Practice Questions

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 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.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.When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral FeCl3, it gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains (1) SO32 - &CH3COO- (2) CH3COO-&NO3- (3) SO32 - &C2O42 - (4) C2O42 - &NO3-

Q43.Ferric chloride is applied to stop bleeding because (1) Blood absorbs FeCl3 and forms a complex. (2) Cl-ions cause coagulation of blood. (3) Fe3 + ions coagulate blood which is a negatively (4) FeCl3 reacts with the constituents of blood which charged sol. is a positively charged sol.

Q43.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A: Sodium is about 30 times as abundant as potassium in the oceans. Reason R : Potassium is bigger in size than sodium. In the light of the above statements, choose the correct answer from the options given below (1) Both A and R are true and R is the correct (2) A is true but R is false explanation of A (3) Both A and R are true but R is NOT the correct (4) Both A and R are false explanation of A

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.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

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.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.To inhibit the growth of tumours, identify the compounds used from the following: (A) EDTA (B) Coordination Compounds of Pt (C) D-Penicillamine (D) Cis - Platin Choose the correct answer from the option given below: (1) B and D Only (2) C and D Only (3) A and B Only (4) A and C Only

Q43.What is the mass ratio of ethylene glycol ( C2H6O2 , molar mass = 62 g/ mol) required for making 500 g of 0. 25 molal aqueous solution and 250 mL of 0. 25 molar aqueous solution? (1) 1 : 1 (2) 3 : 1 (3) 2 : 1 (4) 1 : 2

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.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.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.Match List I with List II List-I List-2 Species Maximum allowed concentration in ppm in drinking water A F− I < 50 ppm JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper B SO2−4 II < 5 ppm C NO−3 III < 2 ppm D Zn IV < 500 ppm Choose the correct answer from the options given below. (1) A-I, B-II, C-III, D-IV (2) A-II, B-I, C-III, D-IV (3) A-IV, B-III, C-II, D-I (4) A-III, B-II, C-I, D-IV

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

Q43.A metal M forms hexagonal close-packed structure. The total number of voids in 0. 02 mol of it is _____ ×1021 (Nearest integer) (Given NA = 6. 02 × 1023 )

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 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

Q44.Three organic compounds A, B and C were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The Rf value of the most polar compound is _____ ×10–2

Q44.The industrial activity held least responsible for global warming is : (1) manufacturing of cement (2) steel manufacturing (3) Electricity generation in thermal power plants. (4) Industrial production of urea

Q44.The primary and secondary valencies of cobalt respectively in Co ( NH3 ) 5ClCl2 are: (1) 3 and 5 (2) 2 and 6 (3) 2 and 8 (4) 3 and 6

Q44.The group of chemicals used as pesticide is (1) Aldrin, Sodium Chlorate, Sodium arsinite (2) DDT, Aldrin (3) Sodium chlorate, DDT, PAN (4) Dieldrin, Sodium arsinite, Tetrachloroethene

Q44.The descending order of acidity for the following carboxylic acid is- (A) CH3 COOH (B) F3C −COOH JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper (C) ClCH2 −COOH (D) FCH2 −COOH (E) BrCH2 −COOH Choose the correct answer from the options given below: (1) B > C > D > E > A (2) E > D > B > A > C (3) B > D > C > E > A (4) D > B > A > E > C