Practice Questions

Q42.The isomeric deuterated bromide with molecular formula C4H8 DBr having two chiral carbon atoms is (1) 2-Bromo-1-deuterobutane (2) 2-Bromo-2-deuterobutane (3) 2-Bromo-3-deuterobutane (4) 2-Bromo-1-deutero-2-methylpropane

Q42.The correct relationships between unit cell edge length ‘a’ and radius of sphere ‘r’ for face-centred and body- centred cubic structures respectively are: (1) 2√2r = a and √3r = 4a (2) r = 2√2a and 4r = √3a (3) r = 2√2a and √3r = 4a (4) 2√2r = a and 4r = √3a

Q42.Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3 per mole of (X) and gives one mole each of ethanal and propanone is ______ g mol–1 (Molar mass of C : 12 g mol–1 , H : 1 g mol–1 )

Q42.Which will undergo deprotonation most readily in basic medium? (1) a only (2) c only (3) Both a and c (4) b only

Q42.The concentration of dissolved Oxygen in water for growth of fish should be more than X ppm and ¯ Biochemical Oxygen Demand in clean water should be less than Y ppm. X and Y in ppm are, respectively. ¯ (1) X Y (2) X Y 6 5 4 8 (3) X Y (4) X Y 4 15 6 12

Q42.For a good quality cement, the ratio of lime to the total of the oxides of Si, Al and Fe should be as close as to (1) 4 (2) 1 (3) 2 (4) 3

Q42.Given below are two statements : Statement-I : Methane and steam passed over a heated Ni catalyst produces hydrogen gas. JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper Statement-II : Sodium nitrite reacts with NH4Cl to give H2O, N2 and NaCl. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Statement I is incorrect but Statement II is (2) Both the statements I and II are incorrect correct (3) Statement I is correct but Statement II is (4) Both the statements I and II are correct incorrect

Q42.The number of possible isomeric products formed when 3 -chloro- 1 -butene reacts with HCl through carbocation formation is.........

Q42.Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II: Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below (1) Both Statement I and Statement II are incorrect (2) Statement I is correct but Statement II is incorrect (3) Both statement I and Statement II are correct (4) Statement I is incorrect but Statement II is correct

Q42.Given below are two statements related to Ellingham diagram : Statement I : Ellingham diagrams can be constructed for formation of oxides, sulphides and halides of metals. Statement II : It consists of plots of ΔH° vs T for formation of oxides of elements. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect (3) Statement I is correct but Statement II is incorrect(4) Statement I is incorrect but Statement II is correct

Q42.Which one of the following is not an example of calcination? (1) CaCO3 Δ→CaO + CO2 (2) Fe2 O3. xH2 O Δ→Fe2 O3 + xH2 O (3) (4) 2PbS + 3O2 Δ→2PbO + 2 SO2 CaCO3. MgCO3 Δ→CaO + MgO + 2 CO2

Q43.Given below are two statements : Statement I : under Clemmensen reduction conditions will give Statement II : under Wolff-Kishner reduction condition will give In the light of the above statements, choose the correct answer from the options given below : (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are false (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are true

Q43.Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to (1) Prevent hydrolysis (2) Prevent reduction (3) Prevent breaking (4) Prevent oxidation

Q43.Match List-I with . List-I List-II Name of reaction Reagent used A Hell-Volhard Zelinsky reaction I NaOH + I2 B Iodoform reaction II ( i ) CrO2Cl2, CS2 ( ii ) H2O C Etard reaction III ( i ) Br2 / red phosphorus ( ii ) H2O D Gatterman-Koch reaction IV CO, HCl, anhyd . AlCl3 Choose the correct answer from the options given below: JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper (1) A →III; B →I; C →II; D →IV (2) A →I; B →II; C →III; D →IV (3) A →III; B →II; C →I; D →IV (4) A →III; B →I; C →IV; D →II

Q43.Which of the following complex will show largest splitting of d-orbitals? (1) FeC2O43 3 - (2) FeF6 3 - (3) Fe ( CN 3 - (4) 3 + ) 6 FeNH36

Q43.Following chromatogram was developed by adsorption of compound ' A ' on a 6 cm TLC glass plate. Retardation factor of the compound ' A' is _____ ×10−1 . Q44. 17 mg of a hydrocarbon (M.F. C10H16 ) takes up 8. 40 mL of the H2 gas measured at 0°C and 760 mm of Hg. Ozonolysis of the same hydrocarbon yields CH3 −C −CH3, H −C −H, H −C −CH2 −CH2 −C −C −H || || || || || O O O O O The number of double bond/s present in the hydrocarbon is

Q43.Nd2 + = ______ (1) 4f26s2 (2) 4f4 (3) 4f3 (4) 4f46s2

Q43.The osmotic pressure of solutions of PVC in cyclohexanone at 300 K are plotted on the graph. The molar mass of PVC is g mol−1 (Nearest integer) (Given : R = 0. 083 L atm K−1 mol−1 )

Q43.The strongest acid from the following is (1) (2) (3) (4)

Q43.The number of P −O −P bonds in H4P2O7, (HPO3)3 , and P4O10 are respectively (1) 0, 3, 6 (2) 0, 3, 4 (3) 1, 2, 4 (4) 1, 3, 6

Q43.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can be easily reduced using Zn −Hg / HCl to Reason R: Zn −Hg / HCl is used to reduce carbonyl group to – CH2 – group. In the light of the above statements, choose the correct answer from the options given below: (1) A is false but R is true (2) A is true but R is false (3) Both A and R are true but R is not the correct (4) Both A and R are true and R is the correct explanation of A explanation of A

Q43.The magnetic moment of a transition metal compound has been calculated to be 3 . 87 BM. The metal ion is (1) Cr2 + (2) Mn2 + (3) V2 + (4) Ti2 +

Q43.In Dumas method for the estimation of N2 , the sample is heated with copper oxide and the gas evolved is passed over: (1) Copper gauze (2) Pd (3) Ni (4) Copper oxide

Q43.Correct statements for the given reaction are: JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper A. Compound ‘ B ’ is aromatic B. The completion of above reaction is very slow C. ‘ A ’ shows tautomerism D. The bond lengths of C −C in compound B are found to be same Choose the correct answer from the options given below. (1) B, C and D only (2) A, B and C only (3) A, C and D only (4) A, B and D only

Q43. Be(OH)2 reacts with Sr(OH)2 to yield an ionic salt. Choose the incorrect option related to this reaction from the following (1) Both Sr and Be elements are present in the ionic (2) Beis tetrahedrally coordinated in the ionic salt salt (3) The element Be is present in the cationic part of (4) The reaction is an example of acid-base the ionic salt neutralization reaction