The D and F element

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

Al ✘ Zn ✘ Ni ✘ Fe ✔ NULL ✔ NULL NULL

Suddenly cooling molten Zn ✘ Adding molten Zn to water ✘ Heating Zn 100 to 150C ✘ Dropping molten Zn drop by drop ✔ NULL ✔ NULL NULL

5-orbital ✘ 4-orbital ✘ 3-orbital ✘ 2-orbital ✔ NULL ✔ NULL NULL

Limonite ✘ Siderite ✘ Carnallite ✘ Chalcopyrites ✔ NULL ✔ NULL NULL

Cast iron ✘ Pig form ✘ Wrought iron ✘ Steel ✔ NULL ✔ NULL NULL

Pd ✘ K ✘ Al ✘ Zn ✔ NULL ✔ NULL NULL

Haematite ✘ Limonite ✘ Magnetite ✘ Siderite ✔ NULL ✔ NULL NULL

Heating it in the current of ✘ Fusing it with sand ✘ Treating with carbon monoxide ✘ Fusing it with ✔ NULL ✔ NULL NULL

Transition elements have low melting points. ✘ Transition elements do not have catalytic activity. ✘ Transition elements exhibit variable oxidation states. ✘ Transition elements show inert pair effect. ✔ NULL ✔ NULL NULL