The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to compound Y. X and Y, respectively, are:
and
and
and
and CaO
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According to NCERT answer would be option (1)
and 
but According to general Chemistry answer would be (3)
and 
Option 1)
Option 2)
and 
Option 3)
and 
Option 4)