A) Water
B) Air
C) Heat energy
D) Both (a) and (b)
Correct Answer: D
Solution :
\[\text{2F+}\underset{(\text{Air)}}{\overset{{}}{\mathop{\text{3/2}{{\text{O}}_{\text{2}}}}}}\,+\underset{\text{(water)}}{\overset{{}}{\mathop{x{{H}_{2}}O}}}\,\xrightarrow{{}}F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\]
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