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) Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

2) The most malleable metal is

3) The hydronium ion is

4) The maximum number of isomers for an alkene with molecular formula C₄H₈ is

5) Zone refining is used for the purification of