Practice Questions

Q34.Which of the following relations are correct? (A) ΔU = q + pΔV (B) ΔG = ΔH −TΔS (C) ΔS = qrevT (D) ΔH = ΔU −ΔnRT Choose the most appropriate answer from the options given below : (1) C and D only (2) B and C only (3) A and B only (4) B and D only

Q34.During water-gas shift reaction (1) Carbon monoxide is oxidized to carbon dioxide. (2) Water is evaporated in presence of catalyst. (3) Carbon is oxidized to carbon monoxide. (4) Carbon dioxide is reduced to carbon monoxide.

Q34.Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Butan– 1–ol has higher boiling point than ethoxyethane. Reason R : Extensive hydrogen bonding leads to stronger association of molecules. 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) Both A and R are true and R is the correct explanation of A (3) Both A and R are true but R is not the correct (4) A is false but R is true explanation of A

Q34.The correct order of metallic character is (1) K > Be > Ca (2) Be > Ca > K (3) Ca > K > Be (4) K > Ca > Be

Q34.Match Column I with Column II Column I Column II A Soda ash I CaSO4 B Chlorophyll II CaOH2 C Used in Whitewashing III Na2CO3 D Dentistry, ornamental work IV Mg2 + ions (1) A – III, B – IV, C – I, D – II (2) A – II, B – I, C – III, D – IV (3) A – III, B – I, C – II, D – IV (4) A – II, B – III, C – IV, D – I

Q34.The alkaline earth metal sulphate(s) which are readily soluble in water is/are: (A) BeSO4 (B) MgSO4 (C) CaSO4 (D) SrSO4 (E) BaSO4 Choose the correct answer from the options given below: (1) A only (2) B only (3) A and B (4) B and C

Q35.In an ice crystal, each water molecule is hydrogen bonded to _____ neighbouring molecules.

Q35.Lithium aluminium hydride can be prepared from the reaction of (1) LiCl and Al2H6 (2) LiH and Al2Cl6 (3) LiCl, Al and H2 (4) LiH and AlOH3

Q35.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reactions. Reason R: Isotopes of hydrogen have different enthalpy of bond dissociation. 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 correct explanation of A explanation of A (3) A is not correct but R is correct (4) A is correct but R is not correct

Q35.The setting time of Cement is increased by adding (1) Clay (2) Silica (3) Gypsum (4) Limestone

Q36.Match List I with List II List I List II A. Cobalt catalyst I. (H2 + Cl2) production B. Syngas II. Water gas production C. Nickel catalyst III. Coal gasification D. Brine solution IV. Methanol production Choose the correct answer from the options given below:- JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper (1) A-IV, B-I, C-II, D-III (2) A-IV, B-III, C-I, D-II (3) A-II, B-III, C-IV, D-I (4) A-IV, B-III, C-II, D-I

Q36.How can photochemical smog be controlled? (1) By using tall chimneys (2) By complete combustion of fuel (3) By using catalytic converters in (4) By using catalyst the automobiles/industry

Q36.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : An aqueous solution of KOH when for volumetric analysis, its concentration should be checked before the use. Reason (R) : On aging, KOH solution absorbs atmospheric CO2 . In the light of the above statements, choose the correct answer from the options given below. (1) (A) is not correct but (R) is correct (2) Both (A) and (R) are correct but (R) is not the correct explanation of (A) (3) Both (A) and (R) are correct and (R) is the (4) (A) is correct but (R) is not correct correct explanation of (A)

Q36.The total number of intensive properties from the following is........... Volume, Molar heat capacity, molarity, Eocell ,Gibbs free energy change, Molar mass, Mole Q37. 4. 5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel.At equilibrium, 3 moles of HI were found. The equilibrium constant for H2(g) + I2(g) ⇌2 HI(g) is ........

Q36.For a good quality cement, the ratio of silica to alumina is found to be (1) 1. 5 (2) 4. 5 (3) 2 (4) 3

Q37.Millimoles of calcium hydroxyide required to produce 100 mL of the aqueous solution of pH 12 is x × 10−1 . The value of x is _____ (Nearest integer). Assume complete dissociation.

Q37.Which of the following is true about freons? (1) These are chlorofluorocarbon compounds (2) These are chemicals causing skin cancer (3) These are radicals of chlorine and chlorine (4) All radicals are called freons monoxide

Q37.Which of the following conformations will be the most stable? JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37.Number of water molecules in washing soda and soda ash respectively are : JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper (1) 1 and 10 (2) 10 and 1 (3) 10 and 0 (4) 1 and 0

Q37.The possibility of photochemical smog formation is more at (1) Marshy lands (2) Industrial areas (3) Himalayan villages in winter (4) The places with healthy vegetation JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper

Q37.Lime reacts exothermally with water to give ‘A’ which has low solubility in water. Aqueous solution of ‘A’ is often used for the test of CO2, a test in which insoluble B is formed. If B is further reacted with CO2 then soluble compound is formed. ‘A' is (1) Quick lime (2) Slaked lime (3) White lime (4) Lime water

Q38.An analyst wants to convert 1 L HCl of pH = 1 to a solution of HCl of pH = 2. The volume of water needed to do this dilution is _____ mL. (Nearest integer)

Q38.Which of the given compounds can enhance the efficiency of hydrogen storage tank? (1) Li /P4 (2) SiH4 (3) NaNi5 (4) Di-isobutylaluminium hydride

Q38.Which one among the following metals is the weakest reducing agent? (1) K (2) Rb (3) Na (4) Li

Q39.The volume of 0. 02 M aqueous HBr required to neutralize 10. 0 mL of 0. 01 M aqueous Ba(OH)2 is (Assume complete neutralization) (1) 2. 5 mL (2) 5. 0 mL (3) 10. 0 mL (4) 7. 5 mL