<p>10 mL of concentrated&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>H</mi><mn>2</mn></msub><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;( 18 M) is diluted to one litre. The approximate molarity of the dilute acid is:</p>