MCQ
धावन सोडे का सूत्र है :-
- A$Na _2 CO _3 .7 H _2 O$
- ✓$Na _2 CO _3 \cdot 10 H _2 O$
- C$Na _2 CO _3 .3 H _2 O$
- D$Na _2 CO _3$
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$A$ (मुख्य रूप से) है: