A std took 2-3 grams a sustance x in a glass beaker and poured watrr in it slowly he observed bubbles with hissing sound the beaker becomes a quiet hot mention the reaction and name the type of reaction
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The element X is calcium (Ca).
Ca react with cold water to give hydrogen gas and produces heat , this type of reaction is called as exothermic reaction.
Ca + 2H2O----->Ca(OH)2+ H2+ Heat
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