Question

State Dalton's law of partial pressures.

Answer 1

The Dalton’s law of partial pressure is the universal law applicable to the mixture of all types of gases that do not react chemically with each other but exist physically distinct.
The component gases, provided the gases do not react chemically with each other. 
The total pressure P exerted by the mixture of gases is:

P = PA+ PB + PC + PD + PE.