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In the element table is the left column with Hydrogen at the top, and column of metals.
If you take any oxidized metal and melt it, you get the metal oxide in liquid form.
The oxygen does not separate from this liquid form,
if you dont add oxygen-reducing substances, that take the oxygen from the metal,
to be able to get the pure metal.

So if you, for example, melt iron rust you get a liquid metal oxid.

Now...... 

If you google Hydrogen, there are discussions about whether Hydrogen is a metal or not.
Is Hydrogen a metal or what is Hydrogen?

If Hydrogen is a metal.
Can one then say that water is a   liquid metal oxide or a   liquid metal rust ?

MagI

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14 minutes ago, jlivingstonsg said:

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In the element table is the left column with Hydrogen at the top, and column of metals.
If you take any oxidized metal and melt it, you get the metal oxide in liquid form.
The oxygen does not separate from this liquid form,
if you dont add oxygen-reducing substances, that take the oxygen from the metal,
to be able to get the pure metal.

So if you, for example, melt iron rust you get a liquid metal oxid.

Now...... 

If you google Hydrogen, there are discussions about whether Hydrogen is a metal or not.
Is Hydrogen a metal or what is Hydrogen?

If Hydrogen is a metal.
Can one then say that water is a   liquid metal oxide or a   liquid metal rust ?

MagI

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Hydrogen is not a metal at normal temperatures and pressures. It has been predicted to be metallic under tremendous pressure, but so far no one has been able to demonstrate this reliably.

There is something that runs through the Periodic Table known as the "metal/non-metal diagonal". This cuts through the p-block, but if you extend it to the top left, it would cut through the s-block too. So it is not necessarily the case that because H sits in the s-block it has to be a metal. After all, some versions of the Periodic Table also place He in the s-block.

Essentially, the ionisation energy of hydrogen is too high (i.e. the electron in the 1s shell is too tightly bound) for it to be metallic.