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The following are some statements related to groups 15 hydrides :
(i) reducing nature increases from \( \mathrm{NH}_{3} \) to \( \mathrm{BiH}_{3} \)
(ii) tendency to give lone pair of electrons decreases from \( \mathrm{NH}_{3} \) to \( \mathrm{BiH}_{3} \)
(iii) thermal stability decreases from \( \mathrm{NH}_{3} \) to \( \mathrm{BiH}_{3} \)
(iv) bond angle decreases from \( \mathrm{NH}_{3} \) to \( \mathrm{BiH}_{3} \) The correct statements are :
(A) (i) and (iv)
(B) (i), (ii) and (iii)
(C) (i), (ii) and (iv)
(D) (i), (ii), (iii) and (iv)
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