
(a)
Interpretation: The authenticity of the given statement is to be determined.
Concept introduction: The alkali metals occur in the combined state and occur in the minerals in the earth’s crust.
The melting point of gallium is
Reaction of calcium with water is,
Reaction of aluminum trichloride with water is,
Lithium reacts in the presence of oxygen as,
To determine: The authenticity of the statement, “Phosphoric acid is a stronger acid than nitric acid.”
(b)
Interpretation: The authenticity of the given statement is to be determined.
Concept introduction: The alkali metals occur in the combined state and occur in the minerals in the earth’s crust.
The melting point of gallium is
Reaction of calcium with water is,
Reaction of aluminum trichloride with water is,
Lithium reacts in the presence of oxygen as,
To determine: The authenticity of the statement, “The noble gas with the lowest boiling point is helium.”
(c)
Interpretation: The authenticity of the given statement is to be determined.
Concept introduction: The alkali metals occur in the combined state and occur in the minerals in the earth’s crust.
The melting point of gallium is
Reaction of calcium with water is,
Reaction of aluminum trichloride with water is,
Lithium reacts in the presence of oxygen as,
To determine: The authenticity of the statement, “Sulfur is found as the free element in the earth’s crust.”
(d)
Interpretation: The authenticity of the given statement is to be determined.
Concept introduction: The alkali metals occur in the combined state and occur in the minerals in the earth’s crust.
The melting point of gallium is
Reaction of calcium with water is,
Reaction of aluminum trichloride with water is,
Lithium reacts in the presence of oxygen as,
To determine: The authenticity of the statement, “One of the atoms in Teflon is fluorine.”
(e)
Interpretation: The authenticity of the given statement is to be determined.
Concept introduction: The alkali metals occur in the combined state and occur in the minerals in the earth’s crust.
The melting point of gallium is
Reaction of calcium with water is,
Reaction of aluminum trichloride with water is,
Lithium reacts in the presence of oxygen as,
To determine: The authenticity of the statement, “The

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Chapter 20 Solutions
Chemistry with Access Code, Hybrid Edition
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