Which one among the following metals is not stored under oil ?

[amp_mcq option1=”Sodium” option2=”Rubidium” option3=”Potassium” option4=”Lithium” correct=”option4″]

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UPSC CDS-2 – 2024

Alkali metals (Group 1) are highly reactive and readily react with oxygen and moisture in the air. Sodium (Na), Potassium (K), and Rubidium (Rb) are particularly reactive and are stored under inert liquids like kerosene or mineral oil to prevent reactions with air and water. Lithium (Li), while also an alkali metal, is less reactive than Na, K, and Rb. It reacts readily with nitrogen in the air (unlike other alkali metals) but is less reactive with oxygen and water compared to the others. While it is often stored under oil or an inert atmosphere, it is sometimes the exception discussed when comparing storage methods due to its different reactivity profile. Among the given options, Lithium is the metal *least necessarily* stored under oil compared to the others, or has alternative common storage methods.

– Alkali metals are highly reactive.
– Storage under oil or inert atmosphere prevents reaction with air and moisture.
– Lithium’s reactivity and reaction products differ somewhat from heavier alkali metals.

The reactivity of alkali metals increases down the group. Potassium and Rubidium are more reactive than Sodium, which is more reactive than Lithium. Cesium (Cs) is even more reactive than Rubidium. These heavier alkali metals are often stored in evacuated glass ampoules or under inert gas rather than oil due to their extreme reactivity and lower melting points.

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