At first ka value of the acid given should be written because more the ka value more acidic strength and less ka means less acidic characteristics.
So ,ka of HCLO = 2.9 × 10^-8
ka of HS- = 6.2 × 10^-8
Ka of HNO2 = 4.5 × 10^-4
Hence ,ka value is least for HCLO so,weakest acid is HCLO.
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