NUMS MDCAT Past Paper Dated: 2022 121- Which of the following represents equation for ideal gas? A. PV=nRTB. PT=nRvC. P=nRTD. T=npv/R View Answer Answer : A. PV=nRT Description 122- How should the condition be changed to prevent the value of a given gas from expanding when its mass is increased? A. Temperature is lowered & pressure is increasedB. Temperature is increased & pressure is loweredC. Temperature & pressure both are loweredD. Temperature & pressure both are increased View Answer Answer : A. Temperature is lowered & pressure is increased Description 123- Which variable mentioned in ideal gas is assumed to be constant in other gas laws? A. VolumeB. TemperatureC. PressureD. Number of moles View Answer Answer : D. Number of moles Description 124- Which of the following molecules will show a higher rate of evaporation? A. AcetoneB. EthanolC. WaterD. Ethylene glycol View Answer Answer : A. Acetone Description 125- Specific heat of water is: A. 4.18 J/g/°CB. 9.82 J/g/°CC. 6.04 J/g/°CD. 8.47 J/g/°C View Answer Answer : A. 4.18 J/g/°C Description 126- The boiling point of compound is mostly raised by: A. Dipole induced Dipole inter actionB. London dispersion forcesC. Intra molecular H-bondingD. Inter molecular H-bonding View Answer Answer : D. Inter molecular H-bonding Description 127- Which of the following statement explains solubility of ionic substance in water? A. Water molar mass is 18.02B. Water forms dative bondingC. Water molecule is polarD. Water has high density View Answer Answer : C. Water molecule is polar Description 128- Nature of diamond as solid is: A. CovalentB. IonicC. MolecularD. Metallic View Answer Answer : A. Covalent Description 129- Which one of the following is as light as a feather and as strong as iron? A. GraphiteB. GrapheneC. MercuryD. Diamond View Answer Answer : B. Graphene Description 130- The pH of human blood is: A. 7.35 to 7.45B. 8.35 to 8.45C. 6.35 to 7.45D. 5.57 to 6.57 View Answer Answer : A. 7.35 to 7.45 Description 131- Proton number of ²³Na₁₁ is: A. 11B. 23C. 12D. 34 View Answer Answer : A. 11 Description 132- One mole of ethanol and one mole of ethane have an equal: A. Number of moleculesB. Number of electronsC. MassD. Number of atoms View Answer Answer : A. Number of molecules Description 133- The 1ˢᵗ step involved in the determination of Empirical Formula of chemical compound is: A. Finding number of gram atoms of each elementB. Percentage composition of each elementC. Atomic ratio of each elementD. Multiplication of atomic ratio with whole number View Answer Answer : B. Percentage composition of each element Description 134- The number of moles of CO₂ which contains 16 g of oxygen is: A. 0.25B. 0.5C. 1.0D. 1.50 View Answer Answer : B. 0.5 Description 135- Percentage composition of mass in CO₂ is: A. 30.45% Carbon & 69.54% OxygenB. 24.22% Carbon & 75.78% OxygenC. 27.27% Carbon & 72.73% OxygenD. 41.68% Carbon & 58.12% Oxygen View Answer Answer : C. 27.27% Carbon & 72.73% Oxygen Description 136- Maximum electrons that can be placed in p subshell are: A. 2B. 6C. 10D. 14 View Answer Answer : B. 6 Description 137- Apply n-i rule and calculate which of the following orbital has maximum energy? A. 4sB. 2pC. 2dD. 3s View Answer Answer : A. 4s Description 138- The mass of electron is: A. 1836 times more than mass of protonB. 1836 times less than mass of protonC. 1836 times more than mass of neutronD. 1836 times more than mass of hydrogen atom View Answer Answer : B. 1836 times less than mass of proton Description 139- The shape of an orbital is determined by which quantum number? A. nB. lC. mD. s View Answer Answer : B. l Description 140- The electronic configuration for degenerate orbitals is explained by: A. Aufbau PrincipleB. n-i RuleC. Hund’s RuleD. Paul’s Exclusion Principle View Answer Answer : C. Hund's Rule Description 1 2 3 4 5 6 7 8
