Nitric acid is generated by the action of sulfuric acid
onsodium nitrate. nitrous acid is prepared by the action
ofhydrochloric acid on sodium nitrate. why is nitrous acid
preparedin situ then obtained from the reagent itself.

Explanation:

Nitrous acid is prepared in situ from hydrochloric acid and sodium nitrate because it is a weak acid and unstable. It only exists in an aqueous solution.

Nitrous acid is an unstable acid which gets decompose into the water , nitrogen dioxide and nitrogen monoxide gas.

Whereas nitric acid is highly stable acid which can be easily prepared from its reagent and it can easily be stored for future use.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying