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  4. Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K ?

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Q. Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at $803 \,K$ ?

JEE MainJEE Main 2021The p-Block Elements - Part2

Solution:

When red phosphorus is heated in a sealed tube at $803\, K$, $\alpha$-black phosphorus is formed.