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Which one of the following has greater active mass?

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200 gm of lime stone in 2 lit vessel

90 gm of CS₂ liquid in 100 ml vessel

56 gm of N₂ gas in 0.5 lit vessel

1 mole of O₂ gas at STP

answer is C.

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Detailed Solution

(1) Lime stone is a solid. it's active mass = 1

(2) CS₂ is a liquid. it's active mass = 1

(3) Active mass of Nitrogen = Molarity =

(4) Active mass of Oxygen = Molarity =

1\times\frac{1}{22.4}=\;\frac{1}{22.4}=0.047\;M

Option (3) has maximum active mass.

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