ETEA MDCAT Past Paper 2020 81- The common oxidation number of halogens is: A. -1B. +1C. -2D. 0 View Answer Answer : A. -1 Description 82- During oxidation process, oxidation number of an element: A. DecreasesB. IncreasesC. Remains constantD. Both A&B View Answer Answer : B. Increases Description 83- Which of the following has the height value of electronegativity? A. IB. ClC. BrD. F View Answer Answer : D. F Description 84- Which of the following hybrid orbitals has maximum 'S' –character? A. Sp³ – hybrid orbitalB. Sp² – hybrid orbitalC. Sp – hybrid orbitalD. Dsp² – hybrid orbital View Answer Answer : C. Sp – hybrid orbital Description 85- The first ionization energy is maximum for: A. NaB. MgC. AlD. K View Answer Answer : B. Mg Description 86- The efficiency of chemical reaction can be expressed as: A. Theoretical yieldB. Actual yieldC. %yieldD. Maximum yield View Answer Answer : C. %yield Description 87- In a vessel, 10g N₂, 10g H and 10g O₂ are present. Which one will have least number of atoms? A. H₂B. N₂C. O₂D. Both H₂ & N₂ View Answer Answer : B. O₂ Description 88- The empirical formula of Glucose C₆H₁₂O₆ is: A. C₆H₁₂O₁₆B. CHOC. CH₂OD. CH₂O₂ View Answer Answer : C. CH₂O Description 89- The relationship between quantum number n and I is: A. N = 1-1B. I = n-2C. I = n-1D. N = 1-2 View Answer Answer : C. I = n-1 Description 90- Quantum number values for '2p' orbitals are: A. N=2, I=1B. N=1, I=2C. N=1, I=0D. N=2, I=0 View Answer Answer : A. N=2, I=1 Description 91- Which pair has 1 electron in it's 's' orbital? A. Li, FeB. Na & CrC. K & MnD. H & He View Answer Answer : B. Na & Cr Description 92- Which of the following has the lowest e/m ratio? A. Li⁺²B. H⁺¹C. HeD. Be View Answer Answer : D. Be Description 93- According to the general gas equation density of an ideal gas depends upon: A. PressureB. TemperatureC. Molar mass of the gasD. All of the above View Answer Answer : D. All of the above Description 94- The actual volume of gas molecules is considered negligible at following pressures: A. 2 atmB. 4 atmC. 6 atmD. 8 atm View Answer Answer : A. 2 atm Description 95- CO₂ and SO₂ both are triatomic molecules but heat of vaporization of SO₂ is greater than that of CO₂ due to: A. High electronegativity of SB. Greater size of SO₂C. SO₂ is polar and CO₂ is non-polarD. SO₂ is more acidic than CO₂ View Answer Answer : C. SO₂ is polar and CO₂ is non-polar Description 96- Which of the following has the lowest vapour pressure at 20 °C? A. Diethyl etherB. ChloroformC. Carbon tetrachlorideD. Water View Answer Answer : D. Water Description 97- Which of the following is not a molecular solid? A. BromineB. SulphurC. PhosphorusD. Carbon dioxide View Answer Answer : D. Carbon dioxide Description 98- The lattice energy is also called as: A. Energy of affinityB. Bond energyC. Crystal energyD. Potential energy View Answer Answer : C. Crystal energy Description 99- For a gaseous phase reaction, when number of moles of reactants and products are equal: A. The values of Kp is greater than KcB. The values of Kp and Kc are differentC. The values of Kc is greater than KpD. The values of Kp and KC are the same View Answer Answer : D. The values of Kp and KC are the same Description 100- Purification of table salt (NaCl) by passing HCl gas through its saturated aqueous solution is an example of: A. Law of mass actionB. Hess’s lawC. Common ion effectD. Henry’s law View Answer Answer : C. Common ion effect Description 1 2 3 4 5 6 7 8 9 10
