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Question

An element X reacts fairly vigorously with cold water to form Y but hydrogen does not ignite


  1. X,Y and Z are Cu, Cu(OH)2 and CuCl2 respectively.

  2. X,Y and Z are Ca, Ca(OH)2 and CaCl2 respectively

  3. X,Y and Z are Na, NaOH and NaCl respectively

  4. X,Y and Z are K, KOH and KCl respectively


Solution

The correct option is B

X,Y and Z are Ca, Ca(OH)2 and CaCl2 respectively


Ca reacts fairly vigorously with cold water to form Y but hydrogen does not ignite.
Ca+2H2OCa(OH)2+H2

Ca(OH)2 then react with dil.HCl to form CaCl2

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