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On heating magnesium sulphate, the follo...

On heating magnesium sulphate, the following changes takes places:
`MgSO_(4).7H_(2)O overset( 150^(@)C) rarr MgSO_(4).xH_(2)O`
`overset (200^(@)C) rarr MgSO_(4). yH_(2)O`
the sum of x and y is :

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