Practice Questions

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. 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.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.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.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.Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always −57 kJ mol−1 . Reason (R) : Enthalpy of neutralisation is the amount of heat liberated when one mole of H+ ions furnished by acid combine with one mole of OH− ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below. JEE Main 2024 (05 Apr Shift 1) JEE Main Previous Year Paper (1) (A) is true but (R) is false (2) Both (A) and (R) are true but (R) is not the correct explanation of (A) (3) Both (A) and (R) are true and (R) is the correct (4) (A) is false but (R) is true explanation of (A)

Q35.Given below are two statements : Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities. Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by H2CO3/HCO−3 Θ concentrations. In the light of the above statements, choose the correct answer from the options given below : (1) Statement I is true but Statement II is false (2) Both Statement I and Statement II are true (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are false

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.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

Q36.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Melting point of Boron (2453 K) is unusually high in group 13 elements. Reason (R) : Solid Boron has very strong crystalline lattice. In the light of the above statements, choose the most appropriate answer from the options given below ; (1) Both (A) and (R) are correct but (R) Is not the (2) Both (A) and (R) are correct and (R) is the correct explanation of (A) correct explanation of (A) (3) (A) is true but (R) is false (4) (A) is false but (R) is true

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.Given below are two statements : Statement I : The electronegativity of group 14 elements from Si to Pb gradually decreases. Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements. In the light of the above statements, choose the most appropriate from the options given below : (1) Statement I is false but Statement II is true (2) Statement I is true but Statement II is false (3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false

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.The correct statements from the following are : (A) The decreasing order of atomic radii of group 13 elements is Tl > In > Ga > Al > B . (B) Down the group 13 electronegativity decreases from top to bottom. (C) Al dissolves in dil. HCl and liberates H2 but conc. HNO3 renders Al passive by forming a protective oxide layer JEE Main 2024 (05 Apr Shift 2) JEE Main Previous Year Paper on the surface. (D) All elements of group 13 exhibits highly stable +1 oxidation state. (E) Hybridisation of Al in [Al(H2O)6]3+ ion is sp3 d2 . Choose the correct answer from the options given below : (1) (A), (C) and (E) only (2) (A) and (C) only (3) (C) and (E) only (4) (A), (B), (C) and (E) only

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.Which of the following nitrogen containing compound does not give Lassaigne's test? JEE Main 2024 (04 Apr Shift 1) JEE Main Previous Year Paper (1) Urea (2) Phenyl hydrazine (3) Glycene (4) Hydrazine

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. 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.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

Q37.Which one of the following will show geometrical isomerism? JEE Main 2024 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37.Among the following halogens F2, Cl2, Br2 and I2 Which can undergo disproportionation reactions? (1) F2, Cl2 and Br2 (2) F2 and Cl2 (3) Only I2 (4) Cl2, Br2 and I2

Q37.Product A and B formed in the following set of reactions are: (1) (2) (3) (4)

Q37.The correct nomenclature for the following compound is : (1) 2-formyl-4-hydroxyhept-7-enoic acid (2) 2-formyl-4-hydroxyhept-6-enoic acid (3) 2-carboxy-4-hydroxyhept-7-enal (4) 2-carboxy-4-hydroxyhept-6-enal

Q37.The number of neutrons present in the more abundant isotope of boron is ' x '. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ' y '. The value of x + y is _______ (1) 3 (2) 9 (3) 4 (4) 6

Q37.The final product A, formed in the following reaction sequence is: (1) Ph - CH2 - CH2 - CH3 (2) (3) (4) Ph - CH2 - CH2 - CH2 - OH