MCQ
निम्न में कौन-सी अभिक्रिया उत्क्रमणीय है?
- A$N _2+3 H _2 \rightleftharpoons 2 NH _3$
- B$AgNO _3+ HCl \longrightarrow AgCl + HNO _3$
- C$CaCO _3 \longrightarrow CaO + CO _2$
- D$C + O _2 \longrightarrow CO _2$
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