Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: \[\text{HCl}{{\text{O}}_{\text{4}}}\]is a stronger acid than\[\text{HCl}{{\text{O}}_{3}}.\] Reason: Oxidation state of \[\text{Cl}\] in \[\text{HCl}{{\text{O}}_{4}}\]is + 8 and in \[\text{HCl}{{\text{O}}_{\text{3}}}\text{+}\,\text{5}\text{.}\]A) If both assertion and reason are true and reason is not the correct explanation of assertion.
B) If both assertion and reason are true but reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false
Correct Answer: C
Solution :
\[\text{HCl}{{\text{O}}_{\text{4}}}\]is stronger acid than \[\text{HCl}{{\text{O}}_{3}}.\]Oxidation states of \[\text{Cl}\] in \[\text{HCl}{{\text{O}}_{4}}\] and \[\text{HCl}{{\text{O}}_{3}}\] are + 7 and + 5 respectively. Among oxy-acids of halogens or other non-metals, as the number of oxygen atom increases (also the oxidation state of central atom increase), the acidity increases. The reason is that the doubly bonded O-atoms are powerful electron withdrawing which weaken ?OH bond and thus proton can be easily donated. \[\underset{HCl{{O}_{4}}}{\mathop{H-O-\underset{O}{\overset{O}{\mathop{\underset{|\,|}{\overset{\,||}{\mathop{Cl}}}\,}}}\,=O}}\,\] \[H-O-\underset{{}}{\overset{O}{\mathop{\underset{HCl{{O}_{3}}}{\overset{\,||}{\mathop{Cl}}}\,}}}\,=O\]
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