
(a)
Interpretation:
The highest oxidation state of oxide in each mentioned elements has to be identified.
Concept introduction:
Oxidation state:
As per the IUPAC definition, the charge of the atom is the oxidation state of an atom after ionic approximation of its heteronuclear bonds or it is a number assigned to an atom or an element which represents the number of electrons lost or gained.
(b)
Interpretation:
The acidic or basic or amphoteric nature of the oxides has to be identified.
Concept introduction:
Acid:
The substance which is capable of accepting a pair of nonbonding electrons and forms covalent bond
Base:
The substance which is capable of donating a pair of nonbonding electrons
Amphoteric compound:
It can behave like acid as well as base in a
(c)
Interpretation:
The most ionic oxide and most covalent oxide have to be identified.
Concept introduction:
Covalent bond:
The bond which involves sharing of electrons between the atoms present in the molecule
Ionic bond:
The bond which involves transfer of electrons between the atoms present in the molecule
(d)
Interpretation:
The molecular oxide and solids with infinitely extended three dimensional crystal structures have to be identified.
Concept introduction:
Three dimensional crystal structures:
The orderly arrangement of the atoms and ions of crystal which are extended further and held together by internal bonding forces
(e)
Interpretation:
The oxide with highest melting point and lowest melting point has to be identified.
Concept introduction:
Melting point:
The temperature at which the given solid material changes to liquid is known as melting point.
Lattice energy:
It is the measure of energy released when ions come together to make a compound. The unit of lattice energy is

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Chapter 18 Solutions
General Chemistry: Atoms First
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