Select correct statement(s) is/are : (a) In \( \mathrm{AsH}_{3} \) molecule lone pair at central...

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Select correct statement(s) is/are :
(a) In \( \mathrm{AsH}_{3} \) molecule lone pair at central atom is present in almost pure \( s \)-orbital
(b) Number of \( p \pi-d \pi \) bond in \( \mathrm{SO}_{3} \) and \( \mathrm{SO}_{2} \) are same
(c) \( \mathrm{NF}_{3} \) is better Lewis base than \( \mathrm{NCl}_{3} \)
(d) Stable oxidation state of Lead is \( +2 \)
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