1. 120g of an organic compound that contains only carbon and hydrogen gives 330g of CO2 and 270g of water on complete combustion. The percentage of carbon and hydrogen, respectively are (a) 25 and 75 2. (b) 40 and 60 (c) 60 and 40 (d) 75 and 25 The energy of one mole of photons of radiation of wavelength 300nm is (Given: h = 6.63 1034 Js,NA = 6.02 1023 mol c = 3 10 ms) (a) 235 kJ mol 3. The correct order of bond orders of (b) 325 kJ mol CN and O (c) 399 kJ mol (d) 435 kJ mol is, respectively (a) <