The octane number of zero is assigned to

The octane number of zero is assigned to

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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

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3) The high reactivity of fluorine is due to

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

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