This is correct.

Is it true that we must say Ameen with the Imam loudly , so that if our Ameen coincides with that of the angels , our sins will be forgiven ?

Prayer | March 26, 2014 6:58 am
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If i come to a mosque during Maghreb, isha or Fajar prayer and find the jamaa’a has already concluded the congregational prayer and I have to pray alone, do I have to recite the quran (Qira’at) loudily or quietly?
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Yestarday I was praying asur,and to the second rakah I offer one salam due to lack of concentration ,immediately I realize my mistake and I stood up and I continue my prayer.Is this wrong?