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Mdcat-past-papers - UHS - Chemistry Quiz

Filters: Board: UHS | Subject: Chemistry |
21. The number of moles of water in 1kg of ice is:



22. How many moles of calcium carbonate are present in 77.5 kg of calcium carbonate? (Atomic mass of Ca = 40, C = 12, O = 16 → CaCO₃ = 100 g/mol)



23. 30 grams of 2-propanol were mixed with access acidified K2Cr2O7 and boiled under reflux for 20 min the organic product was than collected by distillation and 75% yield was obtained. What is the mass of product produced?



24. The same moles of H₂, N₂, and O₂ are present in 0.1 cc volume at STP. Which one has the greatest number of molecules?



25. Number of moles in an element is directly proportional to:



26. The number of molecules in 22.4dm³ of H₂ gas at 0° and 1atm are:



27. Which of the following is the correct equation to calculate relative molecular mass of a gas?



28. If we want to raise the temperature of one mole of an ideal gas by one kelvin, we have to provide how much amount of energy?



29. The process of heat flow between hotter and colder gases remains continued until all the molecules have equal:



30. Which of the following gases has the lowest density under room conditions?



31. The correct ideal gas equation is:



32. All the collisions between the particles of gases are elastic in nature. What is meant by "Elastic collisions".



33. Gas is enclosed in a container of 20 cm³ with the moving piston according to kinetic theory of gases what will be the effect on freely moving molecules of the gas if temp is increased from 20°C to 100°C.



34. A gaseous mixture contains 9.6% NH₃, 22.6% N₂ and 67.8% H₂ gases. If the total pressure is 50 atm, then the partial pressure of H₂ is:



35. The process of heat flow between hotter and colder gases remains continued until all the molecules have equal:



36. There are four gases H₂,He,N₂ and CO₂ , Which gas shows greater nonideal behavior?



37. The real gases show deviation from ideal behavior at:



38. Melting point of water is higher than petrol, because intermolecular forces of water are:



39. London dispersion forces are the only forces present among them:



40. In liquid, with the change in dipole-dipole forces, there is a change in some physical properties. Select the property which is not affected by the strength of dipole-dipole forces?



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