Question

answer batado bhai please

Answer 1

1)Magnesium and aluminium starts to corrorde that's it
2)Silver become black with passage of time because silver forms unporous film when reacting with oxygen.
3)It is the series of metal, where they are placed according to their reactivity.(It includes Oxidation metals & redox potential metals)

Answer 2

1)-
(a): {HCl reacts with Mg}
2HCl + 2Mg -------) 2MgCl + H2
magnesium chloride is produce and hydrogen gas evolved.
(b): {HCl reacts with Aluminium}
HCl + Al --------) AlCl + H2
Aluminiumchloride is produce and hydrogen gas evolved.

2)-Objects made of silver become black with the passage of time,this is because the object will later on reacts with moisture and air(O2) which causes blackish color.

3)- IT Is a series of metals which are placed in descending order according to their reactive nature.

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