Question

Which of the following statement(s) is/are corect
A. Water equalies the strength of `NaOH, KoH,CsOH` and `Ba(OH)_(2)`
B. Relative Strength of acids `HClO_(4), H_(2)SO_(4),HNO_(3)HI` etc. is determied by taking them in `CH_(3)COOH`
C. Relative strength of bases like `NaOH, Ba(OH)_(2),CaOH` and `KOH` can be determined by taking them in `H_(2)O`
D. `H_(3)BO_(3)`is a weak Lewis acid but not a Bronsted acid

Answer 1

Correct Answer - A::B::D
pH range (working range) foran acid indicator is
`pK_(a) +- 1, :. pK_(a) = 5`
If indicator is `50%` ionized, then `["Hin"] = ["In"^(-)]`
`:. pH = pK_("In"), pK_(a) = 10^(-5)`