Which of the following is/are incorrect statement(s) for phosphine? (a) It is less basic than \(...

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Which of the following is/are incorrect statement(s) for phosphine?
(a) It is less basic than \( \mathrm{NH}_{3} \).
(b) It is less poisonous than \( \mathrm{NH}_{3} \).
(c) The solution of copper sulphate gives no precipitate with \( \mathrm{PH}_{3} \).
(d) Phosphine burns in air forming predominantly \( \mathrm{H}_{3} \mathrm{PO}_{4} \).
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