No.
It is not a mixture but a compound of hydrogen and oxygen. We call this compound water.
Antimony (Sb) is a chemical element, not a mixture or compound.
Alcohol is a chemical compound, not a mixture.
If something is not a mixture then it is a pure substance, either an element or a compound.
Nickel is neither a compound nor a mixture, but a chemical element.
A salt is a chemical compound.
Sugar is a chemical compound.
It is a homogenous mixture
Oxygen is a chemical compound, not a mixture.
Ammonia (NH3) is a chemical compound not a mixture.
Copper sulfate is a chemical compound.
Acetylene is not a mixture. This is a form of chemical compound which is known as ethyne and has the chemical formula C2H2.