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Photochemical reaction
Physical change
Endothermic reaction
Exothermic reaction
Commercial nitric acid is coloured as it contains dissolved:
Commercially, sodium bicarbonate is known as
Constantan is an alloy of copper and
Conversion of chemical energy into electrical energy occurs in
Cooking gas is a mixture of
Copper substances when exposed to air gains a green coating due to the formation of:
Covalent bonds are mainly found in
Cryolite is:
Currency coins are alloys of different metals. One metal that is present in all coins is
Diamond is harder than graphite because of :