Answers

  • Brainly User
2015-10-16T19:38:43+05:30
Because hydrogen combine with water and form pop sound.
i think ans.is none of these
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2015-10-16T19:47:52+05:30
It is an EXOTHERMIC REACTION  as when hydrogen gas  is brought near the burning splinter the reaction is below
2 H2(g)+O2 gives rise to 2 H2O(g)\+heat
as it produces heat it is an exothermic reaction
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