ETEA MDCAT Past Paper 2023 Re conduct 81- When an element occurs in different physical forms it is called __. A. AntisotropyB. IsomorphismC. PolymorphismD. Allotropy View Answer Answer : D. Allotropy Description 82- What mass of CaCO₃ give 48.8 liters (measured at STP) of CO₂ on strong heating? A. 100gB. 150gC. 200gD. 300g View Answer Answer : C. 200g Description 83- What is the reason of small atomic radii of sodium ions as compared to sodium atoms? A. ElectronegativityB. Effective nuclear chargeC. Electron affinityD. Shielding effect View Answer Answer : B. Effective nuclear charge Description 84- What is the radius of 3rd orbit of electron of H-atom: A. 3.39 A°B. 4.761 A°C. 5.29 x 10¹¹A°D. 9.7 A° View Answer Answer : B. 4.761 A° Description 85- What is the other name of positive rays? A. Canal raysB. Magnetic rays C. QuantumD. Photon rays View Answer Answer : A. Canal rays Description 86- What is the magnetic quantum number for S-orbital? A. 0B. 2C. 3D. 5 View Answer Answer : A. 0 Description 87- The volume of a fixed mass of gas is directly proportional to absolute temperature and constant pressure as stated by? A. daltons law B. Boyles law C. Avogadro’s law D. Charles law View Answer Answer : D. Charles law Description 88- The tautomer of propanol is: A. PropanalB. PropanoneC. Methyl ethyl ether D. Butanone View Answer Answer : B. Propanone Description 89- The substituent attached to the benzene ring that act as ring deactivator is: A. NO₂B. COOHC. ClD. NH₃ View Answer Answer : B. COOH Description 90- The specific heat of water is: A. 4.2 kJ/mol/k B. 4.2 J/g-kC. 4.6 J/g/k D. 42 J/g/k View Answer Answer : B. 4.2 J/g-k Description 91- The SI unit of pressure is: A. PascalB. mmHGC. TorrD. Atm View Answer Answer : A. Pascal Description 92- The reactant which consumes first in a chemical reaction is called? A. Consumed reactant B. Limiting reactantC. Excess reactant D. Non-reacted reactant View Answer Answer : B. Limiting reactant Description 93- The number of particles(atoms, molecules, ions) in one mole of any substance is numerically equal to? A. 6.023 x 10²³B. 6.023 x 10²⁵C. 4.02 x 10²³D. 4.02 x 10²⁵ View Answer Answer : A. 6.023 x 10²³ Description 94- The final substitution product in the chlorination of methane in the presence of UV light and excess chlorine is? A. Methylene chloride B. Carbon tetrachlorideC. Methylene dichloride D. Chloroform View Answer Answer : B. Carbon tetrachloride Description 95- The element chlorine is found in a gaseous state while bromine is found in? A. Solid state B. Liquid stateC. Crystalline forms D. Condensed form View Answer Answer : B. Liquid state Description 96- The correct sequence according to acidity of alcohols is? A. Primary > secondary > tertiary B. Tertiary > secondary > primary C. Secondary > primary > tertiaryD. Primary < secondary < tertiary View Answer Answer : A. Primary > secondary > tertiary Description 97- The correct order of reactivity of alkyl halides is : A. R-Br > R-Cl > R-F > R-l B. R-Br > R-F > R-I > R-ClC. R-I> R-Br > R-Cl > R-FD. R-Cl > R-I > R-Br > R-F View Answer Answer : C. R-I> R-Br > R-Cl > R-F Description 98- The bond that determines the secondary structure of a protein is? A. Co-ordinate bond B. Covalent bond C. Hydrogen bondD. Ionic bond View Answer Answer : C. Hydrogen bond Description 99- Super batteries with high charge density are also called: A. Primary batteries B. Secondary batteries C. Solar batteries D. Fuel batteries View Answer Answer : D. Fuel batteries Description 100- Silver Mirror with Tollens reagent is formed by? A. Acid halides B. AlcoholsC. KetonesD. Aldehydes View Answer Answer : D. Aldehydes Description 1 2 3 4 5 6 7 8 9 10
