State-owned ONGC and Oil India Ltd today bought 10 per cent government stake in Indian Oil Corporation for 5,340 crore rupees.The stake sale has doubled government's disinvestment proceeds for the current fiscal to 10,434 crore rupees.ONGC Chairman Dinesk K Sarraf confirmed his company's buying 12.135 crore government shares in IOC at 220 rupees per share.