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NAT I Engineering Chemistry
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | At 500 K the equilibrium constant for reaction cis-C2H2CI2 trans-C2H2CI2 is 0.6. At the same temperature the equilibrium constant for the reaction trans-C2H2CI2 cis-C2H2CI2 will be | 0.60 1.67 0.66 2.6 |
| 2 | The effect of increasing the pressure on the following equilibrium 2A + 3B | | 3A + 2B is | Forward reaction is favoured Backward reaction is favoured No effect None of the above |
| 3 | In the equilibrium N2 + 3H2 - 2NH3 + 22 kcal the formation of ammonia is favoured by |
Increasing the pressure Increasing the temperature Decreasing the pressure Adding ammonia |
| 4 | Which of the following value of ΔHf° represent that the product is least stable? | -94.0 kcal mol<sup>-1</sup> -231.6 <span style="font-size: 14.44444465637207px;">kcal mol</span><sup>-1</sup> +21.4 <span style="font-size: 14.44444465637207px;">kcal mol</span><sup>-1</sup> +64.8 <span style="font-size: 14.44444465637207px;">kcal mol</span><sup>-1</sup> |
| 5 | All the naturally occurring processes proceed spontaneously in a direction which lead to | Decrease of entropy Increase of enthalpy Increase of free energy Decrease of free energy |
| 6 | ΔHNeutralisation is always | Positive Negative Zero Positive or negative |
| 7 | The heats evolved in combustion of rhombic and monoclinic sulphur are - 70960 and -71030 cal mol-1 respectively what will be heat of conversion of rhombic sulphur ti monoclinic? | 70960 calories 71030 calories -70 calories +70 calories |
| 8 | Hess's law deals with | Changes in heat or reaction Rate of reaction Equilibrium constant Influence of pressure on volume of a gas |
| 9 | An exothermic reaction is one in which the reacting substances | Have more energy than the products Have less energy than the products Have the same energy as the products Are at a higher temperature than the products |
| 10 | An endothermic reaction is one in which | Heat is converted into electricity Heat is obsorbed Heat is evolved Heat is converted into mechanical work |
