g Which of the following describe chemical properties of hydrogen gas (H2)? At room temperature its density is less than any other gas. It reacts vigorously with oxygen to form water. Liquefied H2 boils at a very low temperature (-253oC). Both b and c are chemical properties.

It reacts vigorously with oxygen to form water.

Explanation:

Physical property is defined as the property of a substance which becomes evident during physical changes.

Example:  At room temperature its density is less than any other gas.

Liquefied boils at a very low temperature  

Chemical property is defined as the property of a substance which becomes evident during chemical changes. These properties are defined when  a substance undergo changes in bonding of atoms.

Example:  It reacts vigorously with oxygen to form water.

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b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.