Which choice contains a false statment? a. for the vaporization of liquid benzene δh is positive. b. for the formation of 1 mol nitrogen dioxide from its elements (heat is absorbed)δh is negative. c. for the sublimation of dry ice [conversion of co₂(s) directly to co₂(g)] δh is positive. d. for the reaction of 1 mol of sulfur dioxide with oxygen δh is negative. e. none of these is/are false

B is False

Explanation:

In physical chemistry we always look from system's perspective, so if we heat something ΔH is positive and if the system gives heat out then ΔH is negative.

A. We have to give energy to benzene to evaporate it. Statement true.

B. If heat is absorbed then the enthalpy must be positive.

C. The heat is absorbed then ΔH is positive.

D. Usually for burning heat is exposed from system. So enthalpy is negative.

E. Obvious

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.