(2)Nothing in clause (1) shall prevent the Union from imposing, or authorising the imposition of, any tax to such extent, if any, as Parliament may by law provide in respect of a trade or business of any kind carried on by, or on behalf of, the Government of a State, or any operations connected therewith, or any property used or occupied for the purposes of such trade or business, or any income accruing or arising in connection therewith.