Practice Questions

Q41.The difference between electron gain enthalpies will be maximum between : (1) Ne and F (2) Ar and F (3) Ne and Cl (4) Ar and Cl

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.An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is : (1) 𝐶𝑢2 + (2) 𝑁𝑖2 + (3) 𝐹𝑒2 + (4) Co2 +

Q41.The density of alkali metals is in the order (1) K < Cs < Na < Rb (2) Na < Rb < K < Cs (3) Na < K < Cs < Rb (4) K < Na < Rb < Cs

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

Q41.When Cu2 + ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y respectively are (1) X = Cu2I2, Y = Na2S4O5 (2) X = Cu2I2, Y = Na2S4O6 (3) X = CuI2, Y = Na2S4O3 (4) X = CuI2, Y = Na2S4O6

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

Q42.Match List I with List II: List II List I (Mixture) (Separation Technique) (A) CHCl3 + C6H5 NH2 I Steam distillation JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper Differential (B) C6H14 + C5H12 II extraction (C) C6H5 NH2 + H2O III Distillation Fractional (D) Organic compound in H2O IV distillation (1) A-IV, B-I, C-III, D-II (2) A-III, B-IV, C-I, D-II (3) A-II, B-I, C-III, D-IV (4) A-III, B-I, C-IV, D-II

Q42.Which of the Phosphorus oxoacid can create silver mirror from AgNO3 solution? (1) HPO3n (2) H4P2O5 (3) H4P2O6 (4) H4P2O7

Q42.Highest oxidation state of Mn is exhibited in Mn2O7. The correct statements about Mn2O7 are (A) Mn is tetrahedrally surrounded by oxygen atoms (B) Mn is octahedrally surrounded by oxygen atoms (C) Contains Mn - O - Mn bridge (D) Contains Mn - Mn bond. Choose the correct answer from the options given below (1) A and C only (2) A and D only (3) B and D only (4) B and C only

Q42.Which of the following is correct order of ligand field strength? (1) CO < en < NH3 < C2O42 - < S2 - (2) S2 - < C2O42 - < NH3 < en < CO (3) NH3 < en < CO < S2 - < C2O42 - (4) S2 - < NH3 < en < CO < C2O42 -

Q42.For a good quality cement, the ratio of lime to the total of the oxides of Si, Al and Fe should be as close as to (1) 4 (2) 1 (3) 2 (4) 3

Q42.Which will undergo deprotonation most readily in basic medium? (1) a only (2) c only (3) Both a and c (4) b only

Q42.Which one of the following is not an example of calcination? (1) CaCO3 Δ→CaO + CO2 (2) Fe2 O3. xH2 O Δ→Fe2 O3 + xH2 O (3) (4) 2PbS + 3O2 Δ→2PbO + 2 SO2 CaCO3. MgCO3 Δ→CaO + MgO + 2 CO2

Q42.Match List I with List II List I List II Oxide Type of bond A N2O4 I 1 N = O bond B NO2 II 1 N – O – N bond C N2O5 III 1 N – N bond D N2O IV 1 N = N / N ≡ N bond Choose the correct answer from the options given below : (1) A - III, B - I, C - II, D - IV (2) A - II, B - IV, C - III, D - I (3) A - III, B - I, C - IV, D - II (4) A - II, B - I, C - III, D - IV

Q42.The isomeric deuterated bromide with molecular formula C4H8 DBr having two chiral carbon atoms is (1) 2-Bromo-1-deuterobutane (2) 2-Bromo-2-deuterobutane (3) 2-Bromo-3-deuterobutane (4) 2-Bromo-1-deutero-2-methylpropane

Q42.The concentration of dissolved Oxygen in water for growth of fish should be more than X ppm and ¯ Biochemical Oxygen Demand in clean water should be less than Y ppm. X and Y in ppm are, respectively. ¯ (1) X Y (2) X Y 6 5 4 8 (3) X Y (4) X Y 4 15 6 12

Q42.A cubic solid is made up of two elements X and Y. Atoms of X are present on every alternate corner and one at 1 rd the center of cube. Y is at 3 of the total faces. The empirical formula of the compound is (1) X2Y1.5 (2) X1.5Y (3) XY2.5 (4) X1.5Y2

Q42.The Lewis acid character of boron tri halides follows the order: (1) BCl3 > BF3 > BBr3 > Bl3 (2) Bl3 > BBr3 > BCl3 > BF3 (3) BBr3 > Bl3 > BCl3 > BF3 (4) BF3 > BCl3 > BBr3 > Bl3

Q42.The correct order of basicity of oxides of vanadium is JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper (1) V2O3 > V2O4 > V2O5 (2) V2O3 > V2O5 > V2O4 (3) V2O5 > V2O4 > V2O3 (4) V2O4 > V2O3 > V2O5

Q42.Compound that will give positive Lassaigne's test for both nitrogen and halogen is (1) N2H4 ⋅HCl (2) CH3 NH2. HCl (3) NH4 Cl (4) NH2 OH. HCl

Q42.From the figure of column chromatography given below, identify incorrect statements. JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper A . Compound ‘ c’ is more polar than ‘ a ’ and ‘ b ’ B. Compound ‘ a ’ is least polar C. Compound ‘ b’ comes out of the column before ‘ c’ and after ‘ a ’ D . Compound ‘ a ’ spends more time in the column Choose the correct answer from the options given below (1) A, B and D only (2) A, B and C only (3) B and D only (4) B, C and D only

Q43.Correct statements for the given reaction are: JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper A. Compound ‘ B ’ is aromatic B. The completion of above reaction is very slow C. ‘ A ’ shows tautomerism D. The bond lengths of C −C in compound B are found to be same Choose the correct answer from the options given below. (1) B, C and D only (2) A, B and C only (3) A, C and D only (4) A, B and D only

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.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