A $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}^{573\,K}} $ Red phosphorus $\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{under\,pressure}^{heat\,;\,803\,K}} $$ B Red phosphorus is obtained by heating "A" at 573 K, and can be converted to "B" by heating at 803 K under pressure. A and B, respectively, are

Question

A $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}^{573\,K}} $ Red phosphorus $\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{under\,pressure}^{heat\,;\,803\,K}} $$ B

Red phosphorus is obtained by heating "A" at 573 K, and can be converted to "B" by heating at 803 K under pressure.

A and B, respectively, are

$\beta$-black phosphorus and white phosphorus.

white phosphorus and $\beta$-black phosphorus.

$\alpha$-black phosphorus and white phosphorus.

white phosphorus and $\alpha$-black phosphorus.

Solution

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