Question

1.Gases can be liquified by a]increasing pressure b]decreasing temperature c]both A and B d]decreasing pressure

Answer 1

gases are liquefied on low temperatures by applying high pressure.this process is called fractional distillation. all the gases are first compressed and brought into low temperatures, according to their melting point, the wud liquefy. example:- carbon dioxide gas liquefies at -78 degree Celsius
so the answer is B]