which of the following statement is not correct for the nitrogen dioxide?

Options

A. It is paramagnetic
B. It dimerizes into colourless `N_(2)O_(4)`
C. It acts as an oxidizing as well as a reducing agent
D. it is a neutral oxide

Answer

4

Explanation

Nitrogen dioxide is an acidic oxide. It dissolves in water very readily giving an acidic solution:
`2NO_(2)(g) +H_(2)O(l) hArr HNO_(3)(aq.)+HNO_(2)(aq.)`
On account of this, it is known as mixed an hydride of these two acide. However, with an excess of warm water it forms nitric acid and nitric oxide.
`3NO_(2)+H_(2)O overset("warm")(rarr)2HNO_(3)+NO`
When absorbed by alkalies, nitrates are formed:
`2NO_(2)+2NaOHrarrNaNO_(2)+NaNO_(3)+H_(2)O`
`NO_(2)` molecule is an odd electron molecule. The paramagnetic nature of `NO_(2)` confirms this view. Due to possession of an odd electron, it is colored and has a tendency to form a colorless, diamagnetic dimer `N_(2)O_(4)`.
It acts as an oxidizing agent, oxidizing metals like sodium, potassium, mercury, tin, copper etc
`NO_(2)+2Na rarr Na_(2)O+NO`
`NO_(2)+2Cu rarr Cu_(2)O+NO`. Nonmetals like carbon , sulphur, phosphorus when burnt in its atmosphere are converted into corresponding oxide:
`2NO_(2)+C rarr CO_(2)+2NO`
`2NO_(2)+S rarr SO_(2)+2NHO`
`5NO_(2)+2P rarr P_(2)O_(5)+5NO`
It liberates iodine form KI and turns starch- iodide paper blue.
`2Kl+2NO_(2)rarr2KNO_(2)+I_(2)` In aqueous solution it oxidizes sulphur dioxide to sulphuric acid:
`SO_(2)+H_(2)O+NO_(2)rarrH_(2)SO_(4)+NO`
This reaction is used for the manufacture of `H_(2)SO_(4)` by lead chamber process. Hydrogen sulphide is oxidized to sulphur while carbon monoxide is oxidized to carbon duoxide:
`H_(2)S+NO_(2)rarrH_(2)O+S+NO`
`CO+NO_(2)rarrCO_(2)+NO`
It aiso behaves as a reducing agent, e.g. it reduces ozone to oxygen:
`2NO_(2)+O_(3)rarrN_(2)O_(5)+O_(2)`
It declourises acidified `KMnO_(4)` solution
`{:(2KMnO_(4)+3H_(2)SO_(4) rarr K_(2)SO_(4)+2MnSO_(4)+3H_(2)O+5O),(10NO_(2)+5H_(2)O+5O rarr 10 HNO_(3)),(bar(2KMnO_(4)+3H_(2)SO_(4)+10NO_(2)+2H_(2)O rarr K_(2)SO_(4)+2MnSO_(4)+10HNO_(3))):}`