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nitrogen
hydrogen
carbon dioxide
oxygen
Washing soda is the common name for
Quartz crystals normally used in quartz clocks etc. is chemically
Which of the gas is not known as green house gas ?
Bromine is a
The hardest substance available on earth is
Tetraethyl lead is used as
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing
The gases used in different types of welding would include
The property of a substance to absorb moisture from the air on exposure is called
The average salinity of seawater is