How many types of emergencies have been envisaged under the Indian Constitution?

Which one of the following Articles of the Indian Constitution has not so far been used?

Which Article of the Indian Constitution deals with the proclamation of Emergency ?

Which one of the following is not mentioned as a form of Emergency in the Constitution of India?

Under which Article of the Indian Constitution President’s Rule can be imposed in a State?

How many times has Financial Emergency been declared in India so far?