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When hydrolysis of white phosphorous is ...

When hydrolysis of white phosphorous is carried out in presence of `NaOH`, it give a rotten fish smell gas `A` and a salt `B`. When `B` is treated with dilute `HCl` it gives a oxyacid `C`. If atomicity of gas `A` is `X` and basicity of acid `C` is `Y` then find value of `X+Y`?

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