Nitrous Acid

Q. Which among the following oxides can yield Nitric acid on hydrolysis?

1. 
2. 
3. 
4. 

Q. Among the following oxides, the correct order of acidity is:

1. > > >
2. > > >
3. > > >
4. < < <

Q. Concentrated $HN{O}_3,$ upon long standing, turns yellow-brown due to the formation of
(IIT-JEE, 2012)

1. NO
2. $N{O}_2$
3. $N_{2}O$
4. $N_2{O}_4$

Q. The strength of the oxyacids decreases in the following order

1. 
2. 
3. 
4. 

Q. The Ostwald process is used in the preparation of:

1. Nitric acid
2. Nitrous acid
3. Oleum
4. Sulfuric acid