30 H g O g 0 0 H O H O AH X4 Given EH HX Eo o EO HX AH of H
Last updated: 6/30/2023
30 H g O g 0 0 H O H O AH X4 Given EH HX Eo o EO HX AH of H O vapour is 2 2xg X 22 X4 4 X 2 2xy x4 31 A cylinder contains either ethylene or propylene 12 ml of gas required 54 ml of oxygen for complete combustion The gas is 1 Ethylene 2 Propylene 3 1 1 mixture of two gases 4 1 2 mixture 32 The specific heat of a gas is found to be 0 075 calories at constant volume and its formula wt is 40 The atomicity of the gas would be 1 One 3 Three 2 Two 4 Four 33 H g O g 0 H g AH for this reaction is 1 Heat of formation of O H 2 Bond energy of O H 3 Heat of combustion of H 4 Zero at all temperatures 34 Energy required to dissociate 4 g of gaseous H into free gaseous atoms is 872 kJ at 25 C The bond energy of H H bond will be 1 8 72 kJ 3 436 kJ 2 4 36 kJ 4 43 6 kJ 35 The dissociation energy of CH g is 360 kcal mol and that of C H g is 620 kcal mot The C C bond energy 1 260 kcal mol 1 3 130 kcal mol 36 The enthalpy of reaction 2 180 kcal molt 4 80 kcal mol 1 8s 41 4p q 5r 2 4p 2q 5r 85 41 3 4p 2q 5r 8s 4t 4 2p q 5r 8s 41 37 Using bond energy data calculate heat of formation of isoprene 5C s 4H 9 H C C CH CH CH Given C H H H C C C C and C s C g respectively as 98 8 kcal 104 kcal 83 kcal 147 kcal 171 kcal 42 1 21 kcal 3 40 kcal 38 In a flask colourless N O is in equilibrium with brown coloured NO At equilibrium when the flask is heated at 100 the brown colour deepens and on cooling it becomes less coloured The change in enthalpy AH for formation of NO is 1 Negative 2 Positive 4 Undefined 3 Zero 39 For which of these reactions will there be AS positive 2 21 kcal 4 50 kcal 1 H O g H O 1 2 H g g 2HI g 3 CaCO s CaO s CO 4 N g 3H g 2NH g 40 For stretched rubber Entropy 1 Increases 2 First increases then decreases 3 Decreases 4 First decreases then increases 41 The least random state of H O is 1 Ice 2 Liquid water 3 Steam 4 Randomness is same in all AS for the reaction MgCO s MgO s CO g 1 Zero 2 ve 3 ve 4 43 The standard entropies of N g H g and NH g are 191 5 130 5 192 6 JK mol The value of AS of formation of ammonia is