ଧୋଇବା ସୋଡାର ରାସାୟନିକ ସୂତ୍ର ହେଉଛି _______ । 

1
Na 2 CO 3 10H 2 O
2
Ca (OH) 2
3
Na 2 SO 4
4
NaHCO 3

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