Element that liberates oxygen gas from water is

Which of the following liberates oxygen to from water

The element which liberated O_2 from water is

Oxygen is liberated from water using

Which of the following species is/are not liberating oxygen gas on reaction with water at 25^(@)C ?

Which of the following species is/are not liberating oxygen gas on reaction with water at 25^(@)C ?

Lithium, sodium potassium are all metals that react with water to liberate hydrogen gas is there any similarity in the atoms of these elements

An element reacts with hydrogen to form a compound A which on treatment with water liberates hydrogen gas. The element can be