9. The following statement shows the characteristics of a metal. Pernyataan berikut menunjukkan ciri-ciri suatu logam.
- Able to form complex ion
Berupaya membentuk ion kompleks - Can be used as a catalyst
Boleh digunakan sebagai mangkin
Which of the following metals has the above characteristics?
Antara logam berikut, yang manakah mempunyai ciri-ciri di atas?
A. Sodium
Natrium
B. Barium
Barium
C. Calcium
Kalsium
D. Iron
Ferum
Key hint here is formation of complex ion, which is only reserved for Transition elements. In this case, only Iron is a suitable solution.
Besides, you should have knowledge that iron is used as a catalyst in Haber process to produce ammonia.
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Ohhh ya Transition elements Thank you very much 
