MCQ
निम्नलिखित में कौन सही है?
- A$Na _2 CO _3 \cdot 5H _2 O$
- B$Na _2 CO _3 \cdot 10H _2 O$
- C$Na _2 CO _3 \cdot 7H _2 O$
- D$Na _2 CO _3 \cdot 2H _2 O$
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