Answer: The correct answer is arrow number 5.
Step-by-step explanation:
When an liquid silver is poured into a mold and cools down to become solid bar is a transition in which liquid phase is converting into solid phase which is termed as solidification represented by arrow number 5.
Where as other arrows represent:
Arrow 1 represent the vaporization process where liquid state changes to gaseous state.
Arrow 2 represent the Fusion process where solid state changes to liquid state.
Arrow 3 represent the sublimation process where solid state changes to gaseous state by escaping liquid state.
Arrow 4 represent the condensation process where gaseous state changes to liquid state.
Arrow 6 represent the deposition process where gaseous state changes to solid state by escaping liquid state.