Which of the following refrigerants contains chlorine?
a. r-22
b. r-134a
c. r-410a
d. r-1234yf

R-22 contains chlorine.

Explanation:

The refrigerant R22 is mainly used for the heat absorption and removal from the space. The main application that uses this refrigerant are heat pumps, car AC, refrigerating machines, central AC, etc. It can also be referred as hydrochlorofluorocarbon 22 or HCFC 22.

Hydrogen, fluorine, carbon and chlorine are the main ingredients that is present in HCFC refrigerants.In the refrigerants like,  R-123 and r-22, the potential of ozone depletion is more than 0. The presence of chlorine is more in chlorofluorocarbon(CFC). R12 is a CFC refrigerant. The refrigerants that do not contain any chlorine are  R-134a, R-410A. refrigerants have an ozone  depletion potential of more than zero .

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.