Practice Questions

Q42.Compound that will give positive Lassaigne's test for both nitrogen and halogen is (1) N2H4 ⋅HCl (2) CH3 NH2. HCl (3) NH4 Cl (4) NH2 OH. HCl

Q42.Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone is ____________. Q43. ‘ X ’ is: JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.Match List I with List II List I List II Oxide Type of bond A N2O4 I 1 N = O bond B NO2 II 1 N – O – N bond C N2O5 III 1 N – N bond D N2O IV 1 N = N / N ≡ N bond Choose the correct answer from the options given below : (1) A - III, B - I, C - II, D - IV (2) A - II, B - IV, C - III, D - I (3) A - III, B - I, C - IV, D - II (4) A - II, B - I, C - III, D - IV

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

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 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.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.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.Highest oxidation state of Mn is exhibited in Mn2O7. The correct statements about Mn2O7 are (A) Mn is tetrahedrally surrounded by oxygen atoms (B) Mn is octahedrally surrounded by oxygen atoms (C) Contains Mn - O - Mn bridge (D) Contains Mn - Mn bond. Choose the correct answer from the options given below (1) A and C only (2) A and D only (3) B and D only (4) B and C only

Q42.Which of the following is correct order of ligand field strength? (1) CO < en < NH3 < C2O42 - < S2 - (2) S2 - < C2O42 - < NH3 < en < CO (3) NH3 < en < CO < S2 - < C2O42 - (4) S2 - < NH3 < en < CO < C2O42 -

Q42.A cubic solid is made up of two elements X and Y. Atoms of X are present on every alternate corner and one at 1 rd the center of cube. Y is at 3 of the total faces. The empirical formula of the compound is (1) X2Y1.5 (2) X1.5Y (3) XY2.5 (4) X1.5Y2

Q42.The Lewis acid character of boron tri halides follows the order: (1) BCl3 > BF3 > BBr3 > Bl3 (2) Bl3 > BBr3 > BCl3 > BF3 (3) BBr3 > Bl3 > BCl3 > BF3 (4) BF3 > BCl3 > BBr3 > Bl3

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 correct order of basicity of oxides of vanadium is JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper (1) V2O3 > V2O4 > V2O5 (2) V2O3 > V2O5 > V2O4 (3) V2O5 > V2O4 > V2O3 (4) V2O4 > V2O3 > V2O5

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.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: 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.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.Given below are two statements: Statement I : Aqueous solution of K2Cr2O7 is preferred as a primary standard in volumetric analysis over Na2Cr2O7 aqueous solution. Statement II : K2Cr2O7 has a higher solubility in water than Na2Cr2O7. 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 true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false

Q42.From the figure of column chromatography given below, identify incorrect statements. JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper A . Compound ‘ c’ is more polar than ‘ a ’ and ‘ b ’ B. Compound ‘ a ’ is least polar C. Compound ‘ b’ comes out of the column before ‘ c’ and after ‘ a ’ D . Compound ‘ a ’ spends more time in the column Choose the correct answer from the options given below (1) A, B and D only (2) A, B and C only (3) B and D only (4) B, C and D 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.Match List I with List II: List II List I (Mixture) (Separation Technique) (A) CHCl3 + C6H5 NH2 I Steam distillation JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper Differential (B) C6H14 + C5H12 II extraction (C) C6H5 NH2 + H2O III Distillation Fractional (D) Organic compound in H2O IV distillation (1) A-IV, B-I, C-III, D-II (2) A-III, B-IV, C-I, D-II (3) A-II, B-I, C-III, D-IV (4) A-III, B-I, C-IV, D-II

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

Q43.The correct group of halide ions which can be oxidised by oxygen in acidic medium is (1) Br– and I– only (2) Br– only (3) I– only (4) Cl– , Br– and I– only

Q43.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R . Assertion A: can be subjected to Wolff-Kishner reduction to give Reason R: Wolff-Kishner reduction is used to convert into In the light of the above statements, choose the correct answer from the options given below: (1) A is true but R is false (2) A is false but R is true (3) Both A and R are true and R is the correct (4) Both A and R are true and R is NOT the correct explanation of A explanation of A