In Advaita Vedanta, Nirguna Brahman is seen to be devoid of all qualities and hence, impersonal/formless. Is Nirguna Brahman in Vishishtadvaita impersonal/formless?
Nirguna Brahman of Advaita does not exist according to Vishishtadvaita.
The Advaitins may say that, when they say that consciousness is eternal, they do not refer to consciousness limited by objects like pot etc but to pure Consciousness unlimited by objects. Such pure Consciousness devoid of all objects does not exist, for it is not experienced.
Brahma Sutra Sri Bhasya of Sri Ramanuja 1.1.1 The Great Siddhanta Advaita Position Refuted translated by Swami Vireshwarananda and Swami Adidevananda