When 1 mole of a substance `(X)` was treated with an excess of water, 2 moles of readily combustible gas were produced along wit

When 1 mole of a substance `(X)` was treated with an excess of water, 2 moles of readily combustible gas were produced along with solution which when reacted with `CO_(2)` gas produced a white turbidity. The substance `(X)` could be
A. `Ca`
B. `CaH_(2)`
C. `Ca(OH)_(2)`
D. `Ca(NO_(3))_(2)`

When 1 mole of a substance `(X)` was treated with an excess of water, 2 moles of readily combustible gas were produced along with solution which when

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