Which one of the following oxides of nitrogen is known as ‘anhydride’ of nitric acid ?<\/p>\n
[amp_mcq option1=”N2<\/sub>O” option2=”N2<\/sub>O3<\/sub>” option3=”NO2<\/sub>” option4=”N2<\/sub>O5<\/sub>” correct=”option4″]<\/p>\n Which one of the following oxides of nitrogen is known as ‘anhydride’ of nitric acid ? [amp_mcq option1=”N2O” option2=”N2O3” option3=”NO2” option4=”N2O5” correct=”option4″] This question was previously asked in UPSC NDA-1 – 2016 Download PDFAttempt Online An acid anhydride is a compound that reacts with water to form an acid. The anhydride of nitric acid (HNO\u2083) … <\/p>\n
\nThe formula for nitric acid is HNO\u2083. Taking two molecules and removing one water molecule:
\n2HNO\u2083 \u2192 H\u2082N\u2082O\u2086
\nH\u2082N\u2082O\u2086 – H\u2082O \u2192 N\u2082O\u2085
\nThus, N\u2082O\u2085 (dinitrogen pentoxide) is the anhydride of nitric acid. It reacts with water to form nitric acid: N\u2082O\u2085 + H\u2082O \u2192 2HNO\u2083.
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\n– To find the anhydride of an acid (like HNO\u2083), remove water molecule(s) from the acid formula while maintaining the correct ratio of other elements.
\n– N\u2082O\u2085 is dinitrogen pentoxide.
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