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Carbon dioxide
Nitrogen
Ozone
Oxygen
The ammonium ion is
The amount of chlorine available in water after disinfection is called as
The anode in a dry cell consists of
The anode of a dry cell is made up of
The antiseptic compound present in dettol is
The atmospheric gas that is mainly responsible for Green House effect:
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?
The atoms of the elements having same mass number but different atomic number are called
The atoms of the elements which have same number of neutrons are called
The biogas used for cooking is a mixture of which of the following