JEE Main & Advanced Chemistry Analytical Chemistry Question Bank

done Critical Thinking Analytical Total Questions - 20

• question_answer1)
  A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is   [MP PMT 1999]
  A)
  Zinc sulphate done clear
  B)
  Zinc carbonate done clear
  C)
  Lead sulphate done clear
  D)
  Lead carbonate done clear
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• question_answer2)
  A salt on treatment with dil. \[HCl\] gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The salt solution gives a yellow precipitate with potassium chromate. The salt is [MP PET 1996]
  A)
  \[NiS{{O}_{4}}\] done clear
  B)
  \[Ba{{S}_{2}}{{O}_{3}}\] done clear
  C)
  \[Pb{{S}_{2}}{{O}_{3}}\] done clear
  D)
  \[CuS{{O}_{4}}\] done clear
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• question_answer3)
  The salt used for performing 'bead' test in qualitative inorganic analysis is [UPSEAT 2001]
  A)
  \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] done clear
  B)
  \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] done clear
  C)
  \[Na(N{{H}_{4}})HP{{O}_{4}}.4{{H}_{2}}O\] done clear
  D)
  \[CaS{{O}_{4}}2{{H}_{2}}O\] done clear
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• question_answer4)
  Where chlorine water is added to an aqueous solution of potassium halide in presence of chloroform, a violet colour is obtained. 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 [CPMT 1990]
  A)
  Iodide done clear
  B)
  Bromide done clear
  C)
  Chloride done clear
  D)
  Iodide and bromide done clear
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• question_answer5)
  Upon the addition of a solution A to a strongly acidified solution of barium nitrate, a white precipitate was obtained which did not dissolve even after large addition of water. Solution A contained [NCERT 1971]
  A)
  Sodium phosphate done clear
  B)
  Sodium carbonate done clear
  C)
  Sodium sulphate done clear
  D)
  Sodium chloride done clear
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• question_answer6)
  To an acid solution of an anion a few drops of \[KMn{{O}_{4}}\] solution are added. Which of the following, if present will not decolourise the \[KMn{{O}_{4}}\] solution [MP PMT 1997]
  A)
  \[NO_{2}^{-}\] done clear
  B)
  \[{{S}^{2-}}\] done clear
  C)
  \[C{{l}^{-}}\] done clear
  D)
  \[CO_{3}^{2-}\] done clear
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• question_answer7)
  The brown ring test for NO2 and \[N{{O}_{3}}^{-}\]is due to the formation of complex ion with the formula [KCET (Eng./Med.) 2000; Kerala PMT 2004]
  A)
  \[{{\left[ Fe{{\left( {{H}_{2}}O \right)}_{6}} \right]}^{2+}}\] done clear
  B)
  \[{{\left[ Fe\left( NO \right)\text{ }{{\left( CN \right)}_{5}} \right]}^{2+}}\] done clear
  C)
  \[{{\left[ Fe{{\left( {{H}_{2}}O \right)}_{5}}NO \right]}^{2+}}\] done clear
  D)
  \[{{\left[ Fe\left( {{H}_{2}}O \right)\text{ }{{\left( NO \right)}_{5}} \right]}^{2+}}\] done clear
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• question_answer8)
  Mixture is heated with dil. \[{{H}_{2}}S{{O}_{4}}\] and the lead acetate paper turns black by the evolved gases. The mixture contains
  A)
  Sulphite done clear
  B)
  Sulphide done clear
  C)
  Sulphate done clear
  D)
  Thiosulphate done clear
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• question_answer9)
  To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \[N{{H}_{4}}OH\]. However, when \[HCl\] is added to the original solution, a white precipitate is formed. The solution contained [BHU 1973]
  A)
  Lead salt done clear
  B)
  Silver salt done clear
  C)
  Mercurous salt done clear
  D)
  Copper salt done clear
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• question_answer10)
  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 exists in the [NCERT 1981; MP PET 1993]
  A)
  Cationic part done clear
  B)
  Anionic part done clear
  C)
  Both in cationic and anionic parts done clear
  D)
  There is no zinc in the solution done clear
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• question_answer11)
  On performing a borax-bead test with a given inorganic mixture for qualitative analysis, the colour of the bead was found to be emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of  [MP PMT 2001]
  A)
  \[C{{o}^{+2}}\] done clear
  B)
  \[N{{i}^{+2}}~~~~~~\] done clear
  C)
  \[C{{r}^{+3}}\] done clear
  D)
  \[C{{u}^{+2}}\] done clear
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• question_answer12)
  A red solid is insoluble in water. However it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is [AIEEE 2003]
  A)
  \[{{\left( N{{H}_{4}} \right)}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  B)
  \[Hg{{I}_{2}}\] done clear
  C)
  \[HgO\] done clear
  D)
  \[P{{b}_{3}}{{O}_{4}}\] done clear
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• question_answer13)
  An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are [IIT 1996]
  A)
  A colourless filtrate and a green residue done clear
  B)
  A yellow filtrate and a green residue done clear
  C)
  A yellow filtrate and a brown residue done clear
  D)
  A green filtrate and a brown residue done clear
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• question_answer14)
  Phosphoric acid \[\left( {{H}_{3}}P{{O}_{4}} \right)\] is tribasic acid and one of its salts is sodium dihydrogen phosphate \[\left( Na{{H}_{2}}P{{O}_{4}} \right)\]. What volume of 1 M \[NaOH\] solution should be added to 12 g of sodium dihydrogen phosphate (mol. wt. 120) to exactly convert it into trisodium phosphate \[N{{a}_{3}}P{{O}_{4}}\] [Kurukshetra CET 1998]
  A)
  80 ml done clear
  B)
  100 ml done clear
  C)
  200 ml done clear
  D)
  300 ml done clear
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• question_answer15)
  Three separate samples of a solution of a single salt gave these test results : One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. \[NaCl\] solution and one formed a black precipitate with \[{{H}_{2}}S\]. The salt could be [Pb. PMT 1998]
  A)
  \[AgN{{O}_{3}}\] done clear
  B)
  \[Pb{{\left( N{{O}_{3}} \right)}_{2}}\] done clear
  C)
  \[Hg{{\left( N{{O}_{3}} \right)}_{2}}\] done clear
  D)
  \[MnS{{O}_{4}}\] done clear
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• question_answer16)
  10 ml of concentrated \[HCl\] were diluted to 1 litre. 20 ml of this diluted solution required 25 ml of 0.1 N sodium hydroxide solution for complete neutralization, the normality of the concentrated hydrochloric acid will be
  A)
  8.0 done clear
  B)
  9.5 done clear
  C)
  12.5 done clear
  D)
  15.0 done clear
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• question_answer17)
  To a 25 ml of \[{{H}_{2}}{{O}_{2}}\]solution, excess of acidified solution of KI was mixed. The liberated I2 require 20ml of 0.3M hypo solution for neutralization. The volume strength of \[{{H}_{2}}{{O}_{2}}\] will be [MP PET 2003]
  A)
  1.34 ml done clear
  B)
  1.44 ml done clear
  C)
  1.60 ml done clear
  D)
  2.42 ml done clear
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• question_answer18)
  A chemistry student trying to detect the metallic ion in a salt, makes a paste on a clean platinum wire loop of the salt with concentrated \[HCl\]. When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the colour of the flame changes to grassy green. He should, therefore, conclude that the metal is [Manipal MEE 1995]
  A)
  Barium done clear
  B)
  Calcium done clear
  C)
  Potassium done clear
  D)
  Strontium done clear
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• question_answer19)
  A white crystalline substance dissolves in water. On passing \[{{H}_{2}}S\] in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot \[HN{{O}_{3}}\]. On adding a few drops of conc. \[{{H}_{2}}S{{O}_{4}}\] a white precipitate is obtained. This precipitate is that of [CPMT 1990]
  A)
  \[BaS{{O}_{4}}\] done clear
  B)
  \[SrS{{O}_{4}}\] done clear
  C)
  \[PbS{{O}_{4}}\] done clear
  D)
  \[CdS{{O}_{4}}\] done clear
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• question_answer20)
  The best explanation for the solubility of MnS in dil. HCl is that [UPSEAT 2001]
  A)
  Solubility product of\[MnC{{l}_{2}}\]is less than that of MnS done clear
  B)
  Concentration of\[M{{n}^{2+}}\]is lowered by the formation of complex ions with chloride ions done clear
  C)
  Concentration of sulphide ions is lowered by oxidation to free sulphur done clear
  D)
  Concentration of sulphide ions is lowered by formation of the weak acid \[{{H}_{2}}S\] done clear
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