The gas present in the stratosphere which filters out some of the sun s ultravio

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

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1) The graphite rods in the nuclear reactor

2) The hottest part of the gas flame is known as

3) The most electronegative element among the following is

4) The molecules of which gas have highest speed?

5) The method of concentrating the ore which makes use of the difference in density between ore and impurities is called