ranjeet shahi chem

8/13/2019 ranjeet shahi chem

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R a n j e e t S h a h i C h e m i s t r y C l a s s e sR a n j e e t S h a h i C h e m i s t r y C l a s s e sR a n j e e t S h a h i C h e m i s t r y C l a s s e sR a n j e e t S h a h i C h e m i s t r y C l a s s e s S C O 4 8 , I I

n d F l o o r , S e c t o r 2 0 C , C H A N D I G A R H P h : 2 7 2 5 7 4 8 , 3 0 4 0 6 6 0

S C F 7 2 , S e c t o r 1 0 , P a n c h k u l a , P h : 3 9 1 4 8 4 4

1

Copyright Ranjeet Shahi

IITIITIITIIT----JEEJEEJEEJEEReview Questions

Qualitative Inorganic Analysis

Level-1 (Single Correct Answer)

Q1. A white crystalline substance dissolves in water. On passing H2S gas in this solution, a black ppt is obtained. The black pptdissolves completely in hot HNO3. On adding a few drops of conc. H2SO4, a white ppt is obtained. This ppt is that of(A) BaSO4 (B) SrSO4 (C) PbSO4 (D) CdSO4

C

Q2. When excess of SnCl2is added to a solution of HgCl2, a white ppt turning grey is obtained. The grey colour is due to theformation of(A) Hg2Cl2 (B) SnCl4 (C) Sn (D) Hg

D

Q3. Of the following sulphides which one is insoluble in dil. acids but soluble in alkalies.(A) PbS (B) CdS (C) FeS (D) As2S3

D

Q4. When chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour isobtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test

confirms the presence of the following in aqueous solution(A) Iodide (B) Bromide (C) Chloride (D) Iodide and bromide

A

Q5. An aqueous solution of colourless metal sulphate M, gives a white ppt, with NH4OH. This was soluble in excess ofNH4OH. On passing H2S through this solution a white ppt is formed. The metal M in the salt is

(A) Ca (B) Ba (C) Al (D) Zn

D

Q6. When AgNO3is strongly heated, the products formed are(A) NO and NO2 (B) NO2and O2 (C) NO2and N2O (D) NO and O2

B

Q7. AgCl is soluble in(A) Aqua regia (B) H2SO4 (C) dil. HCl (D) aq. NH3

D

Q8. A substance on treatment with dil. H2SO4liberates a colourless gas which produces (i) turbidity with baryta water and (ii)turns acidified dichromate solution green. The reaction indicates the presence of

(A) CO32

(B) S2

(C) SO32

(D) NO2

C

Q9. When copper nitrate is strongly heated, it is converted into(A) Cu metal (B) cupric oxide (C) cuprous oxide (D) copper nitrate

B

Q10. A white solid is first heated with dil H2SO4and then with conc. H2SO4. No action was observed in either case. The solidsalt contains

(A) sulphide (B) sulphite (C) thiosulphate (D) sulphate

D

Q11. A pale green crystalline metal salt of M dissolves freely in water. On standing it gives a brown ppt on addition of aqueousNaOH. The metal salt solution also gives a black ppt on bubbling H 2S in basic medium. An aqueous solution of the metal

salt decolourizes the pink colour of the permanganate solution. The metal in the metal salt solution is

(A) copper (B) aluminium (C) lead (D) iron

D

Q12. On the addition of a solution containing CrO4 ions to the solution of Ba +, Sr +and Ca +ions, the ppt obtained first willbe of

(A) CaCrO4 (B) SrCrO4 (C) BaCrO4 (D) a mixture of all the three

C

Qualitative

Analysis1


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Q13. Turnbull's blue is a compound(A) ferricyanide (B) ferro ferricyanide (C) ferrous cyanide (D) ferriferrocyanide

B

Q14. Sodium borate on reaction with conc. H2SO4and C2H5OH gives a compound A which burns with a green edged flame.The compound A is

(A) H2B4O7 (B) (C2H5)2B4O7 (C) H3BO3 (D) (C2H5)3BO3

D

Q15. When K2Cr2O7crystals are heated with conc. HCl, the gas evolved is(A) O2 (B) Cl2 (C) CrO2Cl2 (D) HCl

B

Q16. Which is most soluble in water?(A) AgCl (B) AgBr (C) AgI (D) AgF

D

Q17. An aqueous solution of FeSO4, Al2(SO4)3 and chrome alum is heated with excess of Na2O2 and filtered. The materialsobtained are:(A) a colourless filtrate and a green residue. (B) a yellow filtrate and a green residue.

(C) a yellow filtrate and a brown residue. (D) a green filtrate and a brown residue.

C

Q18. Which compound does not dissolve in hot dilute HNO3?(A) HgS (B) PbS (C) CuS (D) CdS

A

Q19. A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame whentested. The solution gives a yellow precipitate with potassium chromate. The salt is:

(A) NiSO4 (B) BaS2O3 (C) PbS2O3 (D) CuSO4

B

Q20. A white ppt obtained in a analysis of a mixture becomes black on treatment with NH4OH. It may be(A) PbCl2 (B) AgCl (C) HgCl2 (D) Hg2Cl2

D

Q21. Solution of chemical compound X reacts with AgNO3 solution to form a white ppt. Y which dissolves in NH4OH to give acomplex Z. When Z is treated with dil. HNO3, Y reappears. The chemical compound X can be

(A) NaCl (B) CH3Cl (C) NaBr (D) NaI

A

Q22. Read of the following statements and choose the correct code w.r.t true(T) and false(F).(I) manganese salts give a violet borax bead test in reducing flame

(II) from a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl

(III) ferric ions give a deep green precipitate, on adding potassium ferrocyanide solution

(IV) on boiling the solution having K+, Ca2+and HCO3we get a precipitate of K2Ca(CO3)2

(A) TTFF (B) FTFT (C) FTFF (D) TTFT

C

Q23. A metal is brunt in air and the ash on moistening smells of ammonia. The metal is(A) Na (B) Fe (C) Mg (D) Al

C

Q24. Identify the correct order of solubility of Na2S, CuS and ZnS in aqueous medium is:(A) CuS > ZnS > Na2S (B) ZnS > Na2S > CuS

(C) Na2S > CuS > ZnS (D) Na2S > ZnS > CuS

D

Q25. A mixture of chlorides of copper, cadmium, chromium, iron and aluminium was dissolved in water acidified with HCl andhydrogen sulphide gas was passed for sufficient time. It was filtered, boiled and a few drops of nitric acid were added

while boiling. To this solution ammonium chloride and sodium hydroxide were added in excess and filtered. The filtrateshall give test for

(A) sodium and iron (B) sodium, chromium and aluminium

(C) aluminium and iron (D) sodium, iron, cadmium and aluminium

B

Q26. When H2S gas is passed through the HCl containing aqueous solution of CuCl 2, HgCl2, BiCl3 and CoCl2, it does notprecipitate out:(A) CuS (B) HgS (C) Bi2S3 (D) CoS

D


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Q27. Dimethyl glyoxime in a suitable solvent was refluxed for 10 minutes with pure pieces of nickel sheet, it will result in(A) Red ppt (B) Blue ppt. (C) Yellow ppt. (D) No ppt.

D

Q28. On passing H2S gas in II group sometimes the solution turns milky. It indicates the presence of(A) oxidising agent (B) acidic salt (C) thiosulphate (D) reducing agent.

A

Q29. A gas X is passed through water to form a saturated solution. The aqueous solution on treatment with AgNO3gives awhite precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas Y.

Identify X and Y:(A) X = CO2, Y = Cl2 (B) X = Cl2, Y = CO2 (C) X = Cl2, Y = H2 (D) X = H2, Y= Cl2

C

Q30. The compound formed in the borax bead test of Cu2+ion in oxidising flame is:(A) Cu (B) CuBO2 (C) Cu(BO2)2 (D) None of these

C

Q31. Which one of the following metal sulphides has maximum solubility in water?(A) HgS, Ksp =1054 (B) CdS, Ksp= 10

30 (C) FeS, Ksp=1020 (D) ZnS, Ksp = 1022

C

Q32. Which of the following is not a preliminary test used to detect ions:(A) borax bead test (B) flame test (C) brown ring test (D) cobalt nitrate test

C

Q33. The metal ion which is precipitated when H2S is passed with HCl:(A) Zn2+ (B) Ni2+ (C) Cd2+ (D) Mn2+

C

Q34. Mercurous ion is represented as:(A) Hg2

2+ (B) Hg2+ (C) Hg+Hg2+ (D) Hg2+

A

Q35. In the borax bead test of Co2+, the blue colour of bead is due to the formation of:(A) B2O3 (B) Co3B2 (C) Co(BO2)2 (D) CoO

C

Q36. Which of the following is insoluble in excess of NaOH?(A) Al(OH)3 (B) Cr(OH)3 (C) Fe(OH)3 (D) Zn(OH)2

C

Q37. Which of the following gives blood red colour with KCNS?(A) Cu2+ (B) Fe3+ (C) Al3+ (D) Zn2+

B

Q38. A metal X on heating in nitrogen gas gives Y.Y on treatment with H2O gives a colourless gas which when passed throughCuSO4solution gives a blue colour Y is:

(A) Mg(NO3)2 (B) Mg3N2 (C) NH3 (D) MgO

B

Q39. Nitrate is confirmed by ring test. The brown colour of the ring is due to formation of(A) ferrous nitrite (B) nitroso ferrous sulphate

(C) ferrous nitrate (D) FeSO4NO2

B

Q40. Which one of the following can be used in place of NH4Cl for the identification of the third group radicals?(A) NH4NO3 (B) (NH4)2SO4 (C) (NH4)2S (D) (NH4)2CO3

C

Q41. Fe(OH)3can be separated from Al(OH)3by addition of(A) dil. HCl (B) NaCl solution(C) NaOH solution (D) NH4Cl and NH4OH

C

Q42. A mixture, on heating with conc. H2SO4 and MnO2, librates brown vapour of(A) Br2 (B) NO2 (C) HBr (D) I2

A


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Q43. If NaOH is added to an aqueous solution of zinc ions a white ppt appears and on adding excess NaOH, the ppt dissolves.In this solution zinc exist in the

(A) cationic part (B) anionic part(C) both in cationic and anionic parts (D) there is no zinc ion in the solution

B

Q44. Ferric ion forms a prussian blue coloured ppt. of(A) K4[Fe(CN)6] (B) Fe4[Fe(CN)6]3 (C) KMnO4 (D) Fe(OH)3

B

Q45. Mark the compound which is soluble in hot water.(A) Lead chloride (B) Mercurous chloride (C) Stronsium sulphate (D) Silver chloride

A

Q46. When bismuth chloride is poured into a large volume of water the white precipitate produced is(A) Bi(OH)3 (B) Bi2O3 (C) BiOCl (D) Bi2OCl3

C

Q47. Sometimes yellow turbidity appears while passing H2S gas even in the absence of II group radicals. This is because of(A) sulphur is present in the mixture as impurity. (B) IV group radicals are precipitated as sulphides.

(C) the oxidation of H2S gas by some acid radicals. (D) III group radicals are precipitated as hydroxides.

C

Q48. Nessler's reagent is(A) K2HgI4 (B) K2HgI4+ KOH (C) K2HgI2+ KOH (D) K2HgI4+ KI

B

Q49. The ion that cannot be precipitated by H2S and HCl is(A) Pb

2+ (B) Cu

2+ (C) Ag

+ (D) Ni

2+

D

Q50. Which of the following pairs of ions would be expected to form precipitate when dilute solution are mixed?(A) Na

+, SO4

2 (B) NH4

+, CO3

2 (C) Na

+,S2

2 (D) Fe

3+, PO4

3

D

Q51. In V group, (NH4)2CO3is added to precipitate out the carbonates. We do not add Na2CO3along with NH4Cl because(A) CaCO3is soluble in Na2CO3. (B) Na2CO3increases the solubility of V group carbonate.

(C) MgCO3will be precipitated out in V group. (D) None of these

D

Q52. When a mixture of solid NaCl, solid K2Cr2O7is heated with conc. H2SO4, orange red vapours are obtained. These are ofthe compound

(A) chromous chloride (B) chromyl chloride (C) chromic chloride (D) chromic sulphate

B

Q53. CuSO4decolourises on addition of excess KCN, the product is(A) [Cu(CN)4]

2 (B) Cu

2+get reduced to form [Cu(CN)4]

3

(C) Cu(CN)2 (D) CuCN

B

Q54. The acidic solution of a salt produced a deep blue colour with starch iodide solution. The salt may be(A) chloride (B) nitrite (C) acetate (D) bromide

B

Q55. Which of the following cations is detected by the flame test?(A) NH4

+ (B) K+ (C) Mg2+ (D) Al3+

B

Q56. A salt gives violet vapours when treated with conc. H2SO4, it contains(A) Cl (B) I (C) Br (D) NO3

B

Q57. Which one among the following pairs of ions cannot be separated by H2S in dilute HCl?(A) Bi

3+, Sn

4+ (B) Al

3+, Hg

2+ (C) Zn

2+, Cu

2+ (D) Ni

2+, Cu

2+

A


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Q58. In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammoniumhydroxide to

(A) decrease concentration of OHions. (B) prevent interference by phosphate ions.

(C) increase concentration of Clions. (D) increase concentration of NH4+ions.

A

Q59.MgSO4on reaction with NH4OH and Na2HPO4forms a white crystalline precipitate. What is its formula?(A) Mg(NH4)PO4 (B) Mg3(PO4)2 (C) MgCl2MgSO4 (D) MgSO4 A

Q60. Potassium chromate solution is added to an aqueous solution of a metal chloride. The precipitate thus obtained areinsoluble in acetic acid. These are subjected to flame test, the colour of the flame is:

(A) Lilac (B) Apple green (C) Crimson red (D) Golden yellow

B

Q61. Mark the correct statement:(A) I group basic radicals precipitate as chlorides (B) IV group basic radicals precipitates as sulphides.

(C) V group basic radicals precipitates as carbonates. (D) All the above statement are correct.

D

Q62. A metal salt solution gives a yellow ppt with silver nitrate. The ppt dissolves in dil. nitric acid as well as in ammoniumhydroxide. The solution contains

(A) bromide (B) iodide (C) phosphate (D) chromate

C

Q63. A metal salt solution forms a yellow ppt with potassium chromate in acetic acid, a white ppt with dilute sulphuric acid, butgives no ppt with sodium chloride or iodide, it is :

(A) lead carbonate (B) basic lead carbonate (C) barium nitrate (D) strontium nitrate

C

Q64. Which is soluble in NH4OH?(A) PbCl2 (B) AgCl (C) PbSO4 (D) CaCO3

B

Q65. Which of the following combines with Fe(II) ions to form a brown complex(A) N2O (B) NO (C) N2O3 (D) N2O4

B

Q66. Nessler's reagent is used to detect(A) CrO4

2

(B) PO43

(C) MnO4

(D) NH4+

D

Q67. Prussian blue is formed when(A) ferrous sulphate reacts with FeCl3. (B) ferric sulphate reacts with K4[Fe(CN)6]

(C) Ammonium sulphate reacts with FeCl3 (D) ferrous ammonium sulphate reacts with FeCl3

B

Q68. What product is formed by mixing the solution of K4[Fe(CN)6] with the solution of FeCl3?(A) Ferro-ferricyanide (B) Ferri-ferrocyanide

(C) Ferri-ferricyanide (D) None of these

B

Q69. Which of the following will not give positive chromyl chloride test?(A) Copper chloride, CuCl2 (B) Mercuric chloride, HgCl2(C) Zinc chloride, ZnCl2 (D) Anillinium chloride, C6H5NH3Cl

B

Q70. A blue colouration is not obtained when(A) ammonium hydroxide dissolves in copper sulphate. (B) copper sulphate solution reacts with K4[Fe(CN)6].

(C) ferric chloride reacts with sodium ferrocyanide. (D) anhydrous white CuSO4is dissolved in water.

B

Q71. AgCl dissolves in ammonia solution giving(A) Ag+, NH4

+and Cl (B) Ag(NH3)+and Cl

(C) Ag2(NH3)2and Cl

(D) Ag(NH3)2

+and Cl

D

Q72. A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution isadded to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be:(A) CO3

2 (B) Cl (C) SO42 (D) S2

B


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Q73. A mixture of two salts is not water soluble but dissolves completely in dil HCl to form a colourless solution. The mixturecould be:

(A) AgNO3and KBr (B) BaCO3and ZnS (C) FeCl3and CaCO3 (D) Mn(NO3)2and MgSO4

B

Q74. Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ofammonia solution, one formed a white precipitate with dil NaCl solution and one formed a black precipitate with H2S. The

salt could be:(A) AgNO3 (B) Pb(NO3)2 (C) Hg(NO3)2 (D) MnSO4

B

Q75. Which one of the following ionic species will impart colour to an aqueous solution?(A) Ti4+ (B) Cu+ (C) Zn2+ (D) Cr3+

D

Q76. When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. Whenanother substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B

on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour a smokeless flame toBunsen burner. A, B, C and D respectively are:

(A) Na, H2, NaOH, Zn (B) K, H2, KOH, Al

(C) Ca, H2, Ca(OH)2, Sn (D) CaC2, C2H2, Ca(OH)2, Fe

A

Q77. Which is not dissolved by dil HCl?(A) ZnS (B) MnS (C) BaSO3 (D) BaSO4

D

Q78. The brown ring test for NO2and NO3is due to the formation of complex ion with formula:(A) [Fe(H2O)6]

2+ (B) [Fe(NO)(CN)5]

2(C) [Fe(H2O)5(NO)]

2+ (D) [Fe(H2O)(NO)5]

2+

C

Q79. In Nesslers reagents, the ion present is:(A) HgI2

(B) HgI4

2 (C) Hg

+ (D) Hg

2+

B

Q80. The cations present in slightly acidic solution are Fe3+, Zn2+and Cu2+. The reagent which when added in excess to thissolution would identify and separte Fe

3+in one step is:

(A) 2 M HCl (B) 6 M NH3 (C) 6 M NaOH (D) H2S gas

B

Q81. Which of the following leaves no residue on heating?(A) Pb(NO3)2 (B) NH4NO3 (C) Cu(NO3)2 (D) NaNO3

B

Q82. An element (X) forms compounds of the formula XCl3, X2O5and Ca3X2, but does not form XCl5. Which of the followingis the element X?

(A) B (B) Al (C) N (D) P

C

Q83. A white salt is readily soluble in water and gives a colourless solution with a pH of about 9. The salt could be:(A) NH4NO3 (B) CH3COONa (C) CH3COONH4 (D) CaCO3

B

Q84. A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour isnoticed, the cation would be:

(A) Mg2+

(B) Ba2+

(C) Pb2+

(D) Ca2+

A

Q85. Which of the following is soluble in yellow ammonium sulphide?(A) CuS (B) CdS (C) SnS (D) PbS

C

Q86. Which of the following gives a precipitate with Pb(NO3)2but not with Ba(NO3)2?(A) Sodium chloride (B) Sodium acetate

(C) Sodium nitrate (D) Sodium hydrogen phosphate

A

Q87. Which of the following does not react with AgCl?(A) Na2CO3 (B) NaNO3 (C) NH4OH (D) Na2S2O3

B


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Q88. An aqueous solution of a substance gives a white ppt. on treatment with dil. HCl, which dissolves on heating. Whenhydrogen sulphide is passed through the hot acidic solution, a black ppt. is obtained. The substance is a

(A) Hg2+

salt (B) Cu2+

salt (C) Ag+salt (D) Pb

2+salt

D

Q89. A solution when diluted with H2O and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH thevolume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in

NH4OH/NH4Cl(A) Zn(OH)2 (B) Al(OH)3 (C) Mg(OH)2 (D) Ca(OH)2

A

Q90. CrO3dissolves in aqueous NaOH to give:(A) Cr2O7

2 (B) CrO42 (C) Cr(OH)3 (D) Cr(OH)2

B

Q91. Which of the following compound on reaction with NaOH and Na2O2gives yellow colour?(A) Cr(OH)3 (B) Zn(OH)2 (C) Al(OH)3 (D) None of these

A

Q92. When I2is passed through KCl, KF, KBr:(A) Cl2and Br2are evolved (B) Cl2is evolved

(C) Cl2, F2and Br2are evolved (D) None of these

D

Q93. In the separation of Cu2+ and Cd2+ in 2nd group qualitative analysis of cations tetrammine copper (II) sulphate andtetrammine cadmium (II) sulphate react with KCN to form the corresponding cyano complexes. Which one of the

following pairs of the complexes and their relative stability enables the separation of Cu2+and Cd2+?

(A) K3[Cu(CN)4] more stable and K2[Cd(CN)4] less stable.

(B) K2[Cu(CN)4] less stable and K2[Cd(CN)4] more stable.

(C) K2[Cu(CN)4] more stable and K2[Cd(CN)4] less stable.

(D) K3[Cu(CN)4] less stable and K2[Cd(CN)4] more stable.

A

Q94. Which one has the minimum solubility product?(A) AgCl (B) AlCl3 (C) BaCl2 (D) NH4Cl

A

Q95. Which of the following sulphate is insoluble in water?(A) CuSO4 (B) CdSO4 (C) PbSO4 (D) Bi2(SO4)3

C


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Answers1. C 26. D 51. D 76. A2. D 27. D 52. B 77. D3. D 28. A 53. B 78. C4. A 29. C 54. B 79. B5. D 30. C 55. B 80. B6. B 31. C 56. B 81. B7. D 32. C 57. A 82. C8. C 33. C 58. A 83. B9. B 34. A 59. A 84. A10. D 35. C 60. B 85. C11. D 36. C 61. D 86. A12. C 37. B 62. C 87. B13. B 38. B 63. C 88. D14. D 39. B 64. B 89. A15. B 40. C 65. B 90. B16. D 41. C 66. D 91. A17. C 42. A 67. B 92. D18. A 43. B 68. B 93. A19. B 44. B 69. B 94. A20. D 45. A 70. B 95. C21. A 46. C 71. D22. C 47. C 72. B23. C 48. B 73. B24. D 49. D 74. B25. B 50. D 75. D

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