Question

can we get water by combining hydrogen and oxygen ​

Answer 1

Yes,
You can make water by simply adding hydrogen and oxygen. By the way, this is the simplest and straight way to make water but the first thing is that you have to supply some energy to the reaction (in form of heat) to start the reaction (activation energy).
Please note that it is a redox reaction. In the process the oxygen is reduced and hydrogen is oxidised. Or you can in simple words call it as burning of hydrogen so in order to start the reaction you will have to mix hydrogen and oxygen in the ratio 2:1 (by volume) and ignite it the rest process is an exothermic process. And the water is formed.

Please note that the burning of hydrogen is very different from burning of commercial fuel. Hydrogen burns rapidly
producing instantaneous heat which can be dangerous for you.

Answer 2

When molecular hydrogen (H2) and oxygen (O2) are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide. These two processes are represented by the two chemical equations shown at right. Chemists use redox half-reactions to describe thermodynamic processes like the ones embodied by such equations. For both of the reactions shown, the hydrogen molecules are oxidized and the oxygen atoms are reduced. Accordingly, each of the reactions below is described by a combination of two half-reactions--one corresponding to a chemical oxidation and another corresponding to a reduction.


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