Practice Questions

Q55.The gas evolved on heating CH3MgBr in methanol is: (1) Methane (2) Ethane (3) Propane (4) HBr

Q56.Bouveault-Blanc reduction reaction involves: (1) Reduction of an acyl halide with H2/Pd. (2) Reduction of an anhydride with LiAlH4 (3) Reduction of an ester with Na/C2H5OH . (4) Reduction of a carbonyl compound with Na / Hg and HCl.

Q57.The test to distinguish primary, secondary and tertiary amines is: (1) Sandmeyer's reaction (2) Carbylamine reaction (3) Idoform test (4) C6H5SO2Cl

Q59.The artificial sweetener that has the highest sweetness value in comparison to cane sugar is: (1) Sucralose (2) Aspartame (3) Saccharin (4) Alitame JEE Main 2016 (09 Apr Online) JEE Main Previous Year Paper

Q59.Which of the following is a bactericidal antibiotic? (1) Ofloxacin (2) Tetracycline (3) Chloramphenicol (4) Erythromycin

Q59.Which of the following is an anionic detergent? (1) Cetyltrimethyl ammonium bromide (2) Glyceryl oleate (3) hexadecyltrimethyl ammonium bromide (4) Sodium lauryl sulphate

Q60.Thiol group is present in: (1) Cysteine (2) Methionine (3) Cytosine (4) Cystine

Q32.Which of the following is the energy of a possible excited state of hydrogen? (1) +6.8 eV (2) +13.6 eV (3) −6.8 eV (4) −3.4 eV

Q32.If the principal quantum number n = 6, the correct sequence of filling of electrons will be: (1) ns →(n −1) d →(n −2) f →np (2) ns →np →(n −1)d →(n −2)f (3) ns →(n −2)f →np →(n −1)d (4) ns →(n −2)f →(n −1)d →np

Q33.An element X shows +3, oxidation state in its compounds. Out of the four compounds given below, choose the incorrect formula for the element X . (1) X2O3 (2) X2(SO4)3 (3) XPO4 (4) X2Cl3

Q33.In the long form of the periodic table, the valence shell electronic configuration of 5s25p4 corresponds to the element present in: (1) Group 16 and period 5 (2) Group 17 and period 5 (3) Group 16 and period 6 (4) Group 17 and period 6

Q36.Which of the following is not an assumption of the kinetic theory of gases? (1) Collisions of gas particles are perfectly elastic. (2) A gas consists of many identical particles which are in continual motion. (3) At high pressure, gas particles are difficult to (4) Gas particles have negligible volume. compress.

Q37.When does a gas deviate the most from its ideal behavior? (1) At low pressure and high temperature (2) At high pressure and high temperature (3) At low pressure and low temperature (4) At high pressure and low temperature

Q37.From the following statements, choose the incorrect statement regarding H2O2 . (1) It has to be kept away from dust. (2) It can act only as an oxidising agent. (3) It decomposes on exposure to light. (4) It has to be stored in plastic or wax-lined glass bottles in the dark.

Q39.Permanent hardness in water cannot be cured by: (1) Treatment with washing soda (2) Ion exchange method (3) Calgon's method (4) Boiling

Q39.Which physical property of di-hydrogen is wrong? (1) Tasteless gas (2) Odourless gas (3) Colourless gas (4) Non-inflammable gas

Q40.Which of the alkaline earth metal halides given below is essentially covalent in nature? (1) BeCl2 (2) MgCl2 (3) SrCl2 (4) CaCl2

Q41.Assertion: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason: The reaction between nitrogen and oxygen requires high temperature. (1) Both the Assertion and Reason are incorrect. (2) Both Assertion and Reason are correct and the Reason is the correct explanation for the Assertion. (3) Both Assertion and Reason are correct, but the (4) The Assertion is incorrect but the Reason is Reason is not the correct explanation for the correct. Assertion.

Q42.Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å . The radius of sodium atom is approximately: (1) 0.93 Å (2) 1.86 Å (3) 3.22 Å (4) 5.72 Å

Q43.Which of the following pairs of compounds are positional isomers? JEE Main 2015 (11 Apr Online) JEE Main Previous Year Paper (1) (2) (3) (4)

Q44.Addition of phosphate fertilizers to water bodies causes: (1) Deposition of calcium phosphate (2) Enhanced growth of algae (3) Increase in fish population (4) Increase in amount of dissolved oxygen in water

Q44.Two Faraday of electricity is passed through a solution of CuSO4 . The mass of copper deposited at the cathode is: (Atomic mass of Cu = 63.5 amu) (1) 127 g (2) 0 g (3) 63.5 g (4) 2 g

Q45.A solution at 20oC is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively: (1) 30.5 torr and 0.389 (2) 35.0 torr and 0.480 (3) 38.0 torr and 0.589 (4) 35.8 torr and 0.280

Q45.Higher order (>3) reactions are rare due to: (1) Loss of active species on collision. (2) Low probability of simultaneous collision of all the reacting species. (3) Increase in entropy and activation energy as more (4) Shifting of equilibrium towards reactants due to molecules are involved. elastic collisions. Q46. 3 g of activated charcoal was added to 50 mL of acetic acid solution (0. 06 N) in a flask. After an hour, it was filtered and the strength of the filtrate was found to be 0. 042 N . The amount of acetic acid adsorbed (per gram of charcoal) is: (1) 54 mg (2) 18 mg (3) 36 mg (4) 42 mg JEE Main 2015 (04 Apr) JEE Main Previous Year Paper

Q47. A + 2B →C , the rate equation for the reaction is given as Rate = k [A] [B] If the concentration of A is kept the same but that of B is doubled what will happen to the rate itself? (1) Doubled (2) Halved (3) The same (4) Quadrupled