PLEASE ANSWER FAST

Dear Student,
(A) Na2CO3 is used for the preparation of Borax (Na2B4O7)
      4H3BO3+Na2CO3Na2B4O7+6H2O+CO2
(B) Sodium carbonate (or washing soda) is employed as a cleansing agent for household purposes like laundry. Sodium carbonate is a component of many dry soap powders/detergents.
(D) Sodium carbonate is used to remove the permanent hardness of the water.
      Permanent hardness is due to Ca+2/ Mg+2 and Cl-/SO42-
     Na2CO3(aq) + CaCl2(aq)2NaCl(aq) + CaCO3(s) 

Option (C) is correct: Washing soda is not used for making toys and materials for decorations.

Regards
 

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