1) In Jamaat Salah if you did something that broke the jamaat but you did not know until end of salah – is that alright in terms of niyyat ? And also is that alright interms of reciting slow or loud for remaining dhikr do you need sajdah sahv

2) If you recite Sura hamd by mistake loudly in dhohr or vice versa slowly in Magrib do you need to recite sajdah sahv?

3) What if you recite Sura hamd and second Sura by mistake in Jamat Salah do you need sajdah sahv?

1- If you didn’t do something that invalidates individual prayer such as adding Rokoo, your prayer is valid

2- It is recommended

3- No