can i install mac lion on an hp core i3 laptp having windows 7

Yes and no. Apple systems used to have additional hardware such that it is difficult to install their software on non-Apple gear. Here is a link to help you do this: http://www.redmondpie.com/how-to-install-os-x-mountain-lion-hackintosh-on-a-pc-tutorial/

Do note the salient point 3:

Requirements:

1. Access to a Mac to download OS X Mountain Lion from App Store and prepare UniBeast USB Drive.
2. A minimum of 8GB or larger USB flash drive.
3. A PC capable of running OS X Mountain Lion.

Have fun, and good luck.

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