ANSWER: No need to take ghusl or to do wudhu as this was abrogated. 

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ANSWER: No problem. However, if they are junoob (major sexual impurity), its not permissible to recite the Quran.

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ANSWER: He must pray while sitting down with movements of his eyes if he cannot move at all and even without wudu due to necessity. 

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ANSWER: No. The time for making dua is in your last tashahhud, before making salam unless the imam prolongs sitting and you don’t have anything else to say.

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