D. HNO3 and NaNO3; Pair of substances cannot form a buffered aqueous solution is hno3 and nano3.
More about HNO3 and NaNO3:
The inorganic substance with the formula HNO3 is nitric acid. It is a mineral acid that is quite corrosive. The substance is colourless, but older samples may have a yellow hue from breakdown into nitrogen oxides.
The majority of nitric acid that is sold commercially has a 68% concentration in water. Nitric acid that is flaring when the solution contains more than 86% HNO3.
The chemical with the formula NaNO 3 is sodium nitrate. To distinguish it from regular saltpetre, potassium nitrate, this alkali metal nitrate salt is sometimes known as Chile saltpetre Nitratine, nitratite, are other names.
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