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Which of the following is used to increase the antiknocking property of petrol?
When a spoon is to be electroplated with nickel the spoon is
Which one of the following contributes largely to the greenhouse effect?
The total energy of revolving electron in an atom
The electronic configuration of an atom having atomic number 20 is
Bakelite is a copolymer of Phenol and
Ozone layer is present in
Mercury is a :
Which one of the following elements is used in the manufacture of fertilizers?
Find the odd one:
