Question

Nitric acid is colourless but on storing for long time it becomes yellowish

Answer 1

This is due to the formation of nitrogen dioxide.

The acid takes nascent oxygen from the atmosphere and forms NO2

This gas is like reddish brown fumes

And hence changes the colour of acid.

Please mark as brainliest

Answer 2

Na mg Al si p, s, Ci which is bigger absolutely na and mg identify that iit is metallic and amp etc.

of course no metallic ok