\(\mathop {\mathop {HClO_3}\limits_{III} }\limits_{\left( {PKa = - 3} \right)} > \mathop {\mathop {{H_3}P{O_3}}\limits_{II} }\limits_{\left( {PKa = 1.3} \right)} > \mathop {\mathop {{H_2}S{O_4}}\limits_I }\limits_{\left( {PKa = 2} \right)} \)
$(I)$ $TeF_6$ $(II)$ $SF_6$ $(III)$ $NCl_3$ $(IV)$ $NF_3$
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