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| Q.10 | In which year did Langmuir reform the Lewis concept by abandoning the idea of a stable cubical arrangement of the octet and introducing the term ‘covalent bond’? | |
| Ans | 1. 1915 | |
| 2. 1919 | ||
| 3. 1921 | ||
| 4. 1917 |
Correct Ans Provided: 2
