JEE Questions for Chemistry Analytical Chemistry Quiz 2 - MCQExams.com

In the analysis of basic radicals, NH4OH and NH4Cl give precipitate with
  • I-group radicals
  • II-group radicals
  • III-group radicals
  • IV-group radicals
Out of Cu2+ , Ni2+ , CO2+ and Mn2+, which is dissolved when H2S is passed through it in the presence of dil. HCl ?
  • Cu2+
  • Ni2+
  • CO2+
  • Mn2+
The only cations present in a slightly acidic solution are Fe3+ , Zn2+ and Cu2+ . The reagent that when added in excess to this solution would identify and separate Fe3+ in one step is
  • 2M HCl
  • 6M NH3
  • 6M NaOH
  • H2S gas
The dark blue colour of the solution formed when excess of ammonia is added to a solution of copper (II) sulphate is due to the presence of the ion
  • [Cu(OH)4(H2O)2]2-
  • [Cu(H2O)6]2+
  • [Cu(NH4)2(H2O)4]4+
  • [Cu(NH3)4(H2O)2]2+
A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is
  • Pb2+
  • Hg2+
  • Cu2+
  • CO2+
Prussian blue is obtained by mixing together aqueous solution of Fe3+ salt with
  • ferricyanide
  • ferrocyanide
  • hydrogen cyanide
  • sodium cyanide
A solution when diluted with H2O and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH4OH/NH4Cl.
  • Zn(OH)2
  • Al(OH)3
  • Mg(OH)2
  • Ca(OH)2
CuSO4 decolourises on addition of KCN, the product is
  • [Cu(CN)4]2-
  • Cu2+ get reduced to form [Cu(CN)4 ]3-
  • Cu(CN)2
  • CuCN
Copper sulphate solution, when added to an excess of ammonium hydroxide, forms a complex compound due to
  • [Cu(NH3)2]2+
  • [Cu(NH3)4]2+
  • [Cu(NH3)6]2+
  • Cu2+
A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange colour solution. The cation of metal nitrate is
  • Hg2+
  • Bi3+
  • Pb2+
  • Cu+
A mixture of salts (Na2SO3 + K2Cr2O7 ) in a test tube is treated with dil. H2SO4 and resulting gas is passed through lime water. Which of the following observations is correct about this test?
  • Solution in test tube becomes green and lime water turns milky
  • Solution in test tube is colourless and lime water turns milky
  • Solution in test tube becomes green and lime water remains clear
  • Solution in test tube remains clear and lime water also remains clear
An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.
The filtrate (Q) remained unchanged, when treated with H2S in dilute mineral acid medium. However, it gave a precipitate (R) with H2S in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with H2O2 in an aqueous NaOH medium.
The precipitate P contains
  • Pb2+
  • 2)
    Chemistry-Analytical Chemistry-891.png
  • Ag+
  • Hg2+
An aqueous solution of a mixture of two inorganic salts, when treated with dilute HCl, gave a precipitate (P) and filtrate (Q). The precipitate P was found to dissolve in hot water.
The filtrate (Q) remained unchanged, when treated with H2S in dilute mineral acid medium. However, it gave a precipitate (R) with H2S in an ammoniacal medium. The precipitate R gave a coloured solution (S ), when treated with H2O2 in an aqueous NaOH medium.
The coloured solution S contains
  • Fe2(SO4)2
  • CuSO4
  • ZnSO4
  • Na2CrO4
If Fe3+ and Cr3+ both are present in group III of qualitative analysis, then distinction can be made by
  • addition of NH4OH in presence of NH4Cl when only Fe(OH)3 is precipitated
  • addition of NH4OH in presence of NH4Cl when Cr(OH)3 and Fe(OH)3 both are precipitated and on adding Br2, water and NaOH, Cr(OH)3 dissolves
  • precipitate of Cr(OH)3 and Fe(OH)3 as obtained in (b) are treated with conc. HCl when only Fe(OH)3 dissolves
  • Both (and (are correct
In the precipitation of the iron group in qualititative analysis, ammonium chloride is added before adding ammonium hydroxide to
  • Decrease concentration of OH– ions
  • Prevent interference by phosphate ions
  • Increase concentration of Cl– ions

  • Chemistry-Analytical Chemistry-893.png
A precipitate of…..would be obtained when HCl is added to a solution of stannous sulphide (SnS) in yellow ammonium sulphide
  • SnS
  • SnS2
  • Sn2S3
  • (NH4)2SnS2
The acidic solution of a salt produced a deep blue colour with starch iodide solution. The salt may be
  • Chloride
  • Nitrite
  • Acetate
  • Bromide
Concentrated nitric acid is added before pro-ceeding to test for group III members. This is to
  • Oxidise any remaing H2S
  • Convert ferrous ion into ferric ion
  • Form nitrates which give granular precipitates
  • Increase ionisation of ammonium hydroxide
Which one of the following nitrate when heated gives off a gas or a mixture of gases which cannot relight a glowing splinter ?
  • Sodium nitrate
  • Ammonium nitrate
  • Lead nitrate
  • Potassium nitrate
When a mixture of solid NaCl, solid K2Cr2O7 is heated with conc. H2SO4, orange red vapours are obtained. These are of the compound
  • Chromous chloride
  • Chromyl chloride
  • Chromic chloride
  • Chromic sulphate
Which of the following sulphides is yellow ?
  • ZnS
  • CdS
  • NiS
  • PbS
Which of the following pairs of ions would be expected to form precipitate when dilute solutions are mixed ?

  • Chemistry-Analytical Chemistry-898.png
  • 2)
    Chemistry-Analytical Chemistry-899.png

  • Chemistry-Analytical Chemistry-900.png

  • Chemistry-Analytical Chemistry-901.png
Nessler’s reagent is
  • K2HgI4
  • K2HgI4 + KOH
  • K2HgI2 + KOH
  • K2HgI4 + KI
The alkaline earth metal that imparts apple green colour to the bunsen flame when introduced in it in the form of its chloride is
  • Barium
  • Strontium
  • Calcium
  • Magnesium
Ferric ion forms a prussian blue coloured ppt. due to
  • K4[Fe(CN)6]
  • Fe4[Fe(CN)6]3
  • KMnO4
  • Fe (OH)3
When NH4Cl is added to a solution of NH4OH
  • The dissociation of NH4OH increases
  • The concentration of OH- increases

  • Chemistry-Analytical Chemistry-904.png
  • The concentration of OH- ion decreases
Which one of the following can be used in place of NH4Cl for the identification of the third group radicals
  • NH4NO3
  • (NH4)2SO4
  • (NH4)2CO3
  • NaCl
The presence of magnesium is confirmed in the qualitative analysis by the formation of a white crystalline precipitate which is due to
  • Mg (HCO3)2
  • MgNH4PO4
  • MgNH4(HCO3)3
  • MgCO3
If NaOH is added to an aqueous solution of zinc ions a white precipitate appears and on adding excess NaOH, The precipitate dissolves. In this solution zinc exist in the
  • Cationic part
  • Anionic part
  • Both in catonic and anionic parts
  • There is no zinc ion in the solution
Colour of nickel chloride solution is
  • Pink
  • Black
  • Colourless
  • Green
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