O-LevelChemistryMetals & Reactivity5070/12 · May/June 2023 · Q271 Mark
The table shows some properties of transition elements and the reasons why they have these properties. Which row shows a correct property and the reason why transition elements show this property?
Airon has two common oxidation states (I) and (II); iron atoms can lose one or two electrons to form compounds
Bnickel can be used as a catalyst; the use of nickel raises the activation energy of the reaction
Cthe reaction of aqueous sodium hydroxide with the salt of a transition element can be used to identify the element; transition metal hydroxides are often coloured
Dtransition elements have high melting points; the presence of varying numbers of electrons in the 'sea' of delocalised electrons weakens the metallic lattice
✓ Correct answer
C: the reaction of aqueous sodium hydroxide with the salt of a transition element can be used to identify the element; transition metal hydroxides are often coloured
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