Reading first 10 ayah in salat

Assalamualaikum brothers and sisters hope you are all fine. my *first question* is i like to read my prayer(namaz) some times little longer so after **al-fatiha** i recite first **10 verses of al-bakrah** or **mulkh** or **al- imran**. Is this correct. Can i stop at first 10 verses ? My *second question* is in zohar(fard) prayer in first rakath i tell **al-fatiha** with 10 verses of **al- kahf**. In second rakath i tell **al-fatiha** with 10 verses of **al- imran**. Is this correct? My *third question* is in third and fourth rakath i also say some small surahs. Is it ok.