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A mixture of two gases, having partial p...

A mixture of two gases, having partial pressure `P_1` and `P_2` has total pressure P, then according to Dalton's law :

A

`P =P_1 + P_2`

B

`P = sqrt (P_1 + P_2)`

C

`P = P_1 xx P_2`

D

`P = (P_1 + P_2)/2`

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The correct Answer is:
A
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