Correct formula for dinitrogen monoxide is?
A.${N_2}O$
B.${N_2}{O_5}$
C.${N_4}{O_2}$
D.$NO$
E.$N{O_2}$

Hint: Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide ($NO$) and nitrogen dioxide. Other gases belonging to this group are nitrogen monoxide and nitrogen pentoxide.

Complete Step by Step Solution:
a)Dinitrogen monoxide, also known as nitrous oxide, is an inorganic compound with a chemical formula ${N_2}O$ . It is colourless and inflammable at room temperature with a slight taste and scent of metals. It acts as a powerful oxidizer quite similar to the molecular oxygen at elevated temperature. In this short piece of article, let us discuss the dinitrogen monoxide formula, its chemical structure, properties and uses of dinitrogen monoxide. It is also known as Nitrous Oxide, Dinitrogen oxide, and Laughing gas.
b)Nitrous oxide is prepared on an industrial scale by careful heating of ammonium nitrate, which decomposes into nitrous oxide and water vapour. The addition of various phosphate salts favours formation of a purer gas at slightly lower temperatures. This reaction may be difficult to control, resulting in detonation.

Laboratory methods: The decomposition of ammonium nitrate is also a common laboratory method for preparing the gas. Equivalently, it can be obtained by heating a mixture of sodium nitrate and ammonium sulfate.
Another method involves the reaction of urea, nitric acid and sulfuric acid.
Hydroxylammonium chloride reacts with sodium nitrite to give nitrous oxide. If the nitrite is added to the hydroxylamine solution, the only remaining by-product is salt water. If the hydroxylamine solution is added to the nitrite solution (nitrite is in excess), however, then toxic higher oxides of nitrogen also are formed.

Hence, the correct option is A.

Note Nitrous Oxide Uses: Used as a medical anesthetic and analgesic , used as a propellant for dispensing fatty liquids and used as a fuel additive in ca racing. Hyponitrous acid decomposes to $N_2O$ and water.