (-19) among given hydrocarbons.
B
Correct answer
Explanation
Arrhenius bases furnish OH- ions in their aqueous solutions.
Bronsted-Lowry bases are proton acceptors.
NH3 will not release OH- ions, but accept a proton to form NH4+.
Hence, NH3 is a Bronsted-Lowry base, but not an Arrhenius base.
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Phosphate
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Amino group
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Carboxyl group
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Methyl group
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Sulphate
D
Correct answer
Explanation
A methyl group is an alkyl derived from methane, containing one carbon atom bonded to three hydrogen atoms — CH3.
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Nitrogen
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Oxygen
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Carbon
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Phosphorus
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Sodium
C
Correct answer
Explanation
Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent, making four electrons available to form covalent chemical bonds.
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molecules of nitrogen
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atoms of nitrogen
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compounds of nitrogen
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ions of nitrogen
B
Correct answer
Explanation
2N represents two atoms of nitrogen.
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Dequadin
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Nitrofurazone
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Hexachlorophene
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Cetrimonium
B
Correct answer
Explanation
It is a bactericidal chemical being chiefly consumed as an antibiotic most commonly in the form of ointments.
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Carbon
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Nitrogen
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Oxygen
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Fluorine
D
Correct answer
Explanation
The atomic radius of fluorine atom is 64 pico metre. It is clear that fluorine is the smallest atom among the given options.
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An atom of chlorine
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An isotope of chlorine
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A molecule of chlorine
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An isobar of chlorine
C
Correct answer
Explanation
Cl2 represents two chlorine atoms, i.e. a molecule of chlorine.
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Molecular weight of a compound
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Number of atoms in a compound
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Ratio of weights of elements in a compound
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Nature of bonds between elements in a compound
D
Correct answer
Explanation
Chemical formula of a compound cannot depict the nature of bonding between two elements.
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Sodium forms acidic and positive radical.
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Chlorine forms basic and positive radical.
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Sodium forms positive and basic radical.
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Chlorine forms negative and basic radical.
C
Correct answer
Explanation
Sodium forms Na+ which is a basic and positive radical.
C
Correct answer
Explanation
S-2 is a simple ion with bivalent electronegativity.
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Compound consists of two atoms, i.e. sodium and carbonate.
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Valency of carbonate in the compound is - 2.
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Two different elements form this compound.
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Valency of sodium in sodium carbonate is + 2.
B
Correct answer
Explanation
Formula of sodium carbonate is Na2CO3. Valency of carbonate is - 2 in this compound.
