Practice Questions

Q48.The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them: JEE Main 2015 (10 Apr Online) JEE Main Previous Year Paper (1) Entropy of adsorption is negative (2) Enthalpy of adsorption is negative (3) On adsorption decrease in surface energy appears (4) On adsorption, the residual forces on the surface as heat are increased

Q48.Which among the following is the most reactive? (1) ICl (2) Cl2 (3) Br2 (4) I2

Q49.In the isolation of metals, calcination process usually results in: (1) Metal oxide (2) Metal carbonate (3) Metal sulphide (4) Metal hydroxide

Q49.Which one has the highest boiling point? (1) Xe (2) He (3) Ne (4) Kr

Q50.Calamine is an ore of: (1) Iron (2) Copper (3) Aluminium (4) Zinc

Q51.Chlorine water on standing loses its color and forms: JEE Main 2015 (11 Apr Online) JEE Main Previous Year Paper (1) HOCl and HOCl2 (2) HCl only (3) HCl and HClO2 (4) HCl and HOCl

Q53.Which molecule/ion among the following cannot act as a ligand in complex compounds? (1) CN− (2) CH4 (3) CO (4) Br−

Q54.The synthesis of alkyl fluorides is best accomplished by: (1) Swarts reaction (2) Free radical fluorination (3) Sandmeyer's reaction (4) Finkelstein reaction

Q56.In the presence of a small amount of phosphorous, aliphatic carboxylic acid reacts with chlorine or bromine to yield a reaction in which, α− hydrogen is been replaced by halogen. This reaction is known as (1) Etard reaction (2) Wolff-Kischner reaction (3) Rosenmund reaction (4) Hell-volhard-zelinsky reaction

Q58.Which one of the following structures represents the neoprene polymer? (1) (2) (3) (4)

Q58.Match the polymers in column-A with their main uses in column-B and choose the correct answer: Column - A Column - B A. Polystyrene i. Paints and lacquers B. Glyptal ii. Rain coats C. Polyvinyl chloride iii. Manufacture of toys D. Bakelite iv. Computer discs (1) A - iii , B - i , C - ii , D - iv (2) A - ii , B - i , C - iii , D - iv (3) A - ii , B - iv , C - iii , D - i (4) A - iii , B - iv , C - ii , D - i

Q58.Which polymer is used in the manufacture of paints and lacquers? (1) Poly vinyl chloride (2) Bakelite (3) Glyptal (4) Polypropene

Q59.Which artificial sweetener contains chlorine? (1) Sucralose (2) Alitame (3) Saccharin (4) Aspartame

Q59.Which of the following compounds is not an antacid? (1) Ranitidine (2) Aluminium hydroxide (3) Cimetidine (4) Phenelzine

Q59. is used as: (1) Antacid (2) Insecticide (3) Antihistamine (4) Analgesic

Q60.Complete hydrolysis of starch gives: (1) Galactose and fructose in equimolar amounts (2) Glucose and galactose in equimolar amounts (3) Glucose and fructose in equimolar amounts (4) Glucose only JEE Main 2015 (10 Apr Online) JEE Main Previous Year Paper

Q60.Which of the vitamins given below is water soluble? (1) Vitamin K (2) Vitamin C (3) Vitamin D (4) Vitamin E

Q60.Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise? (1) Glycogen (2) Pyruvic acid (3) Glucose (4) L-lactic acid

Q31.The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is: (1) 1 : 4 (2) 7 : 32 (3) 1 : 8 (4) 3 : 16

Q32.The amount of oxygen in 3. 6 moles of water is: (1) 57. 6 g (2) 115. 2 g (3) 18. 4 g (4) 28. 8 g

Q32.If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be: 1 e2 (1) r (2) −e2r 2 (3) me2 r (4) −12 e2r

Q33.The de-Broglie wavelength of a particle of mass 6.63 g moving with a velocity of 100 ms−1 is: (1) 10−33 m (2) 10−35 m (3) 10−31 m (4) 10−25 m

Q34.Excited hydrogen atom emits light in the ultraviolet region at 2.47 × 1015 Hz. With this frequency, the energy of a single photon is: (h = 6.63 × 10−34Js) (1) 8.041 × 10−40 J (2) 2.680 × 10−19 J (3) 1.640 × 10−18 J (4) 6.111 × 10−17 J

Q35.Similarity in chemical properties of the atoms of elements in a group of the Periodic table is most closely related to: (1) atomic numbers (2) atomic masses (3) number of principal energy levels (4) number of valence electrons

Q37.For the reaction SO2(g) + 12 O2(g) ⇌SO3(g) , if KP = KC(RT)x where the symbols have usual meaning then the value of x is: (assuming ideality) (1) −1 (2) −12 (3) 1 (4) 1 2