✅Answer: We know from the narrations that the recitation of the Zuhr prayer is generally done quietly. However, the following narration indicates that the Zuhr prayer on Friday is an exception:

مُحَمَّدُ بْنُ یَعْقُوبَ عَنْ عَلِیِّ بْنِ إِبْرَاهِیمَ عَنْ أَبِیهِ عَنِ ابْنِ أَبِی عُمَیْرٍ عَنْ حَمَّادٍ عَنِ الْحَلَبِیِّ قَالَ سَأَلْتُ أَبَا عَبْدِ اللَّهِ عَنِ الْقِرَاءَةِ فِی الْجُمُعَةِ إِذَا صَلَّیْتُ وَحْدِی أَرْبَعاً أَجْهَرُ بِالْقِرَاءَةِ فَقَالَ نَعَمْ وَ قَالَ اقْرَأْ سُورَةَ الْجُمُعَةِ وَ الْمُنَافِقِینَ فِی یَوْمِ الْجُمُعَةِ

📚Kafi, Vol. 3, p. 425

Translation: Al-Halabi said: I asked Imam al-Sadiq (AS) about reciting the Zuhr prayer on Friday, whether I should recite it loudly if I am praying alone or in four rak‘ahs. He replied: Yes, and he said: In the Zuhr prayer on Friday, recite Surah Al-Jumu‘ah and Surah Al-Munafiqoon.

Explanation: This means that in the first rak‘ah of the Zuhr prayer on Friday, after reciting Surah Al-Fatiha, recite Surah Al-Jumu‘ah, and in the second rak‘ah, after reciting Surah Al-Fatiha, recite Surah Al-Munafiqoon.