Practice Questions

Q33.The oxidation states of nitrogen in NO, NO2, N2O and NO−3 are in the order of : (1) NO−3 > NO2 > NO > N2O (2) NO2 > NO−3 > NO > N2O (3) N2O > NO2 > NO > NO−3 (4) NO > NO2 > N2O > NO−3

Q34.The oxidation states of ′P′ in H4P2O7, H4P2O5 and H4P2O6, respectively, are : (1) 7, 5 and 6 (2) 5, 4 and 3 (3) 5, 3 and 4 (4) 6, 4 and 5

Q34.The solubility of AgCN in a buffer solution of pH = 3 is x . The value of x is: [Assume : No cyano complex is formed ; Ksp(AgCN) = 2. 2 × 10−16 and Ka(HCN) = 6. 2 × 10−10 ] (1) 1. 9 × 10−5 (2) 2. 2 × 10−16 (3) 0. 625 × 10−6 (4) 1. 6 × 10−6

Q34.The set of elements that differ in mutual relationship from those of the other sets is: (1) Li −Mg (2) B −Si (3) Be −Al (4) Li −Na

Q34.Match List −I with List −II List −I List −II (a) Ca(OCl)2 (i) Antacid (b) CaSO4 ⋅12 H2O (ii) Cement (c) CaO (iii) Bleach (d) CaCO3 (iv) Plaster of paris Choose the most appropriate answer from the (1) a −i, b −iv, c −iii, d −ii (2) a −iii, b −ii, c −iv, d −i (3) a −iii, b −iv, c −ii, d −i (4) a −iii, b −ii, c −i, d −iv

Q34.The major component/ingredient of Portland Cement is : (1) dicalcium silicate (2) tricalcium aluminate (3) dicalcium aluminate (4) tricalcium silicate

Q34.The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are: (1) 2, 0 and 0. 5 (2) 0. 5, 0 and 2 (3) 2, 0 and 1 (4) 5, 0 and 0. 5

Q34.What are the products formed in sequence when excess of CO2 is passed in slaked lime? (1) CaO, CaCO3 (2) Ca (HCO3)2′ CaCO3 (3) CaCO3, Ca (HCO3)2 (4) CaO, Ca (HCO3)2

Q35.Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point) ? (1) Simple distillation (2) Steam distillation (3) Fractional distillation (4) Reduced pressure distillation

Q35.Identify the process in which change in the oxidation state is five : (1) Cr2 O2−7 →2 Cr3+ (2) MnO−4 →Mn2+ (3) CrO2−4 →Cr3+ (4) C2O2−4 →2 CO2

Q35.One of the by-products formed during the recovery of NH3 from Solvay process is: (1) Ca(OH)2 (2) NaHCO3 (3) CaCl2 (4) NH4 Cl

Q36.In stratosphere most of the ozone formation is assisted by : (1) γ -rays (2) cosmic rays (3) visible radiations (4) ultraviolet radiation

Q36.Which one of the following metals forms interstitial hydride easily ? (1) Cr (2) Fe (3) Mn (4) Co JEE Main 2021 (25 Jul Shift 2) JEE Main Previous Year Paper

Q36.Staggered and eclipsed conformers of ethane are: (1) Polymers (2) Rotamers (3) Enantiomers (4) Mirror images JEE Main 2021 (27 Jul Shift 1) JEE Main Previous Year Paper

Q36.The single largest industrial application of dihydrogen is: (1) Manufacture of metal hydrides (2) Rocket fuel in space research (3) In the synthesis of ammonia (4) In the synthesis of nitric acid JEE Main 2021 (20 Jul Shift 2) JEE Main Previous Year Paper

Q37. BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively as: (1) A < 5, B > 17 (2) A > 50, B < 27 (3) A > 15, B > 47 (4) A > 25, B < 17

Q37.Water sample is called cleanest on the basis of which one of the BOD values given below : (1) 11 ppm (2) 15 ppm (3) 3 ppm (4) 21 ppm

Q37.Which one of the following chemical agent is not being used for dry-cleaning of clothes? (1) H2O2 (2) CCl4 (3) Liquid CO2 (4) Cl2C = CCl2

Q37.Mesityl oxide is a common name of: (1) 2, 4 -Dimethylpentan- 3 -one (2) 3-Methylcyclohexanecarbaldehyde (3) 2-Methylcyclohexanone (4) 4-Methylpent- 3-en- 2-one

Q37.In CH21 = C2 = CH3 − CH34 molecule, the hybridization of carbon 1, 2, 3 and 4 respectively, are : (1) sp2, sp3, sp2, sp3 (2) sp2, sp, sp2, sp3 (3) sp2, sp2, sp2, sp3 (4) sp3, sp, sp3, sp3

Q37.In chromatography technique, the purification of a compound is independent of: (1) Mobility or flow of solvent system (2) Solubility of the compound (3) Length of the column or TLC Plate (4) Physical state of the pure compound

Q37.In the following molecules, Hybridisation of carbon a, b and c respectively are : JEE Main 2021 (18 Mar Shift 2) JEE Main Previous Year Paper (1) sp3, sp, sp (2) sp3, sp2, sp (3) sp3, sp2, sp2 (4) sp3, sp, sp2

Q38.Tyndall effect is more effectively shown by: (1) lyophilic colloid (2) suspension (3) lyophobic colloid (4) true solution

Q38.The gas released during anaerobic degradation of vegetation may lead to: (1) Corrosion of metals (2) Ozone hole (3) Global warming and cancer (4) Acid rain

Q38.Green chemistry in day-to-day life is in the use of: (1) Chlorine for bleaching of paper (2) Large amount of water alone for washing clothes (3) Tetrachloroethene for laundry (4) Liquified CO2 for dry cleaning of clothes