<p>5g of a sample of bleaching powder is treated with excess acetic acid and KI solution. The liberated&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>I</mi><mn>2</mn></msub></math>&nbsp;required 50 mL of N/10 hypo. The percentage of available chlorine in the sample is:</p>