InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A coloured solution known to contain two metal ions of different groups, was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. Drop wise adition of hydrochloric acid to the filtrate produced a white precipitate which dissolved in excess acid. Treatment of the residue from the filter paper with a strong oxidiser, `PbO_(2)` and concentrated `HNO_(3)` on boiling produced a reddish-violet (purple) solution. Indicate any pairs of ions which on testing as above leads to the observed changes.A. `AI^(3+)` and `Mn^(2+)` ionsB. `Mg^(2+)` and `Zn^(2+)` ionsC. `Mn^(2+)` and `Mg^(2+)` ionsD. `Zn^(2+)` and `Mn^(2+)` ions |
| Answer» Correct Answer - A | |
| 52. |
A coloured solution known to contain two metal ions of different groups, was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. Drop wise adition of hydrochloric acid to the filtrate produced a white precipitate which dissolved in excess acid. Treatment of the residue from the filter paper with a strong oxidiser, `PbO_(2)` and concentrated `HNO_(3)` on boiling produced a reddish-violet (purple) solution. Filtrate obtained after separation of white solid contains:A. `[AI(OH)_(4)]^(-)`B. `AI_(2)O_(3)`C. `MnO`D. `Na_(2)MnO_(2)` |
| Answer» Correct Answer - A | |
| 53. |
A coloured solution known to contain two metal ions of different groups, was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. Drop wise adition of hydrochloric acid to the filtrate produced a white precipitate which dissolved in excess acid. Treatment of the residue from the filter paper with a strong oxidiser, `PbO_(2)` and concentrated `HNO_(3)` on boiling produced a reddish-violet (purple) solution. White solid changing to brown is due to formation of:A. `Mn(OH)_(2)`B. `MgO`C. `AI(OH)_(3)`D. `MnO(OH)_(2)` |
| Answer» Correct Answer - D | |
| 54. |
Which of the following metal nitrate produce `NO_(2)` on heating?A. `Hg(NO_(3))_(2)`B. `RbNO_(3)`C. `Pb(NO_(3))_(2)`D. `Cu(NO_(3))_(2)` |
| Answer» Correct Answer - A::C::D | |
| 55. |
A coloured solution known to contain two metal ions of different groups, was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. Drop wise adition of hydrochloric acid to the filtrate produced a white precipitate which dissolved in excess acid. Treatment of the residue from the filter paper with a strong oxidiser, `PbO_(2)` and concentrated `HNO_(3)` on boiling produced a reddish-violet (purple) solution. Reddish-violet solution obtained by oxidation is of:A. `ZnO_(2)^(2-)`B. `MnO_(4)^(2-)`C. `MnO_(4)^(-)`D. `MnO_(2)` |
| Answer» Correct Answer - C | |
| 56. |
A coloured solution known to contain two metal ions of different groups, was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. Drop wise adition of hydrochloric acid to the filtrate produced a white precipitate which dissolved in excess acid. Treatment of the residue from the filter paper with a strong oxidiser, `PbO_(2)` and concentrated `HNO_(3)` on boiling produced a reddish-violet (purple) solution. Reddish-violet (purple) solution is decolourised by:A. both `SO_(3)^(2-),Fe^(2+)`B. both `SO_(4)^(2-),Fe^(3+)`C. both `NO_(3)^(-),Fe^(2+)`D. both `H_(2)O_(2),HCO_(3)^(2-)` |
| Answer» Correct Answer - A | |
| 57. |
Which of the following hydrated salts will not become anhydrous on heating?A. `MgCI_(2).6H_(2)O`B. `FeCI_(3).6H_(2)O`C. `AICI_(3).6H_(2)O`D. `CoCI_(2).6H_(2)O` |
| Answer» Correct Answer - A::B::C | |
| 58. |
The auxiliary reagent in group-IV reagent is:A. `H_(2)S`B. dil.`HCI`C. `NaOH`D. `NH_(4)OH` |
| Answer» Correct Answer - D | |
| 59. |
When compound A (orange red) is heated then green coloured oxide of (B) is formed and inert gas. (C) is formed then select the correct statements:A. Compound (A) is `(NH_(4))_(2)Cr_(2)O_(7)`B. Compound (B) is used in fireworkdC. Gas C is `N_(2)`D. Heating effect of (A) is a type of intramolecular redox reaction |
| Answer» Correct Answer - A::B::C::D | |
| 60. |
Which of the following cation does not give red colour precipitate/solution with dimethylglyoxime (DMG) in alkaline solution?A. `Zn^(+2)`B. `Ni^(+2)`C. `Fe^(2+)`D. Both (a) and (c) |
| Answer» Correct Answer - A | |
| 61. |
When `Ag_(2)CO_(3)` is heated then product will be:A. `Ag_(2)O`B. `Ag`C. `O_(2)`D. `CO_(2)` |
| Answer» Correct Answer - B::C::D | |
| 62. |
A red colouration or precipitate is not obtained when:A. `Fe^(3+)` reacts with potassium thiocyanateB. `Fe^(2+)` reacts with dimethylglyoximeC. `Hg^(2+)` reacts with potassium iodideD. None of the above |
| Answer» Correct Answer - D | |
| 63. |
The precipitate of `Ag_(2)CO_(3)` dissolve in:A. dil. `HNO_(3)`B. `CN^(-)` solutionC. `NH_(3)` solutionD. `HgCI_(2)` |
| Answer» Correct Answer - A::B::C | |
| 64. |
Which of the following precipitate(s) does /do not dissolve in excess of ammonia solution ?A. `Zn(OH)_(2)`B. `Ni(OH)_(2)`C. `AI(OH)_(3)`D. (b) and (c) both |
| Answer» Correct Answer - C | |
| 65. |
Which of the following metal cation gives yellow ppt. with pyrogallol (10% freshly prepared)?A. `Pb`B. `Cu^(+2)`C. `Bi^(+3)`D. All of these |
| Answer» Correct Answer - C | |
| 66. |
Which of the following compound(s) give precipitate of its basic salt with ammonia solution?A. `CuSO_(4)`B. `Hg(NO_(3))_(2)`C. `Bi(NO_(3))_(3)`D. `CdSO_(4)` |
| Answer» Correct Answer - A::B::C | |
| 67. |
Which of the following ppt. is soluble in both aqua regia and sodium disulphide (yellow)?A. `(Hg +HgS)`B. `HgS`C. `CuS`D. `Ag_(2)S` |
| Answer» Correct Answer - A::B | |
| 68. |
Which of the following sulphides do not dissolve in `50% HNO_(3)` but dissolve in aqua regia?A. `CoS`B. `NiS`C. `CuS`D. `HgS` |
| Answer» Correct Answer - A::B::D | |
| 69. |
Which of the following will give the same colour in oxidising flame as well as in the reducing flame in borax bead test (when cold)?A. ChromiumB. CopperC. CobaltD. Nickel |
| Answer» Correct Answer - A::C | |
| 70. |
Which of the following can be used to regulate the concentration of `OH^(-)` ions for the scheme of basic radical analysis (III group)?A. `NH_(4)NO_(3)`B. `NH_(4)CI`C. `(NH_(4))_(2)SO_(4)`D. `(NH_(4))_(2)CO_(3)` |
| Answer» Correct Answer - A::B | |
| 71. |
A (white substance) `overset(Delta)rarr` swells up first `overset("Strong")underset("heating")rarr` contracted into amorphous powder. A is:A. `Na_(2)B_(4)O_(7). 10H_(2)O`B. `Na_(2)B_(4)O_(7)`C. `K_(2)SO_(4).A1_(2)(SO_(4))_(3).24H_(2)O`D. `Na(NH_(4))HPO_(4).4H_(2)O` |
| Answer» Correct Answer - C | |
| 72. |
Which procedure (s) will alow a student to differentiate between solid sodium sulphate and solid sodium sulphite? (P) Make solution of each and look for a precipitate when added to `0.10M Ba(NO_(3))_(2)`. (Q) Add crystals of each to `0.10M HCI` and watch for bubbles. (R) Make solutions of each and test with a pH indicatorA. P onlyB. R onlyC. P and Q onlyD. Q and R only |
| Answer» Correct Answer - D | |
| 73. |
The equilibrium `2Cu^(1) hArr Cu^(0)+Cu^(11)` in aqueous medium at `25^(@)C` shifts towards the left in the presence ofA. `NO_(3)^(-)`B. `CI^(-)`C. `SCN^(-)`D. `CN^(-)` |
| Answer» Correct Answer - A::C::D | |
| 74. |
Which technique is preferred for delivering a solid into a pre-weighed beaker for weighing?A. Transfer more of the reagent than is needed to the beaker. Return the excess of the bottle with a spatulaB. Transfer the desired amount of solid from the reagent bottle by holding the neck of the open bottle over the beaker and tapping the bottle. Then weight the beaker and solidC. Weigh a spatula, scoop the desired amount of solid from the bottle, transfer it to the beaker and reweight the spatulaD. Weight a piece of filter paper, tap the neck of the bottle to transfer solid to the filter paper, weigh the filter paper and transfter the solid to the beaker |
| Answer» Correct Answer - B | |
| 75. |
`[Fe(H_(2)O)_(5)NO]^(2+)` is unstable because:A. it liberates `NO` gas on warmingB. it liberates `NO` gas on shakingC. the charge of central atom is `+1` (relatively low enough)D. none of the above |
| Answer» Correct Answer - C | |
| 76. |
In the following reaction sequence in aqueous solution, the species X,Y and Z, respectively `S_(2)O_(3)^(2-)overset(Ag^(+))(rarr)underset("clear solution")(X)overset(Ag^(+))(rarr)underset("white precipitate")(Y)overset("withtime")(rarr)underset(" black precipitate")(Z)`A. `[Ag(S_(2)O_(3))_(2)]^(3-), Ag_(2)S_(2)O_(3),Ag_(2)S`B. `[Ag(S_(2)O_(3))_(3)]^(5-), Ag_(2)SO_(3),Ag_(2)S`C. `[Ag(SO_(3))_(2)]^(3-),Ag_(2)S_(2)O_(3),Ag`D. `[Ag(SO_(3))_(3)]^(3-), Ag_(2)SO_(4),Ag` |
| Answer» Correct Answer - A | |
| 77. |
A student standardizes a solution of `Na_(2)S_(2)O_(3)` by titrating it against a solution containing a known mass of `NaIO_(3)` that has been dissolved in an excess of a freshly prepared solution of KI in dilute HCI. Which of the following errors will lead to a value of the molarity of the thiosulphate solution that is higher than the true value?A. The student overshoots the endpoint of the titrationB. The `NaIO_(3)` is contamined with `NaCI`C. The `KI//HCI` solution is allowed to stand overnight before it is used in the titrationD. The sample of sodium thiosulphate pentahydrate used to make the `Na_(2)S_(2)O_(3)` solution had partially dehydrated on standing |
| Answer» Correct Answer - B | |
| 78. |
`Na_(2)S_(2)O_(3)+I_(2)rarr` Product isA. `Na_(2)S_(4)O_(6)`B. `Na_(2)SO_(4)`C. `Na_(2)S`D. `Na_(3)ISO_(4)` |
| Answer» Correct Answer - A | |
| 79. |
The species present in solution when `CO_(2)` is dissolved in waterA. `CO_(2),H_(2)CO_(3),HCO_(3)^(-), CO_(3)^(2-)`B. `H_(2)CO_(3),CO_(3)^(2-)`C. `CO_(3)^(2-),HCO_(3)^(-)`D. `CO_(2),H_(2)CO_(3)` |
| Answer» Correct Answer - A | |
| 80. |
Sodium extract is heated with con. `HNO_(3)` before testing for halogens becauseA. `S^(2-)` and `CN^(-)`, if present are decomosed by conc. `HNO_(3)` and hence do not interfere in the testB. `Ag` reacts faster with halides in acidix mediumC. `Ag_(2)S` and `AgCN` are soluble in acidic mediumD. silver halides are totally insoluble in nitric acid |
| Answer» Correct Answer - A | |
| 81. |
A pink coloured salt turns blue on heating. The presence of which cation is most likely?A. `Cu^(2+)`B. `Co^(2+)`C. `Zn^(2+)`D. `Fe^(2+)` |
| Answer» Correct Answer - B | |
| 82. |
Which cation forms an insoluble chloride and an insoluble sulphide?A. `Ba^(2+)`B. `Cu^(2+)`C. `Mn^(2+)`D. `Pb^(2+)` |
| Answer» Correct Answer - D | |
| 83. |
A reddish pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. It on cooling water is added to the residue it turns to its original colour. The substance is:A. iodine crystalsB. copper sulphate crystalsC. cobalt chloride crystalsD. zinc oxide |
| Answer» Correct Answer - C | |
| 84. |
Which compound is formed when excess `KCN` is added to aqueous solution of copper sulphate?A. `Cu(CN)_(2)`B. `K_(2)[Cu(CN)_(4)]`C. `K[Cu(CN)_(2)]`D. `K_(3)[Cu(CN)_(4)]` |
| Answer» Correct Answer - D | |
| 85. |
In the separation of `Cu^(2+)` and `Cd^(2+)` of Iind group in qualitative analysis of cations, tetraamminecopper (II) sulphate and tetramminecadmium (II) sulphate react with KCN to form the corresponding cyano complex. Which one of the following pairs of the complexes and their relative stability enables the separation of `Cu^(2+)` and `Cd^(2+)` ?A. `K_(3)[Cu(CN)_(4)]` more stable and `K_(2)[Cd(CN)_(4)]` less stableB. `K_(3)[Cu(CN)_(4)]` less stable and `K_(2)[Cd(CN)_(4)]` more stableC. `K_(2)[Cu(CN)_(4)]` more stable and `K_(2)[Cd(CN)_(4)]` less stableD. `K_(3)[Cu(CN)_(4)]` less stable and `K_(2)[Cd(CN)_(4)]` more stable |
| Answer» Correct Answer - A | |
| 86. |
When concentrated HCI is added to an aqueous solution of `CoCl_(2) ` . Its colour changes from reddish pink to deep blue . Which complex ion gives blue colour in this reaction ?A. `[Co(H_(2)O)_(6)]^(2+)`B. `[CoCI_(6)]^(3-)`C. `[CoCI_(4)]^(2-)`D. `[CoCI_(6)]^(4-)` |
| Answer» Correct Answer - C | |
| 87. |
Silver is not produced when:A. `AgNO_(3)` solution is treated with Cu rodB. `AgNO_(3)` (ammoniacal solution) reacts with glucoseC. `AgNO_(3)` solution + excess KCN is reacted with Zn dustD. `AgNO_(3)` solution is treated with `Na_(2)S_(2)O_(3)`, followed by heating |
| Answer» Correct Answer - D | |
| 88. |
Which of the following compound is not soluble in conc. `(50%) HNO_(3)`?A. `PbS`B. `(Hg` and `HgS)`C. `Ag_(2)S`D. None of these |
| Answer» Correct Answer - B | |
| 89. |
Choose the correct statements from the following:A. `K_(2)MnO_(4)` is stable in solution at `pH ge 12`.B. `KMnO_(4)` produces the green solution on heating with conc. `NaOH`C. `Sr^(2+)` and `Ba^(2+)` ions can be distinguished by addition of `(Na_(2)CrO +AcOH)` solution.D. All are correct |
| Answer» Correct Answer - D | |
| 90. |
Concentrated solution of which salt gives white precipitate with ferric chloride solution:A. `NaF`B. `Na_(3)S_(2)O_(3)`C. `Na_(2)CO_(3)`D. `CH_(3)COONa` |
| Answer» Correct Answer - A | |
| 91. |
Statement-1 :`Cu^(2+)` and `Cd^(2+)` ions form complexes with excess of potassium cyanide solution. Statement-2 : On passing `H_(2)S` gas, complex `[Cu(CN)_(4)]^(3-)` is not effected but `[Cd(CN)_(4)]^(2-)` gives yellow precipitated.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2- is True, Statement-2 is NOT a correct explanation for Statement-27C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True |
| Answer» Correct Answer - B | |
| 92. |
Statement-1 :`Cu^(2+)` and `Cd^(2+)` ions form complexes with excess of potassium cyanide solution. Statement-2 : On passing `H_(2)S` gas, complex `[Cu(CN)_(4)]^(3-)` is not effected but `[Cd(CN)_(4)]^(2-)` gives yellow precipitated.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2- is True, Statement-2 is NOT a correct explanation for Statement-10C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True |
| Answer» Correct Answer - B | |
| 93. |
Which action should be taken immediately if concentrated sulphuric acid is spilled on the skin?A. It should be rinsed off with large quantities of running waterB. It shouldd be neutralized with solid `CaCO_(3)`C. It should be neutralized with concentration NaOHD. The area of the spil should be wrapped tight with cloth and shown to a health provider. |
| Answer» Correct Answer - A | |
| 94. |
A student wishes to measure `17.3mL` of a standard solution. This can be done best using which container?A. 25mL beakerB. 25mL volumetric pipetC. 25mL buretD. 25mL volumetric flask |
| Answer» Correct Answer - C | |
| 95. |
If an individual spills some `8MH_(2)SO_(4)` on her/his arm, what treatement should be used?A. Neutralize it immediately with a paste of `NaOH` in `H_(2)O`B. Rinse it with `H_(2)O` followed by a dilute solution of `NaHCO_(3)`C. Wash it with a solution of concentrated aqueous `NH_(3)`D. Wrap it tightly with gauze coated with potroleum jelly |
| Answer» Correct Answer - B | |
| 96. |
The apparatus shown would be used to: A. distill a liquidB. reflux a solutionC. filter a precipitateD. chromatograph a mixture |
| Answer» Correct Answer - B | |
| 97. |
Which piece of laboratory equipment should be used to deliver a `10.00mL` sample of acid from a stock container to a flask for a titration?A. `1.0mL` Beral pipet used 10 timesB. 10mL graduated cylinderC. 10mL volumetric pipetD. 25 mL beaker |
| Answer» Correct Answer - C | |
| 98. |
A student is asked to determine the degree of hydration of a salt by finding the mass of a clean dried crucible and lid followed by the mass of the crucible and lid containing a sample of the salt. The crucible, lid and salt are heated in Bunsen burner flame, cooled, and weighed. if the crucible, lid and salt are heated only one instead of the recommended three times, whatwill be the effect on the degree of hydration compared with the actual value?A. Too highB. Too lowC. UnaffectedD. Impossinle to predict |
| Answer» Correct Answer - B | |
| 99. |
A student is asked to dispense `24.70 mL` of a solution with an uncertainty of less than `0.02mL`. Which item should be used for this task?A. 50mL becakerB. 50 mL buretC. 50 mL Erlenmeyer flaskD. 50 mL graduated cylinder |
| Answer» Correct Answer - B | |
| 100. |
Addition of `SnCI_(2)` to `HgCI_(2)` gives a ppt. which is:A. black turning to white silkyB. white silky turning to greyish blackC. white silky turning to redD. black silky turning to green |
| Answer» Correct Answer - B | |