<p>Some of the properties of the two species,&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML" class="wrs_chemistry"><msubsup><mi>NO</mi><mn>3</mn><mo>-</mo></msubsup><mo>&#160;</mo><mi>and</mi><mo>&#160;</mo><msub><mi mathvariant="normal">H</mi><mn>3</mn></msub><msup><mi mathvariant="normal">O</mi><mo>+</mo></msup></math>&nbsp;are described below. Which one of them is correct?</p>