Which of the following are not known? (a) \( \mathrm{PH}_{5} \) (b) \( \mathrm{PI}_{5} \) (c) \(...

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Which of the following are not known?
(a) \( \mathrm{PH}_{5} \)
(b) \( \mathrm{PI}_{5} \)
(c) \( \mathrm{NCl}_{5} \)
(d) All of these
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