The substances in order of increasing vapor pressure NF₃ NH₃ BCl₃ is NH₃< NF₃ < BCl₃. The correct option is A.
What is vapor pressure?
The pressure is exerted by a vapor in thermodynamic equilibrium with the developing close (solid or liquid) in a closed system at a given temperature is referred to as vapor pressure (or equilibrium vapor pressure).
Vapor pressure can be calculated by Clausius-Clapeyron equation.
Thus, the correct option is A, NH₃< NF₃ < BCl₃.
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