10th Class Science Metals and Non-metals Question Bank 10th CBSE Science Metals and Non-metals

  • question_answer
      An element A reacts with water to form a compound B which is used in white-washing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved. [NCERT Exemplar]


                     A ? Ca; B ? Ca (OH)2; C ® CaO Ca(s) + 2H2O   ®  Ca (OH)2 (aq) + H2(g) Ca (OH)2   CaO + H2O

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