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# If $pK_{in}$ of an indicator is 10.5, the pH transition range for which it is most suitable is

(a) 8.5-10.5
(b) 10.5-12.5
(c) 10.0-11.0
(d) 9.5-11.5

The pH transition range for an indicator = $pK_{in}\pm 1 = 10.5 \pm 1$
Therefore, the suitable range is 9.5-11.5