The iron nail displaces the Cu from the copper sulfate solution. This results in the color of CuSO4's disappearance. Copper is less reactive than iron.
Add a nail in CuSO4 Sodium, the color of CuSO4 disappears because iron (Fe) is more reactive than the copper (Cu). Hence, it replaces copper. The color of copper sulphate (CuSO4) is blue but when iron (Fe) replaces its place, it becomes iron sulphate (FeSO4) which is the light green color.
When we add an iron nail in copper sulfate solution (CuSO4) the reaction takes place between them which is as Fe+CuSO4->FeSO4+Cu. Due to more reactivity of iron, replacement happens and FeSO4 forms which is light green in color. Therefore, in this reaction color changes from blue to green.
In order for the molecule to change phase from liquid to gas and evaporates, it needs to overcome the force from other molecules around it. as the force bigger evaporation gets harder. so e has the highest force and higher boiling point.
One mole of copper equals 6.02 × 10^23 atoms. The answer is letter C. This follows the
Avogaro’s law wherein 1 mole of a substance is equal to 6.02 x 10^23 atoms,
formula units or molecules. This is applicable to all substances.
