Read the list of elements given below. F, Cl, Br, I

Which of the following about the elements is true?

A. All of them are highly reactive metals

B. All of them are highly reactive nonmetals

C. F and Cl are reactive nonmetals and Br and I are highly reactive metals

D. F and Cl are reactive metals and Br and I are highly reactive nonmetals​

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.