C-07-Q109mediumsingle_mcqWashing soda used for washing clothes is chemically—aNaHCO3NaHCO_3NaHCO3bNa2CO3⋅10H2ONa_2CO_3 \cdot 10H_2ONa2CO3⋅10Hcanhydrous Na2CO3Na_2CO_3Na2CO3dNaOHNaOHNaOH