Indian Politics
In Indian parliamentary functioning, "Zero Hour" means-

Time before question hour
Time immediately following question hour
Acceptance of privilege motion
First hour of the session

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Indian Politics
The parliament can legislate on the subject in the state list

if the Supreme Court of India gives authority to the Parliament of India in this regard
if the Rajya Sabha passes a resolution by two-third of its to legislate on a state matter in the nat
None of these
if the President issues an order authorizing it to do so

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