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Practice Problems for IITJEE

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Mar. 25, 2023
Practice Problems for IITJEE
Practice Problems for IITJEE
Practice Problems for IITJEE
Practice Problems for IITJEE
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Practice Problems for IITJEE

  1. ONLY ONE OPTION IS CORRECT Q.1 ThemetalXis preparedbytheelectrolysisoffused chloride. It reacts withhydrogentoformacolourless solid fromwhichhydrogenis released ontreatment withwater. The metalis : (A)Al (B) Ca (C) Cu (D)Zn Q.2 Magnesiumhaspolarising power close to that of (A) Li (B) Na (C) K (D) Cs Q.3 Mortar isa mixture of (A) Ca(OH)2 silica and water (B) CaCO3 and SiO2 (C) CaO and silica (D) CaCO3, SiO2 and water Q.4 Na2CO3 + Fe2O3  A+ CO2 what isAin the reaction? (A) NaFeO2 (B) Na3FeO3 (C) Fe3O4 (D) Na2FeO2 Q.5 Ferrous sulphateonheating gives (A) SO2 and SO3 (B) SO2 only (C) SO3 only (D) S only Q.6 In comparisonofferrous salts, ferric salts are (A) more stable (B) less stable (C) equallystable (D) noneofthese Q.7 Sodiumburns inair to give (A) Na2 O (B) Na2 O2 (C) NaO2 (D) Na3 N Q.8 Oxone is (A) CaO (B) N2 O (C) Na2 O2 (D) NaBO3 Q.9 Whichofthefollowing is not anore ofmagnesium? (A)carnallite (B) magnesite (C) dolomite (D) gypsum Q.10 At hightemperature, nitrogencombines with CaC2 to give (A) calciumcyanide (B) calciumcyanamide (C) calciumcarbonate (D)calciumnitride Q.11 When magnesiumburns inair, compoundsofmagnesiumformed aremagnesiumoxide and (A) Mg3 N2 (B) MgCO3 (C) Mg(NO3 )2 (D) Mg(NO2 )2 Q.12 Which ofthe following is different fromother three oxides? (A) MgO (B) SnO (C) ZnO (D) PbO Q.13 When alumina is electrolysed inpresence ofcryolite, the gas liberated at graphite anode is (A) F2 (B) O2 (C) CF4 (D) F2O Q.14 In Nessler's reagent, the ion present is (A) HgI2— (B)HgI4 2— (C) Hg+ (D) Hg2+ Q.15 Chrome yellow is chemicallycalled (A) lead chromate (B) lead sulphate (C) lead iodide (D) basic lead acetate Q.16 Aluminiummetalis purifiedby (A) Hoope's process (B) Hall's process (C) Serpeck's process (D) Baeyer's process Q.17 Whichofthe followingis truefor magnesium? (A) It ismore electropositive that sodium (B) It ismanufactured byelectrolysis ofaqueous magnesiumchloride (C) It is a strong reducing agent. (D) It resembles, in chemical properties, with its diagonallyplaced element Boron in 13 group of the Periodic Table. Q.18 A piece ofmagnesiumribbon was heated to redness in a atmosphere ofnitrogen and then cooled with water. The gas evolved in (A)Ammonia (B) Hydrogen (C) Nitrogen (D) Oxygen
  2. Q.32 High puritycoppermetalis obtained by (A) carbonreduction (B) hydrogenreduction (C) electrolytic reduction (D) thermite reduction Q.33 Silica isadded to roasted copper ores during smelting inorder to remove (A) cuprous sulphide (B) ferrous oxide (C) ferrous sulphide (D) cuprous oxide Q.34 Roasting ofcopperpyrites is done (A) to removemoistureand volatile impurities (B) to oxidise free sulphur (C) to decompose pyrites into Cu2 S and FeS (D) for allthe above Q.35 In the electrolyticrefining ofcopper,Ag andAu are found (A) on cathode (B) on anode (C) inthe anodic mud (D) inthe cathodic mud Q.36 In a transitionseries, as the atomic number increases, paramagnetism (A) Increases gradually (B) Decreases gradually (C) First increases to a maximumand then decreases (D) First decreases to a minimumand then increases Q.37 Sodiumthiosulphate, Na2S2O3.5H2O is used in photographyto : (A) Reducethe silver bromide grains to metallic silver (B) Convert the metallic silver to silver salt (C) remove undecomposedAgBr as soluble silver thiosulphate complex (D) removereduced silver Q.38 WhenAgNO3 comes incontact with skin, it leaves a black stain. This is because of (A) HNO3 produced byhydrolysis ofAgNO3 (B)AgOH produced byhydrolysis ofAgNO3 (C) Its reductionto silver (D) Its oxidationto silver oxide Q.39 The element which is present ineveryamalgamis (A) copper (B)Silver (C) Iron (D) Mercury Q.40 Whichofthe following statements is incorrect? (A) Mercurous ionexists as Hg+ (B) Mercurous ionis diamagnetic and existsas dimer Hg2 2+ (C) Mercurous ion is colourless (D) There is a covalent bond between two Hg+ ions. Q.41 CuSO4 solution+ lime is called (A) Luca's reagent (B) Bafoed's reagent (C) Fehling solutionA (D)Bordeauxmixture Q.42 Silver can be separated from lead by (A)fractionalcrystallisation (B)amalgamation (C) filteration (D) additionofzinc Q.43 Red precipitate is obtained when silver nitrate is added to (A) K2CrO4 (B) KI (C) KBr (D) Na2S2O3 Q.44 Photographic films orplates have ......... as anessentialingredient (A) silver oxide (B) silver bromide (C)silverthiosulphate (D)silver nitrate Q.45 Silver nitrate isusuallysupplied incoloured bottlesbecause it is (A) oxidisedinair (B) decomposesinsunlight (C) explodes insunlight (D) reacts withair insunlight Q.46 Disodiumhydrogenphospahte in presence ofNH4 Cland NH4 OH gives a white ppt. witha solution of Mg2+ ion. The precipitate is : (A)Mg(H2 PO4 )2 (B) Mg3 (PO4 )2 (C) MgNH4 PO4 (D) MgHPO4 Q.47 Verdigrisis (A) Basic copper acetate (B) Basic lead acetate (C) Basic lead (D) None
  3. CHOOSE THE CORRECT OPTION. MORE THAN ONE ARE CORRECT Q.1 WhenH2Sispassedthroughanammonicalsalt solutionofX, ablackprecipitateisformed. TheX canbe: (A) cobalt salt (B) nickelsalt (C) manganese salt (D) zinc salt Q.2 Which ofthe following are soluble inexcess ofNaOH? (A)Al(OH)3 (B) Cr(OH)3 (C) Fe(OH)3 (D) Zn(OH)2 Q.3 Whichareinterfering radicals? (A)  2 4 SO (B)  3 4 PO (C)  3 3 BO (D)  2 4 2O C Q.4 Asolutionofa salt inHClwhen diluted with water turnsmilky. It indicates thepresence of: (A) Zn (B)Bi (C) Fe (D) Sb Q.5 Which statements about mercuryare correct? (A) Hg is a liquid metal (B) Hg forms two series ofsalts (C) Hgforms no amalgamwithironand platinum (D) Hg does not show variable valency Q.6 WhenexcessofSn(II) chloride solutionis added to Hg(II) chloride solution, thesubstances formedare: (A) Sn-amalgam (B) Hg2Cl2 (C) SnCl4 (D)Hg Q.7 Identifythecorrect statements: (A) Fluorine is a super halogen (B) Iodineshows basic nature (C)AgF isinsoluble inwater (D) SCN– is the pseudohalide Q.8 Which reactions areused for the preparation ofthe halogen acid? (A) 2KBr + H2SO4  K2SO4 + 2HBr (B) CaF2 + H2SO4  CaSO4 + 2HF (conc.) (conc.) (C) NaCl + H2SO4  NaHSO4 + HCl (D) NaHSO4 + NaCl  Na2SO4 + HCl (conc.) Q.9 Available chlorineis liberated frombleachingpowder when it: (A) is heated (B) reacts with acid (C) reactswithwater (D) reacts with CO2 Q.10 Whichofthe following gases ondissolutioninwater make the solutionacidic? (A) CO (B) CO2 (C) SO3 (D) PH3 Q.11 Reducing propertyofsulphur dioxide is shownin the reactions: (A) 2H2S + SO2  3S + 2H2O (B) 5SO2 + 2KMnO4+ 2H2O  K2SO4 + 2MnSO4 + 2H2SO4 (C) SO2 + 2HNO3  H2SO4 + 2NO2 (D) 4Na + 3SO2  Na2SO3 + Na2S2O3 Q.12 Which statements are correct for ozone? (A) It is obtained bysilent electric discharge on oxygen (B) It can be obtained bythe actionofultraviolet rays on oxygen (C) It is regarded as anallotrope ofoxygen (D)Ozonemoleculeisparamagneticlikeoxygenmolecule Q.13 Phosphine is obtainedbythe reaction when: (A) white phosphorus is heated with NaOH (B) Ca3P2 reacts with water (C) red phosphorus is heated with NaOH (D) phosphorusis heated in acurrent ofhydrogen. Q.14 At hightemperatures, nitrogendirectlycombineswith: (A) Zn (B) Mg (C)Al (D) Fe Q.15 The compounds obtained byheating oforthophosphoric acid are: (A) metaphosphoric acid (B) pyrophosphoric acid (C) P4O6 (D) P4O10 Q.16 Whichare used as refrigerant? (A) NH3 (B) CO2 (C) CCl2F2 (D) CO Q.17 Identifythecorrect statements regarding structureofdiborane: (A) there are two bridging hydrogenatoms (B) each boronatomforms four bonds (C) thehydrogenatomsarenot inthesameplane (D) each boron atomis in sp3 hybridized state
  4. MATCH THE COLUMN Q.1 ColumnI ColumnII (A) Dithionousacid (P) S–O–S bond is not present (B)Thiosulphuric acid (Q)AllS atomin the molecule has oxidation state +3 (C) Caro's acid (R)Acidic strengthofallH atoms present inthe molecule is different (D) Pyrosulphurous acid (S) at least one S atomhas oxidation state +5 in molecule Q.2 ColumnI ColumnII (A) XeF5 + (P) Two lone pairs (B) ICl4 – (Q) Planar (C) TeCl4 (R) Non-planar (D) I3 + (S) sp3d2 (Hybridizationofcentralatom) Q.3 Select the optionwhichcorrectlyrepresents theorder ofBoiling pointsofgivencompounds. ColumnI ColumnII (A) H2O NH3 HF (P) a > b > c [a] [b] [c] (B) SbH3 PH3 AsH3 (Q) c > b > a [a] [b] [c] (C) C2H6 C3H8 C4H10 (R) b > a > c [a] [b] [c] (D) CH3OH OH OH | | CH CH 2 2  CH3Cl (S) a > c > b [a] [b] [c] ANSWER KEY ONLY ONE OPTION IS CORRECT Q.1 B Q.2 A Q.3 A Q.4 A Q.5 A Q.6 A Q.7 B Q.8 C Q.9 D Q.10 B Q.11 A Q.12 A Q.13 B Q.14 B Q.15 A Q.16 A Q.17 C Q.18 A Q.19 C Q.20 D Q.21 A Q.22 A Q.23 D Q.24 B Q.25 A Q.26 B Q.27 A Q.28 C Q.29 D Q.30 C Q.31 C Q.32 C Q.33 B Q.34 D Q.35 C Q.36 C Q.37 C Q.38 C Q.39 D Q.40 A Q.41 D Q.42 D Q.43 A Q.44 B Q.45 B Q.46 C Q.47 A Q.48 D Q.49 C Q.50 D Q.51 A Q.52 B Q.53 A Q.54 D Q.55 A Q.56 C Q.57 C Q.58 B Q.59 C Q.60 D Q.61 D Q.62 A Q.63 C Q.64 B Q.65 B CHOOSE THE CORRECT OPTION. MORE THAN ONE ARE CORRECT Q.1 A,B Q.2 A,B,D Q.3 B,C,D Q.4 A,B,D Q.5 A,B,C,D Q.6 B,C,D Q.7 A,B,D Q.8 B,C,D Q.9 B,C,D Q.10 B,C Q.11 B,C Q.12 A,B,C Q.13 A,B Q.14 B,C Q.15 A,B,D Q.16 A,B,C Q.17 A,B,C,D Q.18 B,C,D Q.19 C,D Q.20 B,D Q.21 B,C,D Q.22 B,D Q.23 A,C,D Q.24 A,B,C,D Q.25 B,D Q.26 A,B,D Q.27 A,B Q.28 A,B,C Q.29 A,B,C,D Q.30 C,D Q.31 A,C Q.32 C,D MATCH THE COLUMN Q.1 (A) P,Q; (B)P; (C) P,R; (D) P,R,S Q.2 (A) R, S; (B) P, Q, S; (C) R; (D) P, Q Q.3 (A) S, (B) S, (C) Q, (D) R
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