Question

Same volume of hydrogen and oxygen at the same temperature and pressure are mixed together so that the volume of the mixture is same as the initial volume of the either gas If the initial pressure be $p$, then the pressure of the mixture will be:

• A. $4p$
• B. $2p$
• C. $p/2$
• D. $p/4$

Answer 1

The correct option is B $2p$

Here we use the concept of "Dalton's law of partial pressures".

$P_{total}=P_{gas1}+P_{gas2}+......$

$\therefore ,P_{mixture}=P_{oxygen}+P_{hydrogen}$

$=P+P$

$=2P$