The most abundant rare gas in the atmosphere is
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1) The gas present in the stratosphere which filters out some of the sun s ultraviolet light and provides an effective shield against radiation damage to living things is
2) The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
3) The main use of salt in the diet is to
4) What are the number of moles of CO2 which contains 16 g of oxygen?
5) The mineral containing both magnesium and calcium is