Question

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)`

Answer 1

Correct Answer - B
`underset((X))(CaH_(2))+2H_(2)O rarr underset("White turbidity")(Ca(OH)_(2)+2H_(2))overset(+O_(2))rarr CaCO_(2)+H_(2)O`