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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Lithiumhydride
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Lithium ethoxide
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Lithium propnoate
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Lithium dimethylamide
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Tert-butyllithium
E
Correct answer
Explanation
This option is correct because in Tert-butyllithium, (CH3)3C, Li+ Lithium metal is directly bonded to carbon atom, hence Tert-butyllithium is an organometallic compound.
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Molecules
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Atom
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Compound
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All
B
Correct answer
Explanation
The name atom comes from the Greek word (atomos, indivisible) which means indivisible, something that cannot be divided further.
A
Correct answer
Explanation
It is a member of group IV A.
C
Correct answer
Explanation
A binary compound consists of exactly two different elements. HCl (hydrochloric acid) is composed of hydrogen and chlorine, making it a binary compound.
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Carbon tetrachloride.
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Carbon disulphide.
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Alcohol.
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Benzene.
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β-conformation
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α-conformation
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A-conformation
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None of these
B
Correct answer
Explanation
The alpha-helix is a tightly coiled structure where the carbonyl oxygen of one amino acid forms a hydrogen bond with the amide hydrogen of the fourth amino acid down the chain, maximizing internal hydrogen bonding.
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Covalent compound
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Ionic compounds
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Co-ordination compounds
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Organic compounds
C
Correct answer
Explanation
Co-ordination compounds are compounds in which the central metal atom is linked to a number of ions or neutral molecules by co-ordinate bonds.
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complex ion
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central atom / ion compounds
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hetroliptic complex
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homopletic complex
D
Correct answer
Explanation
Important complex in which a metal is bound to only one kind of donor group are known as homoleptic complexe e.g., [CO (NH3)6)]3+ .In this componud the donor group is only NH3.
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Crystal Field Theory
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Werner's theory
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MO theory
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VB theory
B
Correct answer
Explanation
Alfred Werner suggested in 1893 that metal ions exhibit what he called primary and secondary valences. This first theory was called the Werner's theory of co-ordination compounds.
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Charge on the central metal ion
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Basic nature of ligand
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Presence of chelate rings
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None of these
D
Correct answer
Explanation
All the above mentioned three factors affect the stability of the complex ion.
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The Valence Shell Electron Pair Repulsion (VSEPR) model
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MO theory
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VB theory
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Crystal Field Theory
D
Correct answer
Explanation
Bonding in a complex ion is due to electrostatic interactions between the positively charged nucleus of the central metal ion and electrons in the ligands i.e., attractive as well as repulsive interactions
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ionisation isomers
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hydrate isomers
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linkage isomers
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coordination isomers
A
Correct answer
Explanation
Compounds, which give different ions in solution although they have same composition are called ionization isomers. There is an exchange in groups between the coordination sphere of the metal ion and ions outside the sphere.
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Ammonium nitrate
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Urea
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Calcium nitrate
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Ammonium chloride
B
Correct answer
Explanation
Urea (NH2CONH2) has a molar mass of 60 g/mol and contains 28 g of nitrogen, resulting in approximately 46.6 percent nitrogen by mass, which is higher than the other options.
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molecular crystals
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covalent crystals
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metallic crystals
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ionic crystals
D
Correct answer
Explanation
The ionic crystals consist of positively and negatively charged ions arranged in a regular fashion throughout the crystal. They form a network of positive and negative ions in three dimension in such a way that cations and anions occupy alternate sites. These are held together by strong electrostatic forces.Common examples of ionic crystals are, salts like NaCl, KNO3, LiF etc.