Practice Questions

Q40.Match List - I with List - II : List-I List-II (A) Sphalerite (I) FeCO3 (B) Calamine (II) PbS (C) Galena (III) ZnCO3 (D) Siderite (IV) ZnS Choose the most appropriate answer from the options given below : (1) (A) −(IV), (B) −(I), (C) −(II), (D) −(III) (2) (A) −(IV), (B) −(III), (C) −(II), (D) −(I) (3) (A) −(II), (B) −(II), (C) −(I), (D) −(IV) (4) (A) −(III), (B) −(IV), (C) −(II), (D) −(I)

Q41.The depression in freezing point observed for a formic acid solution of concentration 0 . 5 mL L-1 is 0 . 0405 °C. Density of formic acid is 1 . 05 g mL-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water kf = 1 . 86 K kg mol-1) (1) 0 . 8 (2) 1 . 1 (3) 1 . 9 (4) 2 . 4

Q41.The role of depressants in 'Froth Floation method' is to JEE Main 2022 (26 Jun Shift 2) JEE Main Previous Year Paper (1) selectively prevent one component of the ore (2) reduce the consumption of oil for froth from coming to the froth. formation. (3) stabilize the froth. (4) enhance non-wettability of the mineral particles.

Q41.Dihydrogen reacts with CuO to give (1) Cu (OH)2 (2) Cu(s) (3) Cu2 O (4) CuH2

Q41.In following pairs, the one in which both transition metal ions are colourless is (1) Sc3+, Zn2+ (2) Ti4+, Cu2+ (3) V2+, Ti3+ (4) Zn2+, Mn2+

Q41.The major product formed in the given reaction is: JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.The most stable trihalide of nitrogen is. (1) NF3 (2) NCl3 (3) NBr3 (4) NI3

Q42.Which of the following methods are not used to refine any metal? (A) Liquation (B) Calcination (C) Electrolysis (D) Leaching (E) Distillation Choose the correct answer from the options given below (1) B and D only (2) A, B, D and E only (3) B, D and E only (4) A, C and E only

Q42.Match List I with List II. List I With Ore List II Composition A.Siderite I. FeCO3 B.Malachite II. CuCO3 ⋅Cu(OH)2 C.Sphalerite III. ZnS D.Calamine IV. ZnCO3 Choose the correct answer from the options given below: (1) A-I, B-II, C-III, D-IV (2) A-III, B-IV, C-E, D-I (3) A-IV, B-III, C-I, D-II (4) A-I, B-II, C-IV, D-III

Q42.The compound(s) that is(are) removed as slag during the extraction of copper is : (1) CaO (2) FeO (3) Al2O3 (4) ZnO (5) NiO Choose the correct answer from the options given below (1) 3, 4 only (2) 2 only (3) 1, 2, 5 Only (4) 1, 2 only

Q42.The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state? (1) Ce(At. No, 58) (2) La(At. No, 57) (3) Lu(At. No, 71) (4) Gd(At. No, 64)

Q43.Refining using liquation method is the most suitable for metals with (1) Low melting point (2) High boiling point (3) High electrical conductivity (4) Less tendency to be soluble in melts than impurities

Q43.Which of the following chemical reactions represents Hall-Heroult Process? (1) Cr2 O3 + 2Al →Al2 O3 + 2 Cr (2) 2 Al2 O3 + 3C →4Al + 3 CO2 (3) FeO + CO →Fe + CO2 (4) 2[Au (CN)2]−(aq) + Zn(s) →2 Au(s) + [Zn(CN4)]2−

Q43.Polar stratospheric clouds facilitate the formation of (1) ClONO2 (2) HOCl (3) ClO (4) CH4

Q43.Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula? (1) Pyrophosphorous acid (2) Hypophosphoric acid (3) Phosphoric acid (4) Pyrophosphoric acid

Q43.Which of the reaction is suitable for concentrating ore by leaching process? (1) 2Cu2 S + 3O2 →2Cu2O + 2SO2 (2) Fe3O4 + CO →3FeO + CO2 (3) Al2O3 + 2NaOH + 3H2O →2NaAlOH4 (4) Al2O3 + 6Mg →6MgO + 4Al

Q43.The metal that is not extracted from its sulphide ore is (1) Aluminium (2) Iron (3) Lead (4) Zinc

Q43.The interhalogen compound formed from the reaction of bromine with excess of fluorine is a (1) hypohalite (2) halate (3) perhalate (4) halite

Q44. PCl5 is well known but NCl5 is not.Because, (1) N - does not have vacant d-orbital (2) P - does not have 2d orbitals (3) Back bonding in NCl5 is not possible (4) N atom is more electronegative so does not forms 5 bonds

Q44.White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of (1) AgNH34Cl2 (2) AgCl2NH32 (3) AgNH32Cl (4) AgNH3ClCl

Q44.The dark purple colour of KMnO4 disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is (1) 5 (2) 1 (3) 7 (4) 2

Q44.The structure of A in the given reaction is ​ JEE Main 2022 (27 Jul Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q45.The total number of Mn = O bonds in Mn2 O7 is (1) 4 (2) 5 (3) 6 (4) 3

Q46.Which of the following has least tendency to liberate H2 from mineral acids? (1) Cu (2) Mn (3) Ni (4) Zn

Q46.Match List-I with List-II. List-I List-II A I Gatterman Koch reaction B II Etard reaction C III Stephen reaction JEE Main 2022 (27 Jul Shift 2) JEE Main Previous Year Paper D IV Rosenmund reaction Choose the correct answer from the options given below (1) A −IV, B −III, C −II, D −I (2) A −I, B −II, C −III, D −IV (3) A −II, B −III, C −IV, D −I (4) A −III, B −II, C −I, D −IV