Question

Nitrogen dioxide is:

• A. soluble in $HN{O}_3$
• B. insoluble in $HN{O}_3$
• C. soluble in $HN{O}_3$ at higher temperature
• D. insoluble in $H_{2}O$

Answer 1

The correct option is A soluble in $HN{O}_3$

The nitrogen dioxide $\left(N{O}_2\right)$ remains dissolved in the nitric acid coloring it yellow or even red at higher temperatures. While the pure acid tends to give off white fumes when exposed to air, acid with dissolved nitrogen dioxide gives off reddish-brown vapors, leading to the common name "red fuming acid" or "fuming nitric acid".Hence nitrogen dioxide is soluble in water.