Question

I don’t understand pleasssse help

Answer 1

Answer:

this is table of metals.

Explanation:

in first column of metal their three metals Nickel, iron, and lead and in second column there is the observation after leaving those metal in air water for one week so there is gradual change in iron that it makes Red Brown and flaky substance but in Nickel and in lead there is no change similarly in third column there is observation on adding dilute sulphuric acid so in Nickel Bubbles form slowly and in iron bubbles form more fast and in Lead there is no change .