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O3 and N2
O2 and N2
Oxides of N and S
O2 and O3
The strongest oxidizing agent among the following is
The substance coated on plastic tape recorder tapes is
The substance most commonly used as a food preservative is
The substance that cannot be used as an insecticide is
The substance that is added to make natural rubber strong & more bouncy is
The substance that is least prone to catch and spread fire is
The temperature of oxy-acetylene flame is around
The term meaning copper demon denotes the metallic element
The third shell of an atom can have a maximum of _ electrons.
The three elements most needed in common fertilisers are: