Practice Questions

Q59.The reason for "drug induced poisoning" is: (1) binding irreversibly to the active site of the (2) binding at the allosteric sites of the enzyme. enzyme. (3) binding reversibly at the active site of the (4) brining conformational change in the binding site enzyme. of enzyme. JEE Main 2017 (08 Apr Online) JEE Main Previous Year Paper

Q60.The incorrect statement among the following is (1) α −D−glucose and β −D− glucose are (2) the penta acetate of glucose does not react with enantiomers. hydroxyl amine. (3) α −D−glucose and β −D−glucose are anomers.(4) cellulose is a straight chain polysaccharide made up of only β −D−glucose units.

Q60.Among the following, the essential amino acid is: (1) Valine (2) Alanine (3) Serine (4) Aspartic acid

Q31.An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% Sulphur is (1) 600 g mol−1 (2) 200 g mol−1 (3) 400 g mol−1 (4) 300 g mol−1

Q31.Aqueous solution of which of the following salts will not contain ions with the electronic configuration 1s22s22p63s23p6 ? (1) NaF (2) KBr (3) NaCl (4) CaI2

Q33.The total number of orbitals associated with the principal quantum number 5 is: (1) 20 (2) 25 (3) 10 (4) 5

Q33.Which of the following atoms has the highest first ionization energy? (1) K (2) Sc (3) Rb (4) Na

Q36.Which intermolecular force is most responsible in allowing xenon gas to liquefy? (1) London forces (2) Ion-dipole (3) Ionic (4) Dipole-dipole

Q36.The heats of combustion of carbon and carbon monoxide are −393.5 and −283.5 kJ mol−1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is: (1) − 676.5 (2) −110 (3) 110.5 (4) 676.5

Q36.A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. Kp for this reaction is? (1) 25 (2) 100 (3) 10 (4) 5

Q38.What is the commercial name for calcium oxide? (1) Quick lime (2) Milk of lime (3) Slaked lime (4) Limestone

Q39.The main oxides formed on combustion of Li, Na and K in excess of air are respectively: (1) Li2O2, Na2O2 and KO2 (2) Li2O, Na2O2 and KO2 (3) Li2O, Na2O and KO2 (4) LiO2, Na2O2 and K2O

Q41.The distillation technique most suited for separating glycerol from spent - lye in the soap industry is: (1) Steam distillation (2) Distillation under reduced pressure (3) Simple distillation (4) Fractional distillation

Q43.The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0. 2 ppm, respectively. This water is unsuitable for drinking due to high concentration of: (1) Nitrate (2) Iron (3) Fluoride (4) Lead Q44. 18 g glucose (C6H12O6) is added to 178. 2 g water. The vapour pressure of water (in torr) for this aqueous solution is: (1) 752. 4 (2) 759. 0 (3) 7. 6 (4) 76. 0

Q43.Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution? (1) Sulphur dioxide (2) Carbon dioxide (3) Nitrogen dioxide (4) Tetrachloroethylene

Q44.BOD stands for: (1) Bacterial Oxidation Demand (2) Biological oxygen demand (3) Biochemical oxygen demand (4) Both A and B

Q45.Galvanization is applying a coating of: (1) Cu (2) Zn (3) Pb (4) Cr

Q46.What will happen when a block of copper metal is dropped into a beaker containing a solution of 1 M ZnSO4 ? (1) The copper metal will dissolve with evolution of (2) The copper metal will dissolve with evolution of oxygen gas. hydrogen gas. (3) No reaction will occur. (4) The copper metal will dissolve and zinc metal will be deposited.

Q47.The rate law for the reaction below is given by the expression k[A][B] A + B →Product If the concentration of B is increased from 0. 1 to 0. 3 mol , keeping the value of A at 0. 1 mol , the rate constant will be: (1) 3k (2) 9k (3) k/3 (4) k

Q47.For a linear plot of log ( mx ) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct? ( k and n are constants) (1) Only n 1 appears as the slope. (2) log( n1 ) appears as the intercept. (3) Both k and n1 appear in the slope term. (4) n1 appears as the intercept.

Q48.The hottest region of Bunsen flame shown in the figure below is: (1) Region 3 (2) Region 4 (3) Region 1 (4) Region 2

Q49.Extraction of copper by smelting uses silica as an additive to remove. (1) Cu2O (2) FeS (3) FeO (4) Cu2S

Q49.Which one of the following ores is best concentrated by froth flotation method? (1) Galena (2) Malachite (3) Magnetite (4) Siderite

Q51.The non-metal that does not exhibit positive oxidation state is: (1) Chlorine (2) Iodine (3) Fluorine (4) Oxygen JEE Main 2016 (09 Apr Online) JEE Main Previous Year Paper

Q52.Which of the following is an example of homoleptic complex? (1) [Co(NH3)6]Cl3 (2) [Pt(NH3)2Cl2] (3) [Co(NH3)4Cl2] (4) [Co(NH3)5Cl]Cl2