Practice Questions

Q55.Phenol on heating with CHCl3 and NaOH gives salicylaldehyde. The reaction is called: (1) Reimer - Tiemann reaction (2) Claisen reaction (3) Cannizzaro's reaction (4) Hell - Volhard - Zelinsky reaction

Q55.What is the structure of the major product when phenol is treated with bromine water? (1) (2) (3) (4)

Q56.Aryl fluoride may be prepared from arene diazonium chloride using : (1) HBF4/Δ (2) HBF4/NaNO2, Cu, Δ (3) CuF/HF (4) Cu/HF 0

Q57.Which of the following polymer is a polyamide ? (1) Terylene (2) Nylon (3) Rubber (4) Vulcanised rubber

Q57.Carbylamine forms from aliphatic or aromatic primary amine via which of the following intermediates? (1) Carbanion (2) Carbene (3) Carbocation (4) Carbon radical

Q58. H1− Receptor antagonists is a term associated with : (1) Antiseptics (2) Antihistamins (3) Antacids (4) Analgesics

Q58.The polymer used for optical lenses is : (1) polypropylene (2) polyvinyl chloride (3) polythene (4) polymethyl methacrylate

Q59.Glycosidic linkage is actually an : (1) Carbonyl bond (2) Ether bond (3) Ester bond (4) Amide bond JEE Main 2013 (23 Apr Online) JEE Main Previous Year Paper

Q59.Bakelite is obtained from phenol by reacting with: (1) Acetal (2) CH3CHO (3) HCHO (4) Chlorobenzene

Q60.Which of the following structures represents thymine ? (1) (2) (3) (4)

Q60.Which of the following enzyme converts starch into maltose? (1) Diastase (2) Maltase (3) Zymase (4) Invertase

Q60.Synthesis of each molecule of glucose in photosynthesis involves (1) 8 molecules of ATP (2) 6 molecules of ATP (3) 18 molecules of ATP (4) 10 molecules of ATP

Q60.Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is : (1) Vitamin A (2) Vitamin B (3) Vitamin D (4) Vitamin C

Q32.The electrons identified by quantum numbers n and I : (a) n = 4, I = 1 (b) n = 4, l = 0 (c) n = 3, I = 2 (d) n = 3, I = 1 Can be placed in order of increasing energy as: (1) (c) < (d) < (b) < (a) (2) (d) < (b) < (c) < (a) (3) (b) < (d) < (a) < (c) (4) (a) < (c) < (b) < (d)

Q32.The ratio of number of oxygen atoms (O) in 16.0 g ozone (O3), 28.0 g carbon monoxide (CO) and 16.0 oxygen (O2) is (Atomic mass : C = 12, O = 16 and Avogadro's constant NA = 6.0 × 1023 mol−1 ) (1) 3 : 1 : 2 (2) 1 : 1 : 2 (3) 3 : 1 : 1 (4) 1 : 1 : 1

Q33.If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become (1) one fourth (2) half (3) four times (4) two times

Q34.Which among the following elements has the highest first ionization enthalpy? (1) Nitrogen (2) Boron (3) Carbon (4) Oxygen

Q35.Which one of the following will react most vigorously with water? JEE Main 2012 (19 May Online) JEE Main Previous Year Paper (1) Li (2) K (3) Rb (4) Na

Q36.Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point? JEE Main 2012 (07 May Online) JEE Main Previous Year Paper (1) NaCl (2) KCl (3) LiCl (4) RbCl

Q36.The relationship among most probable velocity, average velocity and root mean square velocity is respectively (1) √2 : √3 : √8/π (2) √2 : √8/π : √3 (3) √8/π : √3 : √2 (4) √3 : √8/π : √2

Q37.For 1 mol of an ideal gas at a constant temperature T , the plot of (log P) against (log V ) is a ( P : Pressure, V : Volume) (1) Straight line parallel to x-axis. (2) Straight line with a negative slope. (3) Curve starting at origin. (4) Straight line passing through origin.

Q38.The entropy of a sample of a certain substance increases by 0.836 J K−1 on adding reversibly 0.3344 J of heat at constant temperature. The temperature of the sample is: (1) 2.5 K (2) 0.3 K (3) 0.016 K (4) 0.4 K

Q38.The equilibrium constant (Kc) for the reaction N2(g) + O2( g) →2NO(g) at temperature T is 4 × 10−4 . The value of Kc for the reaction, NO(g) →1/2 N2(g) + 1/2 O2(g) at the same temperature is : (1) 0.02 (2) 2.5 × 102 (3) 4 × 10−4 (4) 50.0

Q40.Very pure hydrogen (99.9%) can be made by which of the following processes? (1) Reaction of methane with steam (2) Mixing natural hydrocarbons of high molecular weight (3) Electrolysis of water (4) Reaction of salt like hydrides with water

Q40.Fire extinguishers contain H2SO4 and which one of the following? JEE Main 2012 (26 May Online) JEE Main Previous Year Paper (1) NaHCO3 and Na2CO3 (2) Na2CO3 (3) NaHCO3 (4) CaCO23