We all know that fajr, majrib, and isha are aloud. but my question is why are dhur and asr silent??
The question has been closed for the following reason "The question is answered, right answer was accepted" by a_mohammed Jun 29 '13 at 05:05
The following is taken from Qur’an Sunnah.com:
What is the reason why Qur’an is recited out loud in some prayers and silently in others?
Reciting out loud in the prayers in which the Prophet (peace and blessings of Allah be upon him) recited out loud, and silently in the prayers in which he recited silently, is one of the Sunnahs of prayer, not one of the obligatory duties. But it is better for the worshipper not to go against the Sunnah of the Prophet (peace and blessings of Allah be upon him).
The scholars of the Standing Committee were asked:
Why do we pray Zuhr and ‘Asr silently and Maghrib and ‘Isha’ out loud?
We do that following the example of the Prophet (peace and blessings of Allah be upon him). We recite silently in the prayers in which he recited silently, and we recite out loud in the prayers in which he recited out loud, because Allah says (interpretation of the meaning):
“Indeed in the Messenger of Allah (Muhammad) you have a good example to follow” [al-Ahzaab 33:21]
And the Prophet (peace and blessings of Allah be upon him) said: “Pray as you have seen me praying.” Narrated by al-Bukhaari in his Saheeh.
Fataawa al-Lajnah al-Daa’imah, 6/394, 395
Shaykh ‘Abd al-‘Azeez ibn Baaz was asked:
Why is it prescribed to recite out loud in Maghrib, ‘Isha’ and Fajr, and not in the other obligatory prayers? What is the evidence for that?
Allah knows best the reason why it is prescribed to recite out loud in those prayers. The most likely reason – and Allah knows best – is that at night and at the time of Fajr prayer, people are more likely to benefit from recitation that is done out loud, as there are less distractions around them than at the time of Zuhr and ‘Asr. End quote.
Majmoo’ Fataawa al-Shaykh Ibn Baaz (11/122)
Hope this helps.