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4.5-5
8-9
7.5-8
6.5-7
The pH of lemon juice is expected to be
The pollutant responsible for ozone holes is _
The polymer obtained by the condensation of hexamethylene diamine and adipic acid is :
The polymer used in making plastic crockery is
The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
The process of improving the quality of rubber by heating it with sulphur is called
The process of removing calcium and magnesium from hard water is known as
The process which does not evolve CO2 in air is
The purest form of iron is
The purest form of water in nature is