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Mdcat-past-papers Quiz

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3701. The sum of all the energies of all the molecules or atoms of a substance is called its:



3702. If the work is done by the system on the surroundings and heat is absorbed by the system, the change in internal energy ΔE will be:



3703. Calculate the work done when 1 mole of an ideal gas expands from 15 dm³ to 20 dm³ against constant external pressure of 2 atmospheres.



3704. One slice of bread with a tablespoon of peanut butter on it contains 20g carbohydrate, 10g protein, and 9g fat. Calculate total energy consumed in this intake:



3705. One calorie is equal to:



3706. According to Hess's law, which one is a state function?



3707. First law of thermodynamics is represented as:



3708. Expansion takes place when a gas is evolved during a chemical reaction between marble chips and dilute HCl. Predict the energy change and work done:



3709. In standard enthalpy of atomization, heat of surrounding:



3710. ΔH will be given a negative sign in:



3711. Lattice energy of an ionic crystal is the enthalpy of:



3712. Heat of formation (ΔH°f) for CO₂ is:



3713. 2H₂O → ΔH = +285.5 kJ/mol What will be the enthalpy change in the equation?



3714. Combustion of graphite to form CO₂ can be done by two ways. Reactions are: C + O₂ → CO₂ ΔH = –284 kJ/mol C + ½O₂ → CO ΔH = –110 kJ/mol CO + ½O₂ → CO₂ ΔH = –676 kJ/mol What will be enthalpy of formation of CO?



3715. Reaction of water with quick lime results in the rise of temperature of the system. Using the concept of energy change, indicate the nature of the reaction:



3716. The equation that represents enthalpy of atomization of hydrogen is:



3717. Standard enthalpy of combustion of graphite at 25°C is –395.41 kJ/mol and that of diamond is –393.5 kJ/mol. The enthalpy change of graphite to diamond is:



3718. ½ H2 (g) →H(g) ΔH =218 kJ/mol in this reaction ΔH will be called



3719. Mg + ½O₂ → MgO(g) ΔH = –692 kJ/mol at STP. Enthalpy of above reaction will be called:



3720. Which one of the following enthalpy changes is always exothermic?



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