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(D) $1$. Arsenic,antimony,and bismuth are primarily found as sulphide minerals,so statement $A$ is incorrect.$2$. Holme's signals use calcium phosphid

Vedclass · Accepted Answer

Oxygen shows allotropy.

Vedclass · Answer

(D) $1$. Arsenic,antimony,and bismuth are primarily found as sulphide minerals,so statement $A$ is incorrect.$2$. Holme's signals use calcium phosphide $(Ca_3P_2)$ and calcium carbide $(CaC_2)$. When thrown into the sea,they produce phosphine $(PH_3)$,which undergoes spontaneous combustion. White phosphorus itself is not used directly in this manner,making statement $B$ incorrect.$3$. Polonium is a radioactive element and it does exhibit allotropy. Statement $C$ is incorrect.$4$. Oxygen exists in two allotropic forms: dioxygen $(O_2)$ and ozone $(O_3)$. Thus,statement $D$ is correct.

Choose the $CORRECT$ statement.

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