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Why is sparkless electricity required fo...

Why is sparkless electricity required for the preparation of ozone? What do you mean by pseudohalogen?

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First part: NA
Second part: A binary inorganic compound with similar structure and chemical behavior to that of the halogens is known as pseudohalogen.
`p^0`=vapour pressure of pure water =23.55mm.
p=vapour pressure of solution
`x_2`= mole fruction of urea
`=(0.1)/(5.56+0.1)`
=0.0177
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