Fe + 3NaBr → FeBr3 + 3Na
The Na is replaced by the Fe atom.
Heat transfer is the phenomenon that occurs when the two objects are in the vicinity of each other and by increasing the area of their contact. Thus, option B is correct.
<h3>What is heat transfer?</h3>
Heat transfer is a process that flows the heat from one system to another, and is because of the difference in the temperature of the two objects that are part of the system.
The methods like conduction, convection, and radiation transfer the heat from the surface area to the other object. The heat gets transferred from the area of high to the low temperature.
Therefore, option B. by increasing the surface area the heat transfer increases.
Learn more about heat transfer here:
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Manipulation of the independent variable should change the dependent variable, the value of which "depends" on the independent variable's change in value.
Answer: E. none of these
Explanation: because the f-block element is n-2