During a National Emergency under Article 352, Parliament can legislate on subjects in the State List under Article ______, and such laws cease to operate 6 months after Emergency ceases, except for things done/omitted before expiry.

Article 250 legislative powers during Emergency: (a) Constitutional provision: During Emergency, Parliament can legislate on any matter in State List, (b) Duration: Laws made under Article 250 cease to operate 6 months after Emergency ceases, except for things done/omitted before expiry, (c) Rationale: Enable unified national response to existential threats (war, external aggression, armed rebellion) while preserving State legislative domain post-crisis, (d) Applications: (i) 1962, 1971 Emergencies: Parliament legislated on defence, security matters affecting States, (ii) Post-Emergency: Laws ceased after 6 months unless re-enacted by Parliament/State Legislatures, (e) Federal balance: Temporary enhancement of Union legislative power for crisis management, reversible post-Emergency to restore federal normalcy, (f) Illustrates adaptive federalism: Enabling coordinated national response to existential threats while preserving State autonomy through time limits, sunset provisions.