In وَأَمَّا مَنْ خَفَّتْ, sākin nūn meets khāʾ, one of the throat letters. Thus the rule is iẓhār ḥalqī, not ikhfāʾ.
Compare:
مَنْ ثَقُلَتْ — thāʾ: ikhfāʾ.
مَنْ خَفَّتْ — khāʾ: iẓhār.
Read them alternately. The following letter, not merely the presence of nūn, determines the ruling.
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Clear nūn before khāʾ
Al-Qāriʿah and Az-Zalzalah — Comparative Tajwīd Practice
In وَأَمَّا مَنْ خَفَّتْ, sākin nūn meets khāʾ, one of the throat letters. Thus the rule is iẓhār ḥalqī, not ikhfāʾ.
Compare:
مَنْ ثَقُلَتْ — thāʾ: ikhfāʾ.
مَنْ خَفَّتْ — khāʾ: iẓhār.
Read them alternately. The following letter, not merely the presence of nūn, determines the ruling.