The reaction $\mathrm{2NaHCO_3 + C_4H_6O_6 \rightarrow C_4H_4Na_2O_6 + 2CO_2 + 2H_2O}$ takes place during—

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baking of cake

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preparation of baking soda

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making vinegar

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soap making

The reaction 2NaHCO3+C4H6O6→C4H4Na2O6+2CO2+2H2O\mathrm{2NaHCO_3 + C_4H_6O_6 \rightarrow C_4H_4Na_2O_6 + 2CO_2 + 2H_2O}2NaHCO3​+C4​H6​O6​→C takes place during—