All of the following substances react with water. The pair that gives the same gaseous product is
(a) K and KO₂
(b) Na and Na₂O₂
(c) Ca and CaH₂
(d) Ba and BaO₂
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answer is (c)
ca +h2o = ca(oH)2 + h2
cah2 + h2o = ca(oh)2 +h2
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