Practice Questions

Q39.What is the pH of a 10−4MOH− solution at 330 K, if Kw at 330 K is 10−13.6 ? (1) 4 (2) 9.0 (3) 10 (4) 9.6

Q39. NaOH is a strong base. What will be pH of 5.0 × 10−2MNaOH solution ? (log 2 = 0.3) (1) 14.00 (2) 13.70 (3) 13.00 (4) 12.70

Q40.Which one of the following is the wrong assumption of kinetic theory of gases ? JEE Main 2013 (25 Apr Online) JEE Main Previous Year Paper (1) Momentum and energy always remain conserved.(2) Pressure is the result of elastic collision of molecules with the container's wall. (3) Molecules are separated by great distances (4) All the molecules move in straight line between compared to their sizes. collision and with same velocity.

Q40.The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively : (1) 8, 10, 11 (2) 10, 10, 10 (3) 10, 11, 10 (4) 11, 10, 10 JEE Main 2013 (23 Apr Online) JEE Main Previous Year Paper

Q41.For gaseous state, if most probable speed is denoted by C* , average speed by C and root mean square speed by C, then for many molecules, what is the ratios of these speeds? (1) − (2) − C* : C : C = 1 : 1 .128 : 1 .225 C* : C : C = 1 : 1 .225 : 1 .128 (3) − (4) − C* : C : C = 1 .225 : 1 .128 : 1 C* : C : C = 1 .128 : 1 .225 : 1

Q42.Monocarboxylic acids are functional isomers of: (1) Ethers (2) Amines (3) Esters (4) Alcohols

Q43.Which of the following compounds is not expected to show Lassaignes' test for nitrogen ? (1) Propanenitrile (2) Hydroxylamine hydrochloride (3) Nitromethane (4) Ethanamine

Q43.The ratio Kp for the reaction CO(g) + 12 O2(g) ⇌CO2(g) is: Kc (1) 1 (2) (RT)1/2 √RT (3) RT (4) 1

Q44.Clemmensen reduction of a ketone is carried out in the presence of : (1) LiAlH4 (2) Zn −Hg with HCl (3) Glycol with KOH (4) H2 with Pt as catalyst

Q46.The rate constant of a zero order reaction is 2.0× 10−2 mol L−1 s−1 . If the concentration of the reactant after 25 seconds is 0.5M. What is the initial concentration? (1) 0.5M (2) 1.25M (3) 12.5M (4) 1.0M

Q46.Which one of the following statements about packing in solids is incorrect ? (1) Coordination number in bcc mode of packing is 8 (2) Coordination number in hep mode of packing is . 12 . (3) Void space in hcp mode of packing is 32%. (4) Void space in ccp mode of packing is 26%.

Q47. Cu+/Cu = +0.52 V, Fe3+/Fe2+ = +0.77 V, Electrode potentials (E∘) are given below : 1 Based on the above potentials, strongest I2( s)/I−= +0.54 V, 2 Ag+/Ag = +0.88 V. oxidizing agent will be : JEE Main 2013 (09 Apr Online) JEE Main Previous Year Paper (1) Cu+ (2) Fe3+ (3) Ag+ (4) I2

Q47.Smoke is an example of: (1) Solid dispersed in solid (2) Gas dispersed in liquid (3) Solid dispersed in gas (4) Gas dispersed in solid

Q47.The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was : (1) Ammonia (2) Phosgene (3) Methyl isocyanate (4) Methylamine

Q48.Which of the following exists as covalent crystals in the solid state ? (1) Sulphur (2) Phosphorus (3) Iodine (4) Silicon

Q49.A solution of copper sulphate (CuSO4) is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at the cathode (at. mass of Cu = 63u ) is : (1) 0.3892 g (2) 0.2938 g (3) 0.2398 g (4) 0.3928 g

Q49.In Goldschmidt aluminothermic process which of the following reducing agents is used : (1) calcium (2) coke (3) Al-powder (4) sodium JEE Main 2013 (22 Apr Online) JEE Main Previous Year Paper

Q49.The migration of dispersion medium under the influence of an electric potential is called : (1) Cataphoresis (2) Electroosmosis (3) Electrophoresis (4) Sedimentation

Q50.Calcination is the process in which: (1) ore is heated above its melting point to expel (2) ore is heated below its melting point to expel H2O or CO2 or SO2 volatile impurities (3) ore is heated above its melting point to remove (4) ore is heated below its melting point to expel S, As and Sb as SO2, As2O3 and Sb2O3 H2O or CO2 respectively

Q50.A radioactive isotope having a half - life period of 3 days was received after 12 days. If 3 g of the isotope is left in the container, what would be the initial mass of the isotope ? (1) 12 g (2) 36 g (3) 48 g (4) 24 g

Q51.The coagulating power of electrolytes having ions Na+ , Al3+ and Ba2+ for arsenic sulphide sol increases in the order, (1) Ba2+ < Na+ < Al3+ (2) Al3+ < Na+ < Ba2+ (3) Al3+ < Ba2+ < Na+ (4) Na+ < Ba2+ < Al3+

Q53.The order of reactivity of the given haloalkanes towards nucleophile is : (1) RI > RBr > RCl (2) RCl > RBr > RI (3) RBr > RCl > RI (4) RBr > RI > RCl

Q54.Type of isomerism which exists between [Pd(C6H5)2(SCN)2] and [Pd(C6H5)2(NCS)2] is : (1) Linkage isomerism (2) Coordination isomerism (3) Ionisation isomerism (4) Solvate isomerism

Q54.Cannizaro's reaction is not given by : JEE Main 2013 (25 Apr Online) JEE Main Previous Year Paper (1) (2) (3) CH3CHO (4) HCHO

Q54.The Wurtz-Fittig reaction involves condensation of: (1) two molecules of aryl halides (2) one molecule of each of aryl-halide and alkyl- halide. (3) one molecule of each of aryl-halide and phenol. (4) two molecules of aralkyl-halides.