$1 T O R R$ is equal to

1 m m

H g

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10 m m

H g

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0.5 m m

H g

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5 m m

H g

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Solution

The correct option is A $1 m m$ of $H g$
Torr is used as a unit of atmospheric pressure, after the name of scientist torricelli and 1torr is equal to 1mm of Hg, that is, it is equal to pressure below a 1mm long column of mercury.

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Convert 1 mm of Hg into pascal. Take density of Hg = 13.6 $\times 10^{3}$ kg $m^{- 3}$ and g= 9.8 m $s^{- 2}$ .

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What specific name can be given to the following sequence of steps: $H g + h v \to H g^{*}$

$H g^{*} + H_{2} \to H_{2}^{*} + H g$

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