(a)
Interpretation: The formula of nitrous acid should be written.
Concept Introduction: The formula of compound identifies the atoms or ions present in it. The formula is formed by crisscross method, in which, charge on one ion goes to subscript of other and vice versa. The acid name ends with −ous acid is related to acid name ending with −ic acid. The only difference is in −ous acid there is one oxygen atom less than that in −ic acid.
(b)
Interpretation: The formula of phosphorous acid should be written.
Concept Introduction: The formula of compound identifies the atoms or ions present in it. The formula is formed by crisscross method, in which, charge on one ion goes to subscript of other and vice versa. The acid name ends with −ous acid is related to acid name ending with −ic acid. The only difference is in −ous acid there is one oxygen atom less than that in −ic acid.
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