A solution of a substance ‘X’ is used for white washing.(i) Name the substance ‘X’ and write its formula.(ii) Write the reaction of the substance ‘X’ named in (i) above with water.

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NCERT Solution for Class 10 Science Chapter 1

Q. A solution of a substance ‘X’ is used for white washing.
(i) Name the substance ‘X’ and write its formula.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water.

Answer:-
(i) The substance whose solution in water is used for white washing is calcium oxide (or quick lime). Its formula is CaO.
(ii) CaO(s)  + H2O (l) —  Ca(OH)2
      

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