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    				| 1. | 
                                    {:("i. Group 18",,"(a) Main group elements"),("ii. Group 3-12",,"(b) Noble gases"),("iii. Group 13-18",,"(c) Halogens"),("iv. Group 17",,"(d) Transition elements"):} | 
                            
| Answer» SOLUTION :i-b, ii-d, iii-a, iv-c | |