A) become double of 740 mm
B) become half of 740 mm
C) become 1/9 of 740 mm
D) remains unchanged
Correct Answer: B
Solution :
According to Dalton's law of partial pressure as number of moles of \[{{O}_{2}}\] and \[{{H}_{2}}\]are same \[\Rightarrow \] \[{{p}_{{{O}_{2}}}}={{p}_{{{H}_{2}}}}=p\] Total pressure \[P={{p}_{{{O}_{2}}}}+{{p}_{{{H}_{2}}}}=2p\] \[p=\frac{P}{2}=\frac{740\,mm}{2}=370\,mm\] The pressure of \[{{\text{H}}_{\text{2}}}\] gas is 370 mm NOTE: In a mixture of gases partial pressure of any gas is independent of the pressure exerted by other gases and the total pressure of the mixture is equal to the sum of partial pressure of all the gases present.
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