Power of Attorney

u can give specific power of attorney to sell ur property which will automatically expire after the property has been sold by the power holder. Don't give general power of attorney since u will hv to give a public notice to cancel the same. Also, if u wish u can include clauses like presenting the document for registration, and other procedures in revenue offices. There is no chance of cheating in specific power of attorney since it comes to an end when the specipic purpose is achived.

If I may be permitted to put a supplementary question to the query asked-

If a person is given a general power of attorney for a piece of vacant land and he subsequently builds a house on it, does it mean that the original owner can take that away any time he pleases?

Also, if a situation for compensation (say, from the government) arises, then who is entitled to the same?

Please go through the provisions of Sec. 33 of the Registration Act and the Power of Attorney Act. 

Also go through Sec. 85 of the Act.