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

2 : 16 : 1
1 : 16 : 2
2 : 16 : 2
1 : 1 : 1

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Chemistry
Atoms of different elements have

Different atomic number and same eletronic configu-ration
Different atomic number and different number of valence electrons
Same atomic number and same electronic configuration
Same number of electrons and neutrons

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