Chemistry
Chemical Bonding and Molecular Structure
1,277 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
B
Correct answer
Explanation
Amides (like asparagine and glutamine) have a high Nitrogen to Carbon ratio, which makes them efficient forms for transporting nitrogen throughout the plant.
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ionic bond
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covalent bond
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none of these
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metallic bond
A
Correct answer
Explanation
Ionic bonds typically form between metals (which lose electrons) and non-metals (which gain electrons) due to the electrostatic attraction between oppositely charged ions.
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van der Waals bond
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covalent bond
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metallic bond
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ionic bond
D
Correct answer
Explanation
An ionic bond involves the transfer of electrons from one atom to another to achieve a stable octet. If one atom gives electrons and another receives them, it is an ionic interaction.
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one atom gives an electron and the other takes it
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the atoms share the electrons because they both need one
B
Correct answer
Explanation
Covalent bonding is characterized by the sharing of electron pairs between atoms. This occurs because the atoms involved have similar electronegativities and both need electrons to complete their outer shells.
C
Correct answer
Explanation
In the NaCl crystal lattice, each sodium ion is octahedrally surrounded by 6 chloride ions, and each chloride ion is surrounded by 6 sodium ions.
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All compounds are molecules.
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All Molecules are compounds.
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All Molecules and compounds are elements.
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Molecules and Compounds are not related at all.
A
Correct answer
Explanation
A molecule is a group of atoms bonded together. A compound is a substance formed when two or more different elements are chemically bonded. Since all compounds are made of molecules (or formula units), the statement that all compounds are molecules is generally accepted in introductory contexts.
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Covalent Bond
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Ionic Bond
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Super Glue
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Physical Bond
A
Correct answer
Explanation
A covalent bond is defined by the sharing of electron pairs between atoms. In contrast, ionic bonds involve the transfer of electrons.
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Hydronium ions
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Hydroxide ions
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hydrogen
B
Correct answer
Explanation
Bases are substances that release hydroxide ions (OH-) when dissolved in water.
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hydro compounds
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monoprotic
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weak electrolytes
B
Correct answer
Explanation
A monoprotic acid is defined as an acid that can donate only one proton (hydrogen ion) per molecule. Hydro compounds is a general term, and weak electrolytes refers to the degree of dissociation, not the number of ionizable hydrogens.
B
Correct answer
Explanation
HBr and HNO3 are strong acids that dissociate completely in water, making them strong electrolytes. H2CO3 (carbonic acid) is a weak acid that only partially dissociates, classifying it as a weak electrolyte.
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never
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slightly
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completely
C
Correct answer
Explanation
Strong electrolytes are substances that ionize or dissociate completely when dissolved in water, resulting in a high concentration of ions in the solution.
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A positively charged ion.
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A negatively charged ion.
B
Correct answer
Explanation
An anion is a negatively charged ion, formed when an atom or molecule gains one or more electrons.
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A positively charged ion.
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A negatively charged ion
A
Correct answer
Explanation
A cation is a positively charged ion, formed when an atom or molecule loses one or more electrons.
A
Correct answer
Explanation
Ionic bonds are formed through the electrostatic attraction between oppositely charged ions, which occurs when one atom transfers electrons to another.
B
Correct answer
Explanation
Covalent bonds are characterized by the sharing of electron pairs between atoms to achieve stability.