Question

# Which pressure is NOT standard pressure?

A
760 torr
B
1 atm
C
101.325 kPa
D
70 mm Hg

Solution

## The correct option is C $$70\ mm\ Hg$$Standard Pressure is $$1\ atm$$, $$101.3\ kPa$$ or $$760\ mmHg$$ or $$torr$$.STP is the standard conditions often used for measuring gas density and volume. At STP, 1 mole of any gas occupies 22.4 L.    $$1\quad atm =101325\quad Pa= 760\quad torr=760mm\quad Hg$$$$\therefore \quad 0.987\quad atm=101.325\quad KPa=760\quad torr=750mm\quad Hg$$$$\therefore \quad 70mm\ Hg$$ is not standard pressureHence, option D is correct.Chemistry

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