Practice Questions

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.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)

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

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.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.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.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.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

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

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)

Q39.Formation of photochemical smog involves the following reaction in which A, B and C are respectively. hu (i) NO2 ⟶A + B JEE Main 2023 (30 Jan Shift 1) JEE Main Previous Year Paper (ii) B + O2 →C (iii) A + C →NO2 + O2 Choose the correct answer from the options given below: (1) O, NO and NO3- (2) O, N2O and NO (3) N, O2 and O3 (4) NO, O and O3

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

Q40.The correct order of hydration enthalpies is (A) K+ (B) Rb+ (C) Mg2+ JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper (D) Cs+ (E) Ca2+ Choose the correct answer from the options given below: (1) C > A > E > B > D (2) E > C > A > B > D (3) C > E > A > D > B (4) C > E > A > B > D

Q40.Ion having highest hydration enthalpy among the given alkaline earth metal ions is: (1) Be2+ (2) Sr2+ (3) Ba2+ (4) Ca2+

Q40.The element playing significant role in neuromuscular function and interneuronal transmission is : (1) Be (2) Mg (3) Ca (4) Li

Q40. Mg (NO3)2. XH2 O and Ba (NO3)2. YH2 O, represent formula of the crystalline forms of nitrate salts. Sum of X and Y is.......

Q40.Match List I with List II List I Industry List II Waste Generated (A) Steel plants (I) Gypsum (B) Thermal power plants (II) Fly ash (C) Fertilizer Industries (III) Slag (D) Paper mills (IV) Bio-degradable wastes Choose the correct answer from the options given below : (1) A - III, B - II, C - I, D - IV (2) A - III, B - IV, C - I, D - II (3) A - II, B - III, C - IV, D - I (4) A - IV, B - I, C - II, D - III

Q40.Match List I with List II LIST I – Enzymatic reaction LIST II - Enzyme A Sucrose→ Glucose and Fructose I Zymase B Glucose → ethyl alcohol and CO2 II Pepsin C Starch → Maltose III Invertase D Proteins → Amino acids IV Diastase Choose the correct answer from the options given below. (1) A - I, B - II, C - IV, D - III (2) A - III, B - I, C - IV, D - II (3) A - III, B - I, C - II, D - IV (4) A - I, B - IV, C - III, D - II

Q41.During the borax bead test with CuSO4 , a blue green colour of the bead was observed in oxidising flame due to the formation of (1) Cu3 B2 (2) Cu (3) Cu (BO2)2 (4) CuO

Q41.A solution of FeCl3 when treated with K4Fe ( CN ) gives a prussian blue precipitate due to the formation of 6 (1) KFe2 ( CN ) (2) FeFe ( CN ) 6 6 (3) Fe3Fe ( CN ) (4) Fe4Fe ( CN ) 62 63

Q41.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect. Reason R : The light scatters in all directions when the size of particles is large enough. In the light of the above statements, choose the correct answer from the options given below : JEE Main 2023 (13 Apr Shift 2) JEE Main Previous Year Paper (1) Both A and R are correct but R is NOT the (2) A is true but R is false correct explanation of A (3) A is false but R is true (4) Both A and R are correct and R is the correct explanation of A

Q41.In the extraction process of copper, the product obtained after carrying out the reactions (i) 2Cu2 S + 3O2 ⟶2Cu2O + 2SO2 (ii) 2Cu2O + Cu2 S ⟶6Cu + SO2 is called (1) Blister copper (2) Reduced copper (3) Copper scrap (4) Copper matte

Q41.During the qualitative analysis of SO32 - using dilute H2SO4, SO2 gas is evolved which turns K2Cr2O7 solution (acidified with dilute H2SO4): (1) Black (2) Red (3) Green (4) Blue

Q41.What is the purpose of adding gypsum to cement? (1) To facilitate the hydration of cement (2) To slow down the process of setting (3) To give a hard mass (4) To speed up the process of setting