Practice Questions

Q45.The following molecule acts as an : (1) Antiseptic (2) Anti–depressant (3) Anti–bacterial (4) Anti–histamine

Q45.Which one of the following statement is not true? JEE Main 2020 (06 Sep Shift 2) JEE Main Previous Year Paper (1) Lactose contains α−glycosidic linkage between (2) Lactose is a reducing sugar and it gives Fehling's C1 of galactose and C4 of glucose test. (3) Lactose (C11H22O11) is a disaccharide and it (4) On acid hydrolysis, lactose gives one molecule contains 8 hydroxyl groups. of D(+)−glucose and one molecule of D(+)− galactose.

Q45.Match the following drugs with their therapeutic actions: (i) Ranitidine (a) Antidepressant (ii) Nardil (Phenelzine) (b) Antibiotic (iii) Chloramphenicol (c) Antihistamine (iv) Dimetane (Brompheniramine) (d) Antacid (e) Analgesic (1) (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e); (2) (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c); (3) (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d); (4) (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e); Q46. 0. 023 × 1022 molecules are present in 10gof a substance ′x′. The molarity of a solution containing 5g of substance 'x' in 2 L solution is _________ ×10−3

Q45.For the following Assertion and Reason, the correct option is: Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7 −9 elements. Reason: The reactants are most strongly adsorbed on group 7 −9 elements. (1) The assertion is true, but the reason is false (2) Both assertion and reason are false (3) Both assertion and reason are true and the reason (4) Both assertion and reason are true but the reason is the correct explanation for the assertion is not the correct explanation for the assertion

Q45.The antifertility drug "Novestrol" can react with : (1) ZnCl2 / HCl; FeCl3; Alcoholic HCN (2) Br2 / water, ZnCl2 / HCl; FeCl3 (3) Alcoholic HCN; NaOCl; ZnCl2 / HCl (4) Br2 / water, ZnCl2 / HCl; NaOCl

Q45.What are the functional groups present in the structure of maltose? (1) One ketal and one hemiketal (2) Two acetals (3) One acetal and one hemiacetal (4) One acetal and one ketal JEE Main 2020 (04 Sep Shift 1) JEE Main Previous Year Paper

Q46.The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3g of [Co(NH3)6]Cl3 is __________. M[Co(NH3)6]Cl3 = 267.46g/mol MAgNO3 = 169.87g/mol Report the nearest integer as the answer.

Q46.A spherical balloon of radius 3 cm containing helium gas has a pressure of 48 × 10−3 bar. At the same temperature, the pressure, of a spherical balloon of radius 12 cm containing the same amount of gas will be … … … … . ×10−6 bar.

Q46.The standard heat of formation (ΔfH 298)0 of ethane (in kJ/mol ), if the heat of combustion of ethane, hydrogen and graphite are −1560, −393.5 and −286 kJ/mol , respectively is ________ Q47. 3 g of acetic acid is added to 250 mL of 0.1 M HCl and the solution made up to 500 mL. To 20 mL of this solution 1 mL of 5M NaOH is added. The pH of the solution is ________ 2 [Given: pKa of acetic acid = 4.75, molar mass of acetic acid 60 g/mol, log 3 = 0.4771 , Neglect any changes in volume]

Q46.The ratio of the mass percentages of ' C & H ' and ' C & O' of a saturated acyclic organic compound ' X ' are 4 : 1 and 3 : 4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound ' X' is_______

Q46.For the reaction; A(l) →2B(g) ΔU = 2.1kcal, ΔS = 20calK−1 at 300K. Hence ΔG in kcal is _____________.

Q46.The mole fraction of glucose (C6H12O6) in an aqueous binary solution is 0. 1. The mass percentage of water in it, to the nearest integer, is … … … JEE Main 2020 (03 Sep Shift 1) JEE Main Previous Year Paper

Q46.A 100 mL solution was made by adding 1. 43 g of Na2 CO3. xH2 O. The normality of the solution is 0. 1 N. The value of x is _______ (The atomic mass of Na is 23g/ mol)

Q46.The Gibbs energy change (in J) for the given reaction at [Cu2+] = [Sn2+] = 1 M and 298 K is : Cu(s) + Sn2+(aq. ) →Cu2+(aq. ) + Sn(s); = −0 .16 V, E0 = 0 .34 V,Take F = 96500 C mol−1) Cu2+ Cu (E0Sn2+|Sn

Q46. NaClO3 is used, even in spacecrafts, to produce O2. The daily consumption of pure O2 by a person in 492 L at 1 atm, 300K. How much amount of NaClO3, in grams, is required to produce O2 for the daily consumption of a person at 1 atm, 300K ? _____ NaClO3(s) + Fe(s) →O2(g) + NaCl(s) + FeO(s) R = 0 .082 L atm mol−1 K−1

Q46.The mass of ammonia in grams produced when 2. 8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is _____

Q46.A soft drink was bottled with a partial pressure of CO2 of 3 bar over the liquid at room temperature. The partial pressure of CO2 over the solution approaches a value of 30 bar when 44 g of CO2 is dissolved in 1 kg of water at room temperature. The approximate pH of the soft drink is ___________ ×10−1 . (First dissociation constant of H2 CO3 = 4. 0 × 10−7; log 2 = 0. 3; density of the soft drink = 1 g mL−1 ) JEE Main 2020 (05 Sep Shift 1) JEE Main Previous Year Paper

Q46.The atomic number of Unnilumium is ______.

Q46.The molarity of HNO3 in a sample which has density 1.4 g/mL and mass percentage of 63% is ________ (Molecular Weight of HNO3 = 63 ) JEE Main 2020 (09 Jan Shift 1) JEE Main Previous Year Paper

Q46.For a dimerization reaction, JEE Main 2020 (05 Sep Shift 2) JEE Main Previous Year Paper 2A(g) →A2(g) at 298K, ΔU−= −20 kJmol−1, ΔS−= −30 JK−1 mol−1,then the ΔG− will be …..J.

Q47.In an estimation of bromine by Carius method, 1. 6g of an organic compound gave 1. 88g of AgBr. The mass percentage of bromine in the compound is … . . (Atomic mass, Ag = 108, Br = 80 gmol−1

Q47.The work function of sodium metal is 4. 41 × 10−19J. If photons of wavelength 300 nm are incident on the metal, the kinetics energy of the ejected electrons will be (h = 6. 63 × 10−34J s; c = 3 × 108 m s−1) __________ ×10−21J

Q47.Two solutions, A and B, each of 100L was made by dissolving 4g of NaOH and 9.8g of H2SO4 in water, respectively. The pH of the resultant solution obtained from mixing 40L of solution A and 10L of solution B is ____________. (log 2 = 0. 3)

Q47.The internal energy change (in J) when 90 g of water undergoes complete evaporation at 100°C is .............. (Given : ΔHvap for water at 373 K = 41 kJ / mol, R = 8. 314 JK−1 mol−1 )

Q47.The hardness of a water sample containing 10−3 M MgSO4 expressed as CaCO3 equivalents (in ppm ) is . (molar mass of MgSO4 is 120.37 g/mol )