A gas which exists in three allotropic forms | vedclass

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(B) $SO_3$ exists in three allotropic forms:$a$) $\alpha-SO_3$: It forms long,transparent,ice-like crystals. The melting point of this form is $17^{\c

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$SO_3$

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(B) $SO_3$ exists in three allotropic forms:$a$) $\alpha-SO_3$: It forms long,transparent,ice-like crystals. The melting point of this form is $17^{\circ} C$.$b$) $\beta-SO_3$: It forms needle-like,silky white crystals. It melts at $32.5^{\circ} C$. Above $50^{\circ} C$,it changes to the $\alpha$-form.$c$) $\gamma-SO_3$: It is similar to the $\beta$-form and is obtained by completely drying $\beta-SO_3$. It melts at $62.2^{\circ} C$ under $2$ atmospheric pressure.

$A$ gas which exists in three allotropic forms $\alpha$,$\beta$ and $\gamma$ is

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