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Calculate the following: The volume & ...

Calculate the following:
The volume & number of moles of oxygen liberated at s.t.p. when 5.2 gm. of sodium peroxide `[Na_2 O]` reacts with water. `2Na_2 O_2 + 2H20 to 4NaOH + O_2 [Na=23, O=16]`

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ICSE-MODEL PAPER -1-SECTION -II
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