Hydrogen and nitrogen combine to produce ammonia. $\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3$ Which of the following statements is correct?
- AAmmonia is made in industry by the Contact process.
- BAmmonia is used in industry to make hydrogen and nitrogen.
- CHydrogen, for the forward reaction, is obtained from cracking oil.
- DWeed killers are manufactured from ammonia.