Practice Questions

Q44. The IUPAC name of the following compound is (1) (E)-2-hepten-4-yne (2) (Z)-5-hepten-3-yne (3) (E)-5-hepten-3-yne (4) (Z)-2-hepten-4-yne

Q44.The IUPAC name of the compound < smiles>CC1CO1 < /smiles> is (1) 1, 2-Propoxide (2) Propylene oxide (3) 1,2-Oxo propane (4) 1, 2-Epoxy propane

Q44.Consider the following sequence of reactions Compound ' C ' is JEE Main 2012 (26 May Online) JEE Main Previous Year Paper (1) (2) (3) HOCH2 −CH = CH2 (4)

Q44.What is DDT among the following : (1) Greenhouse gas (2) A fertilizer (3) Biodegradable pollutant (4) Non-biodegradable pollutant

Q44.In the below mentioned compounds the decreasing order of reactivity towards electrophilic substitution is (i) (ii) JEE Main 2012 (12 May Online) JEE Main Previous Year Paper (iii) (iv) (1) (iv) > (i) > (ii) > (iii) (2) (ii) > (iii) > (i) > (iv) (3) (iii) > (i) > (iv) > (ii) (4) (i) > (ii) > (iii) > (iv)

Q45.Lithium forms body centred cubic structure. The length of the side of its unit cell is 351pm. Atomic radius of the lithium will be: (1) 75 pm (2) 300 pm (3) 240 pm (4) 152 pm

Q45.Among the following the order of reactivity towards nucleophilic addition is (1) CH3CHO > CH3COCH3 > HCHO (2) HCHO > CH3CHO > CH3COCH3 (3) CH3CHO > HCHO > CH3COCH3 (4) CH3COCH3 > CH3CHO > HCHO

Q45.Beilstein test is used for the estimation of which one of the following elements? (1) S (2) Cl (3) C and H (4) N

Q45.The reaction, CH3CHO Zn(Hg)/[H]Conc. HCl CH3CH3 (1) Cannizaro's reaction (2) Rosenmund reduction (3) Wolf-Kishner reduction (4) Clemmenson reduction

Q45.Which one of the following depletes ozone layer? (1) CO (2) NO and freons (3) SO2 (4) CO2

Q46.Water sample is reported to be highly polluted if BOD (Biological Oxygen Demand) value of sample becomes (1) more than 17ppm (2) equal to 10ppm (3) equal to 5ppm (4) less than 5ppm

Q46.Green house gases can be arranged in 'Global Warming Potential' sequence as (1) N2O > CFC > CH4 > CO2 (2) CFC > N2O > CH4 > CO2 (3) CFC > CO2 > N2O > CH4 (4) CO2 > CFC > N2O > CH4 JEE Main 2012 (07 May Online) JEE Main Previous Year Paper

Q46. Kf for water is 1.86 K kg mol−1 . If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C2H6O2) must you add to get the freezing point of the solution lowered to −2.8∘C ? (1) 72 g (2) 93 g (3) 39 g (4) 27 g

Q46.Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is 180pm, the size of ammonium ion would be (1) 174pm (2) 158pm (3) 142pm (4) 126pm

Q46.Among the following the incorrect statement is (1) Density of crystals remains unaffected due to (2) In BCC unit cell the void space is 32%. Frenkel defect. (3) Density of crystals decreases due to Schottky (4) Electrical conductivity of semiconductors and defect. metals increases with increase in temperature.

Q47.Among the following which is the best description of water in the solid phase? (1) Covalent solid (2) Molecular solid (3) Ionic solid (4) Network solid

Q47.The radius of a calcium ion is 94pm and of the oxide ion is 146pm. The possible crystal structure of calcium oxide will be (1) tetrahedral (2) trigonal (3) octahedral (4) pyramidal

Q47.The standard reduction potentials for Zn2+/Zn, Ni2+/Ni, and Fe2+/Fe are −0.76, −0.23 and −0.44 V respectively. The reaction X + Y2+ →X2+ + Y will be spontaneous when: (1) X = Ni, Y = Fe (2) X = Ni, Y = Zn (3) X = Fe, Y = Zn (4) X = Zn, Y = Ni

Q47.The freezing point of a 1.00 m aqueous solution of HF is found to be −1.91∘C. The freezing point constant of water, Kf is 1.86 K kg mol−1 . The percentage dissociation of HF at this concentration is (1) 30% (2) 10% (3) 5.2% (4) 2.7%

Q47.Liquids A and B form an ideal solution. At 30∘C, the total vapour pressure of a solution containing 1 mol of A and 2 mol of B is 250 mmHg . The total vapour pressure becomes 300 mmHg when 1 more mol of A is added to the first solution. The vapour pressures of pure A and B at the same temperature are (1) 150, 450mmHg (2) 125, 150 mmHg (3) 450, 150 mmHg (4) 250, 300 mmHg

Q48.For a first order reaction, (A) → products, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is : (1) 1.73 × 10−5M/min (2) 3.47 × 10−4M/min (3) 3.47 × 10−5M/min (4) 1.73 × 10−4M/min

Q48.A solution containing 0.85 g of ZnCl2 in 125.0 g of water freezes at −0.23∘C. The apparent degree of dissociation of the salt is (Kf for water = 1.86 K kg mol−1 , atomic mass: Zn = 65.3 and Cl = 35.5) (1) 1.36% (2) 73.5% (3) 7.35% (4) 2.47%

Q48.The standard potentials of Ag+/Ag, Hg2 2+/2Hg , Cu2+/Cu and Mg2+/Mg electrodes are 0.80, 0.79 , 0.34 and −2.37 V, respectively. An aqueous solution which contains one mole per litre of the salts of each of the four metals is electrolyzed. With increasing voltage, the correct sequence of deposition of the metals at the cathode is (1) Ag, Hg, Cu, Mg (2) Cu, Hg, Ag only (3) Ag, Hg, Cu only (4) Mg, Cu, Hg, Ag

Q48.A solid has a ' bcc ' structure. If the distance of nearest approach between two atoms is 1.73Å, the edge length of the cell is (1) 314.20pm (2) 1.41pm (3) 200pm (4) 216pm

Q48.Given E∘ = 0.34 V, E∘ = 0.15 V Cu2+/Cu Cu2+/Cu Standard electrode potential for the half cell Cu+/Cu is (1) 0.38 V (2) 0.53 V (3) 0.19 V (4) 0.49 V