A. iron turns to rust when it is exposed to oxygen :)
Constraints refers to demarcations of geometrical charecteristics between two or more entities or solid modeling bodies
Feo + 2H = H2O + Fe + 2 + CIO4-
this is ur answer. .
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The correct option is this: THE ATOMS IN THE SOLID WILL BE VIBRATING IN POSITION.
This is because the molecules in solids are held together by strong inter molecular forces, the molecules can not move about freely but they cab vibrate in their position.