Indicate the pair in which the chemical formulas of solids are given a) F2, O2 b) Cl2, NaCl c) I2P4 d) Br2, K2SO4

Pair c) I2 P4 is the only one in which the listed substances under normal conditions (25 degrees, 760 mm Hg) are solid (with the proviso that iodine crystals can simultaneously pass from a solid state to a gaseous state, sublimate into a violet gas, in including at low temperatures). Of the rest of the vapor, the first is fluorine and oxygen gases, from the second chlorine is gaseous, NaCl is crystals of ordinary table salt, in the fourth bromine is a liquid that freezes at a lower temperature (-7 degrees).

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