Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?
A.
When exposed to air, it slowy changes to liquid
B.
its solution in water conducts electricity
C.
Its solution in water, on evaporationm gives a white solid
D.
Its solution in water liberates hydroge when in contact with aluminium metal
E.
Its oxide, when stronlgy heated, regenerates the elements X
Correct Answer: Option E
Explanation
Identification of Element X: Element X has 19 electrons, identifying it as Potassium (K), an alkali metal in Group 1 of the periodic table.
Reaction with Oxygen: Potassium reacts with oxygen to form potassium oxide (K\(_2\)O).
Thermal Stability: Oxides of Group 1 metals like potassium are extremely stable due to their high lattice energy and the strong electropositive nature of the metal. They do not decompose back into the metal and oxygen simply by heating; instead, potassium is typically obtained through electrolysis.
K\(_2\)O).
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