Practice Questions

Q35.Which among the following purification methods is based on the principle of “Solubility” in two different solvents? (1) Column Chromatography (2) Sublimation (3) Distillation (4) Differential Extraction

Q35.Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C to Pb in a regular manner. (B) Electronegativity decreases from C to Pb down the group gradually. (C) Maximum covalance of C is 4 whereas other elements can expand their covalance due to presence of d orbitals. (D) Heavier elements do not form pπ −pπ bonds. (E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below : (1) (A), (B) and (C) Only (2) (C), (D) and (E) Only (3) (C) and (D) Only (4) (A) and (B) Only

Q35.The number of species from the following that have pyramidal geometry around the central atom is _______. S2O2−3 , SO2−4 , SO2−3 , S2O2−7 (1) 4 (2) 3 (3) 2 (4) 1

Q35. List - I List - II (Compound/Species) (Shape/Geometry) A. SF4 I. Tetrahedral Match List I with List II Choose the correct B. BrF3 II. Pyramidal C. BrO−3 III. See saw D. NH+4 +KS IV. Bent T-Shape answer from the options given below: (1) A-II, B-III, C-I, D-IV (2) A-II, B-IV, C-III, D-I (3) A-III, B-IV, C-II, D-I (4) A-III, B-II, C-IV, D-I

Q35.Solubility of calcium phosphate (molecular mass, M) in water is Wg per 100 mL at 25°C . Its solubility product at 25°C will be approximately. 3 5 (1) 107W (2) 107W M M 5 5 (3) 103W (4) 105W M M JEE Main 2024 (01 Feb Shift 2) JEE Main Previous Year Paper

Q35.Methods used for purification of organic compounds are based on : (1) nature of compound and presence of impurity. (2) neither on nature of compound nor on the impurity present. (3) nature of compound only. (4) presence of impurity only.

Q35.The ascending acidity order of the following H atoms is (1) C < D < B < A (2) A < B < C < D (3) A < B < D < C (4) D < C < B < A

Q35. KMnO4 decomposes on heating at 513 K to form O2 along with (1) MnO2 & K2O2 (2) K2 MnO4 & Mn (3) Mn & KO2 (4) K2 MnO4 & MnO2

Q35.Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following : (1) q = 0, ΔT ≠0, w = 0 (2) q = 0, ΔT < 0, w ≠0 (3) q ≠0, ΔT < 0, w = 0 (4) q = 0, ΔT = 0, w = 0

Q35.The incorrect statement regarding conformations of ethane is: (1) Ethane has infinite number of conformations (2) The dihedral angle in staggered conformation is 60° (3) Eclipsed conformation is the most stable (4) The conformations of ethane are interconvertible conformation. to one-another

Q35.The correct increasing order for bond angles among BF3, PF3 and ClF3 is : (1) BF3 < PF3 < ClF3 (2) ClF3 < PF3 < BF3 (3) PF3 < BF3 < ClF3 (4) BF3 = PF3 < ClF3

Q35.A species having carbon with sextet of electrons and can act as electrophile is called (1) carbon free radical (2) carbanion (3) carbocation (4) pentavalent carbon Q36.‘Adsorption’ principle is used for which of the following purification method? (1) Extraction (2) Chromatography (3) Distillation (4) Sublimation

Q35.Given below are two statements : Statement I : On passing HCl(g) through a saturated solution of BaCl2 , at room temperature white turbidity appears. Statement II : When HCl gas is passed through a saturated solution of NaCl, sodium chloride is precipitated due to common ion effect. 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) Statement I is correct but Statement II is incorrect (3) Both Statement I and Statement II are incorrect (4) Statement I is incorrect but Statement II is correct

Q35. Match List I with List II : Choose the correct answer from the options given below : (1) (A) - (IV), (B) - (III), (C) - (I), (D) - (II) (2) (A) - (I), (B) - (II), (C) - (IV), (D) - (III) (3) (A) - (III), (B) - (I), (C) - (II), (D) - (IV) (4) (A) - (II), (B) - (IV), (C) - (III), (D) - (I)

Q36.The correct statement among the following, for a "chromatography" purification method is : (1) Organic compounds run faster than solvent in the (2) Rf is an integral value. thin layer chromatographic plate. (3) Rf of a polar compound is smaller than that of a (4) Non-polar compounds are retained at top and non-polar compound. polar compounds come down in column chromatography.

Q36.Given below are two statements : Statement I: S8 solid undergoes disproportionation reaction under alkaline conditions to form S2 − and S2O32 − Statement II: ClO4− can undergo disproportionation reaction under acidic condition. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but statement II is (2) Statement I is incorrect but statement II is correct incorrect. (3) Both statement I and statement II are incorrect (4) Both statement I and statement II are correct JEE Main 2024 (31 Jan Shift 2) JEE Main Previous Year Paper

Q36.The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is: CH3CH2COOH, CH3COOH, CH3CH2CH2COOH, HCOOH JEE Main 2024 (08 Apr Shift 2) JEE Main Previous Year Paper (1) CH3CH2CH2COOH > CH3CH2COOH > CH3COOH > HCOOH (2) CH3COOH > CH3CH2COOH > CH3CH2CH2COOH > HCOOH (3) HCOOH > CH3COOH > CH3CH2COOH > CH3CH2CH2COOH (4) HCOOH > CH3CH2CH2COOH > CH3CH2COOH > CH3COOH

Q36. X ⇌Y; K1 = 1.0 For the given hypothetical reactions, the equilibrium constants are as follows : Y ⇌Z; K2 = 2.0 The Z ⇌W; K3 = 4.0 equilibrium constant for the reaction X ⇌W is (1) 6.0 (2) 12.0 (3) 7.0 (4) 8.0

Q36. List - I List - II (Molecule/Species) (Property/Shape) A. SO2Cl2 I. Paramagnetic Match List I with List II Choose the correct answer B. NO II. Diamagnetic C. NO−2 III. Tetrahedral D. I−3 IV. Linear from the options given below: (1) A-II, B-III, C-I, D-IV (2) A-III, B-I, C-II, D-IV (3) A-IV, B-I, C-III, D-II (4) A-III, B-IV, C-II, D-I

Q36.The correct stability order of carbocations is (1) + + + (2) + + + + CH33C+ > CH3 - CH2 > CH32 CH > CH3 CH3 > CH32 CH > CH3 - CH2 > CH33 C (3) + + + + (4) $\stackrel{+\quad} CH33 C > CH32 CH > CH3 - CH2 > CH3 {\mathrm{C}\mathrm{H}_3}>\mathrm{CH}_3- \stackrel{+ \quad}{\mathrm{C} \mathrm{H}_2}>\mathrm{CH}_3-\underset{| \atop \stackrel{ \atop }{\huge \mathrm{CH}_3}} {\stackrel{+ \quad}{\mathrm{C} \mathrm{H}}}>\left(\mathrm{CH}_3\right) \mathrm{C}^{+}$

Q36. Correct order of basic strength of Pyrrole , Pyridine , and Piperidine is: (1) Pyrrole > Piperidine > Pyridine (2) Pyrrole > Pyridine > Piperidine (3) Pyridine > Piperidine > Pyrrole (4) Piperidine > Pyridine > Pyrrole

Q36.The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal Fe2O3( s) + 3CO(g) ⇌Fe(l) + 3CO2( g) Using the Le-chatelier's principle, predict which one of the following will not disturb the equilibrium. (1) Addition of CO2 (2) Removal of CO2 (3) Addition of Fe2O3 (4) Removal of CO

Q36.Match List I with List II Choose the correct answer from the options given below: (1) A-I, B-II, C-III, D-IV (2) A-IV, B-I, C-II, D-III (3) A-III, B-IV, C-I, D-II (4) A-II, B-I, C-IV, D-III

Q36.Which of the following reactions are disproportionation reactions? 1 Cu+ →Cu2 + + Cu 2 3MnO42 - + 4H+ →2MnO4- + MnO2 + 2H2O 3 2KMnO4 →K2MnO4 + MnO2 + O2 4 2MnO4- + 3Mn2 + + 2H2O →5MnO2 + 4H+ Choose the correct answer from the options given below: (1) 1, 2 (2) 2, 3, 4 (3) 1, 2, 4 (4) 1, 4

Q36.The equilibrium constant for the reaction SO3(g) ⇌SO2( g) + 12 O2( g) is Kc = 4.9 × 10−2 . The value of Kc for the reaction given below is 2SO2( g) + O2( g) ⇌2SO3( g) is : (1) 4.9 (2) 49 (3) 41.6 (4) 416