Decrease in vapour pressure will cause? A. an increase in boiling point
B. a decrease in boiling point
C. no effect

A. an increase in boiling point

Explanation:

A decrease in vapor pressure will cause an increase in the boiling point of a substance.

An increase in vapor pressure will decrease the boiling point.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.