The effect of the presence of impurities such as carbon and sulphur on iron is that they
give it high tensile strength
make it malleable and ductile
increase its melting point
lower its melting point
A few drops of concentrated HNO3 is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation presents are likely to be
Pb2+
Cu2+
Fe3+
Fe2+
The bleaching action of chlorine gas is effective due to the presence of
hydrogen chloride
water
air
oxygen
In the laboratory preparation of oxygen, dried oxygen is usually collected over
hydrochloric acid
mercury
calcium chloride
tetraoxosulphate (VI) acid
The property of concentrated H2SO4 that makes it suitable for preparing HNO3 is its
boiling point
density
oxidizing properties
dehydrating properties
