Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formula equation for this reaction?
F2(1) + Na(s) —> NaF2(s)
F2(g) + Ca(s) —> CaF2(1)
F2(g) + Na(s) 4 , NaF 20
F2(g) + Ca(s)
CaF2(5)

last option that is

F2(g) + Ca(s) —> CaF2 (s)

Explanation:

it had to be either 2nd or 4th bc the product to be obtained was Calcium Fluoride with molecular formula CaF2.

2nd couldn't be the answer as CaF2 isn't formed in liquid state but in solid state as given in option 4.

(l)/ (s)/ (g) represents the state of the substance ,I.e, if the substance is in liquid solid or gaseous state respectively.

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