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A characteristic shared by zinc and other transition elements is the ability to
have variable oxidation states
form complex ions
act as a catalyst
form coloured ions
The purest form of iron which contains only about 0.1% carbon is
pig iron
wrought iron
cast iron
iron pyrite
Which compound will give a brick‑red colour in a non‑luminous Bunsen flame?
LiCl
NaCl
CaCl2
MgCl2
Mineral acids are usually added to commercial hydrogen peroxide to
oxidize it
decompose it
minimize its decomposition
reduce it to water and oxygen
Commercial bleaching can be carried out using
sulphur (IV) oxide and ammonia
hydrogen sulphide and chlorine
chlorine and sulphur (IV) oxide
ammonia and chlorine
