Practice Questions

Q52.Three reactions involving H2PO−4 are given below : (i) H3PO4 + H2O →H3O+ + H2PO−4 (ii) H2PO−4 + H2O →HPO2−4 + H3O+ (iii) H2PO−4 + OH−→H3PO4 + O2− In which of the above does H2PO−4 act as an acid ? (1) (ii) only (2) (i) and (ii) (3) (iii) only (4) (i) only

Q56.From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl2 , is (1) 2-Butanol (2) 2-Methylpropan-2-ol (3) 2-Methylpropanol (4) 1-Butanol

Q59.The polymer containing strong intermolecular forces e.g. hydrogen bonding, is (1) teflon (2) nylon 6,6 (3) polystyrene (4) natural rubber

Q60.Biuret test is not given by (1) carbohydrates (2) polypeptides (3) urea (4) proteins

Q32.Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 × 103 ms−1 (Mass of proton = 1.67 × 10−27 kg and h = 6.63 × 10−34Js ): JEE Main 2009 JEE Main Previous Year Paper (1) 0.032 nm (2) 0.40 nm (3) 2.5 nm (4) 14.0 nm

Q34.The set representing the correct order of ionic radius is : (1) Li+ > Be2+ > Na+ > Mg2+ (2) Na+ > Li+ > Mg2+ > Be2+ (3) Li+ > Na+ > Mg2+ > Be2+ (4) Mg2+ > Be2+ > Li+ > Na+

Q37.Solid Ba (NO3)2 is gradually dissolved in a 1.0 × 10−4MNa2CO3 solution. At what concentration of Ba2+ will a precipitate begin to form ? (Ksp for BaCO3 = 5.1 × 10−9). (1) 4.1 × 10−5M (2) 5.1 × 10−5M (3) 8.1 × 10−8M (4) 8.1 × 10−7M

Q40.The alkene that exhibits geometrical isomerism is: (1) propene (2) 2-methyl propene (3) 2-butene (4) 2- methyl -2- butene JEE Main 2009 JEE Main Previous Year Paper

Q42.The IUPAC name of neopentane is (1) 2-methylbutane (2) 2, 2-dimethylpropane (3) 2-methylpropane (4) 2,2-dimethylbutane

Q43.Copper crystallizes in fcc with a unit cell length of 361pm. What is the radius of copper atom ? (1) 108pm (2) 127pm (3) 157 pm (4) 181pm

Q49.Which of the following statements is incorrect regarding physissorptions ? JEE Main 2009 JEE Main Previous Year Paper (1) It occurs because of vander Waal's forces. (2) More easily liquefiable gases are adsorbed readily. (3) Under high pressure it results into multi (4) Enthalpy of adsorption (ΔHadsorption ) is low and molecular layer on adsorbent surface. positive.

Q56.The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is : (1) benzoic acid (2) salicylaldehyde (3) salicylic acid (4) phthalic acid

Q58.A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was: (1) CH3OH (2) HCHO (3) CH3COCH3 (4) CH3COOH

Q59.Buna-N synthetic rubber is a copolymer of : (1) (2) (3) (4)

Q60.The two functional groups present in a typical carbohydrate are : (1) −OH and −COOH (2) −CHO and −COOH (3) > C = O and −OH (4) −OH and −CHO

Q36.Which one of the following constitutes a group of the isoelectronic species? (1) C2−2 , O−2 , CO, NO (2) NO+, C2−2 , CN−, N2 (3) CN−, N2, O2−2 , C2−2 (4) N2, O−2 , NO+, CO

Q42.For the following three reactions a, b and c, equilibrium constants are given: a. CO(g) + H2O(g) ⇌CO2( g) + H2( g); K1 b. CH4( g) + H2O(g) ⇌CO(g) + 3H2( g); K2 c. JEE Main 2008 JEE Main Previous Year Paper CH4( g) + 2H2O(g) ⇌CO2( g) + 4H2( g); K3 Which of the following relations is correct? (1) K1√K2 = K3 (2) K2 K3 = K1 (3) K3 = K1 K2 (4) K3 ⋅K32 = K21

Q49.The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is JEE Main 2008 JEE Main Previous Year Paper (1) −COOH, −SO3H, −CONH2, −CHO (2) −SO3H, −COOH, −CONH2, −CHO (3) −CHO, −COOH, −SO3H, −CONH2 (4) −CONH2, −CHO, −SO3H, −COOH

Q51.In the following sequence of reactions, the alkene affords the compound ' B ' O3 H2O CH3CH = CHCH3 ⟶A Zn B. The compound B is (1) CH3CH2CHO (2) CH3COCH3 (3) CH3CH2COCH3 (4) CH3CHO

Q53.The treatment of CH3MgX with CH3C ≡C −H produces (1) (2) CH3 −CH = CH2 (3) (4)

Q54.Identify the wrong statements in the following: JEE Main 2008 JEE Main Previous Year Paper (1) Chlorofluorocarbons are responsible for ozone (2) Greenhouse effect is responsible for global layer depletion warming (3) Ozone layer does not permit infrared radiation (4) Acid rains is mostly because of oxides of from the sun to reach the earth nitrogen and sulphur

Q59.For a reaction 1 A →2B, rate of disappearance of ' A ' is related to the rate of appearance of 'B' by the 2 expression (1) −d[A]dt = 12 d[B]dt (2) −d[A]dt = 14 d[B]dt (3) −d[A]dt = d[B]dt (4) −d[A]dt = 4 d[B]dt

Q60.Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is (1) D < A < C < B (2) C < B < D < A (3) A < C < B < D (4) B < D < A < C

Q61.The hydrocarbon which can react with sodium in liquid ammonia is (1) CH3CH2CH2C ≡CCH2CH2CH3 (2) CH3CH2C ≡CH (3) CH3CH = CHCH3 (4) CH3CH2C ≡CCH2CH3

Q69.Bakelite is obtained from phenol by reacting with (1) (CH2OH)2 (2) CH3CHO (3) CH3COCH3 (4) HCHO Q70. α −D −(+)-glucose and β −D −(+) −glucose are (1) conformers (2) epimers (3) anomers (4) enantiomers JEE Main 2008 JEE Main Previous Year Paper