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3 to 5
6 to 8
0.01 to 0.25
0.5 to 1.5
The percentage of Nitrogen in Air is
The percentage of nitrogen present in ammonium sulphate is:
The percentage of oxygen in air is approximately
The pH of human blood is between:
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