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| 1. |
The answer to each of the following questions is a single digit integer, ranging from 0 to 9. If the correct answers to the qustion numbers A,B,C and D (say) are 4,0,9 and 2 respectively, then the correct darkening of bubbles should be as shown on the side : The number of metals collectivelycalled 'platinum metals ' in the transiton elements is |
| Answer» Solution :The ELEMENTS of 2nd and 3RD triads of GROUPS 8,9 and 10 ( i.e., RU , Rh , Pd, OS, Ir, Pt) are collectivelycalledplatinum metals. | |