Match the industrial plant with its location.
| Industrial plant | Location |
| 1. BALCO | A. Burnpur |
| 2. IISCO | B. Chennai |
| 2. NFL | C. Korba |
| 4. ICF | D. Bhatinda |
1-A,2-B,3-C,4-D
1-C,2-A,3-B,4-D
1-C,2-A,3-D,4-B
1-D,2-A,3-B,4-C
Identify the correct chemical formula of chloroform.
In India census is held regularly every __________ year.