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. |
Which of the following sol will be destabilised with ionic impurities - if present?A. Gum sol in waterB. Starch sol in waterC. Egg albumin sol in waterD. `Fe(OH)_(3)` sol in water |
| Answer» Only a lyophobic sols like `Fe(OH)_(3)` will be destabilised by ionic impurities. All others are lyophilic sols. | |
| 52. |
If enthalpy of neutralisation of dil HCl and NaOH(aq) is x then enthalpy of neutralisation of dil. HI and `Ba(OH)_2` (aq) isA. `x//2`B. 2xC. xD. slightly less than x in magnitude |
| Answer» Enthalpy of neutralisation of strong acid and strong base is always constant. HI is a stronger acid than HCl while `Ba(OH)_(2)` is a strong base. | |
| 53. |
Suspended impurities from a colloidal solution of gum in water can be removed byA. filtrationB. dialysisC. electrodialysisD. ultrafiltration |
| Answer» Suspended impurities can be removed from a colloidal solution by filtration through an ordinary filter paper. Colloidal solution can easily pass through an ordinary filter paper. | |
| 54. |
Phenol and acetic acid can be differentiated byA. litmus testB. `NaHCO_(3)` testC. Both (A) and (B)D. None of these |
| Answer» Pehnol and acetic acid can be differentiated by `NaHCO_(3)` test. Only acetic acid gives this test. | |
| 55. |
A colourless salt gives violet colour in bunsen flame, it may beA. `Na_(2)CO_(3)`B. `Na_(2)CrO_(4)`C. `K_(2)CO_(3)`D. `BaCO_(3)` |
| Answer» Potassium imparts violet colour of flame. | |
| 56. |
The salt insoluble in cold water but soluble in boiling water isA. `CaCl_(2)`B. `BaCl_2`C. `SrCl_2`D. `PbCl_(2)` |
| Answer» `PbCl_(2)` is soluble in boiling water. | |
| 57. |
Which of the following sols can only be prepared by boiling the dispersed phase with dispersion medium?A. Egg albumin sol in waterB. Gum sol in waterC. `Fe(OH)_(3)` sol in waterD. Starch sol in water |
| Answer» Starch sol in water can only be prepared by boiling. | |
| 58. |
Which gives violet colour with borax?A. FeB. NiC. CoD. Mn |
| Answer» `Mn^(2+)` gives violet coloured `Mn(BO_2)_(2)` bead. | |
| 59. |
Which of the following sols cannot be prepared by boiling the dispersed phase with dispersion medium (water)?A. Egg albumin sol in waterB. Gum sol in waterC. Starch sol in waterD. none of these |
| Answer» Egg albumin sol, if boiled, will coagulation due to denaturation of the globular proteins present in egg albumin. | |
| 60. |
Which of the following combines with Fe(II) ions to form a brown complex?A. `N_(2)O`B. `NO`C. `N_(2)O_(3)`D. `N_(2)O_(4)` |
| Answer» `[Fe(H_(2)O)_(5)NO]^(2+)` is the formula of the brown ring complex. | |
| 61. |
Excess `H^+` and `Cl^+` ions from a colloidal solution of `Fe(OH)_3` can be removed byA. filtrationB. dialysisC. sublimationD. chromatography |
| Answer» Ionic impurities can be removed from a colloidal solution by dialysis. | |
| 62. |
Potash alum isA. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O`B. `K_(2)SO_(4).Al_2(SO_(4))_(3).18H_(2)O`C. `(NH_(4))_(2)SO_(4).K_(2)SO_(4).24H_(2)O`D. None of these |
| Answer» Potash alum is `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` | |
| 63. |
Presence of `Fe^(3+)` ions in `FeSO_4` can be checked withA. Blue litmus paperB. red litmus paperC. KCNS solutionD. None of these |
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Answer» Only `Fe^(3+)` ions give blood red colouration with `CNS^(-)` ions. `Fe^(3+) +3CNS^(-) to underset("Blood red colouration")(Fe(CNS)_(3))` |
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| 64. |
A few drops of conc. `H_2 SO_4` is added to the solution of `FeSO_4` in water toA. Convert `Fe^(3+)` ions (if any) into `Fe^(2+)` ionsB. prevent salt hydrolysisC. Both (A) and (B)D. None of these |
| Answer» A few drops of conc. `H_(2)SO_(4)` added to a solution of `FeSO_(4)[ "or" Al_(2)(SO_(4))_(3)]` a salt hydrolysis and thus helps in getting a clear solution. | |
| 65. |
Completion of diazotisation can be checked withA. starch paperB. starch -KI paperC. litmus paperD. `K_(2)Cr_(2)O_(7)` paper. |
| Answer» Completion of diazotisation can be checked with starch- KI paper. Excess of `HNO_(2)` in the reaction mixture oxidises KI to `I_(2)` which turns starch blue. | |
| 66. |
Coupling of benzene diazonium chloride and aniline is carried out at pHA. 7B. `10-14`C. `4-5`D. `6-8` |
| Answer» Coupling of benzediazonium chloride and aniline is done under acidic conditions (pH=4-5) | |
| 67. |
Iodine does not react withA. `H_(2)O_(2)`B. `Na_(2)S_(2)O_(3)` (aq)C. StarchD. all the three |
| Answer» Iodine does not react with `H_(2)O_(2)` | |
| 68. |
Iodine can react withA. `Na_(2)S_(2)O_(3) (aq)`B. StarchC. Both (A ) and (B)D. `H_(2)O_(2)` |
| Answer» Iondine reacts with both sodium thiosulphate and iodine. | |
| 69. |
Which is not dissolved in dil. HCl?A. ZnSB. MnSC. `BaSO_(3)`D. `BaSO_4` |
| Answer» `BaSO_(4)` is insoluble in dil. HCl | |
| 70. |
For dissolution of a solid in a liquid, `Delta S` is generallyA. `+ve`B. `+ve`C. zeroD. Both (A) and (B) |
| Answer» Dissolution of a solid in a liquid always lead to an increases in randomness i.e, `DeltaS ` is +ve | |
| 71. |
Which one of the following ionic species will impart colour to an aqueous solution?A. `Te^(4+)`B. `Cu^(+)`C. `Zn^(2+)`D. `Cr^(3+)` |
| Answer» `Cr^(3+)` imparts green colour to its aqueous solution. | |
| 72. |
Which of the following sol will not be destablised with ionic impurities - if present?A. `Fe(OH)_(3)` sol in waterB. Gold sol in waterC. Silver sol in waterD. Starch sol in water |
| Answer» Only a lyphilic sol like starch sol will not be destabilised by ionic impurities. All others are lyophobic sols. | |
| 73. |
For dissolution of an ionic solid in water `Delta_("sol") H^((Theta)) =`A. `Delta_("lattice")H^(Theta)+Delta_(f)H^(Theta)`B. `Delta_(f)H^(Theta)+Delta_(hyd)H^(Theta)`C. `Delta_(a)H^(Theta)+Delta_(f)H^(Theta)`D. none of these |
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Answer» `Delta_("sol") H^(Theta) =Delta_("lattice")H^(Theta)+Delta_(hyd)H^(Theta)` (For dissolution of an ionic solid in water) |
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| 74. |
KI solution identifiesA. `Hg_(2)^(2+)`B. `Pb^(2+)`C. `Ag^(+)`D. `Cu^(2+)` |
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Answer» `Pb^(2+) +2KI to underset("Yellow ppt.")(PbI_(2)) +2K^(+)` `Ag^(+) +KI to underset("Yellow ppt.")(AgI)+K^(+)` |
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| 75. |
Which of the following is (are) soluble in excess of NaOH ?A. `Al(OH)_(3)`B. `Cr(OH)_(3)`C. `Fe(OH)_(3)`D. `Zn(OH)_(2)` |
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Answer» `Al(OH)_(3) +NaOH to underset("Soluble")(NaAlO_(2)) +2H_(2)O` `Zn(OH)_(2) +2NaOH to underset("Soluble")(Na_(2)ZnO_(2)) +2H_(2)O` |
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| 76. |
Which one of the following statements is correct ?A. Maganese salt give biolet borax bead test in the reducing flameB. from a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgClC. Ferric ions give a deep green precipitate on adding potassium ferrocyanide solutionD. On boiling a solution having `K^(+),Ca^(2+)` and `HCO_(3)^(-)` ions we get a precipitate of `K_(2)Ca(CO_(3))_2` |
| Answer» Ammonia dissolves only AgCl from a mixture of AgCl and AgI | |
| 77. |
Calomel `(Hg_(2)Cl_(2))` on reaction with ammonium hydroxide givesA. `HgNH_(2)Cl`B. `NH_(2)-Hg-Hg-Cl`C. `Hg_(2)O`D. HgO |
| Answer» `underset("Calomel")(Hg_(2)Cl_(2))+2NH_(4)OH to underset("Black")(Hg) +underset("White")(Hg(NH_(2))Cl) +2H_(2)O +NH_(4)Cl` | |
| 78. |
Concentrated sodium hydroxide can separate a mixture ofA. `Al^(3+)` and `Cr^(3+)`B. `Cr^(3+)` and `Fe^(3+)`C. `Al^(3+)` and `Zn^(2+)`D. `Zn^(2+)` and `Pb^(2+)` |
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Answer» `Cr^(3+) + 3OH^(-) to underset("Dirty green ppt.")(Cr(OH)_(3)) ` `2Cr(OH)_(3)+4NaOH +3[O] to underset("soluble yellow soluiton")(2Na_(2)CrO_(4))+5H_(2)O` `Fe^(3+) +3OH^(-) to underset("Brown ppt.")(Fe(OH)_(3))` `Fe(OH)_(3)` is not affected by conc. NaOH |
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| 79. |
A metal sulphide which is soluble in water and white in colour isA. CuSB. `Na_(2)S`C. PbSD. ZnS |
| Answer» `Na_(2)S` is colourless and is soluble in water. | |
| 80. |
Which of the following statement is correct?A. `Fe^(2+)` gives brown colour with ammionium thiocyanateB. `Fe^(2+)` gives blue ppt. with potassium ferricyanideC. `Fe^(3+)` gives brown colour with potassium ferrocyanideD. `Fe^(3+)` gives red colour with potassium ferrocyanide |
| Answer» `Fe^(2+)` gives blue colour with potassium ferricyanide. | |
| 81. |
Which of the following is not precipitated as sulphide by passing `H_(2)S` is the presence of conc. HCl ?A. CopperB. ArsenicC. CadmiumD. Lead |
| Answer» Solubility product of CdS is greater than the other sulphides of group II, it is therefore precipitated only on dilution and cannot be precipitated in conc. HCl. | |
| 82. |
Whci of the following is soluble in yellow ammonium sulphide ?A. CuSB. CdSC. SnSD. PbS |
| Answer» `SnS +underset("ammonium sulphide")underset("Yellow")((NH_(4))_(2)S) + S to underset("Soluble")((NH_(4))_(2)SnS_(3)` | |
| 83. |
Which one of the following does not produce metallic sulphide with `H_(2)S`?A. `ZnCl_(2)`B. `CdCl_2`C. `COCl_(2)`D. `CuCl_2` |
| Answer» `CoCl_(2)` does not contain metal ion. | |
| 84. |
`Cu^(2+)` ions will be reduced to `Cu^(+)` ions by the addition of an aqueous solution ofA. KFB. KClC. KID. KOH |
| Answer» `2CuSO_(4) +4KI to underset("Cuprous iodine")(2CuI) +2K_(2)SO_(4)+I_(2)` | |
| 85. |
The complex compound formed with KCN solution is added to solution containing both `Cu^(2+)` and `Cd^(2+)` ions areA. `K_(2)[Cu(CN)_(4)]` and `K_(2)[Cd(CN)_(4)]`B. `K_(3)[Cu(CN)_(4)]` and `[K_(2)[Cd(CN)_(4)]`C. `K_(3)[Cu(CN)_(4)]` and `K_(3)[Cd(CN)_(4)]`D. `K_(2)[Cu(CN)_(4)]` and `K_(3)[Cd(CN)_(4)]` |
| Answer» `Cu^(2+)` forms `K_(3)[Cu(CN)_(4)]` and `Cd^(2+)` forms `K_(2)[Cd(CN)_(4)]` | |
| 86. |
$ `Cu^(2+)` and `Cd^(2+)` are separated by first adding KCN solution and then passing `H_(2)S` gas. ! KCN reduces `Cu^(2+)` to `Cu^(+)` and forms a complex with it.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true. |
| Answer» Correct explanation : KCN forms complex with `Cu^(+)` and `Cd^(2+)` as `K_(3)[Cu(CN)_(4)]` and `K_(2)[Cd(CN)_(4)]` respectively. On passing `H_(2)S` only `Cd^(2+)` complex gets decomposed to yellow CdS ppt. | |
| 87. |
Which of the following sulphates is insoluble in water ?A. `CuSO_(4)`B. `CdSO_(4)`C. `PbSO_(4)`D. `Bi_(2)(SO_(4))_(3)` |
| Answer» `PbSO_(4)` is insoluble in water. | |
| 88. |
Which of the following gives blood red colour with KCNS?A. `Cu^(2+)`B. `Fe^(3+)` ionsC. `Al^(3+)`D. `Zn^(2+)` |
| Answer» `Fe^(3+) +3KCNS to underset("Blood red colour")(Fe(CNS)_(3))+3K^(+)` | |
| 89. |
Diphenylamine reagent gives a deep blue colour with a solution. It containsA. `Sn^(2+)`B. `NO_(2)^(-)`C. `NO_(3)^(-)`D. `Fe^(3+)` |
| Answer» `NO_(2)^(-),NO_(3)^(-)` and `Fe^(3+)` being oxidising agents oxidise diphenylamine giving deep blue colour. | |
| 90. |
By passing `H_(2)S` gas in acidified `KMnO_(4)`, we getA. `K_(2)S`B. SC. `K_(2)SO_3`D. `MnO_(4)` |
| Answer» `H_(2)S + underset(KMnO_(4))underset("From")([O]) to H_(2)O +underset("Colloidal")(S)` | |
| 91. |
Which of the following gives a precipitate with `Pb(NO_(3))_(2)` but not with `Ba(NO_(3))_(2)` ?A. Sodium chlorideB. sodium acetateC. sodium nitrateD. sodium hydrogen phosphate |
| Answer» `2NaCl +Pb(NO_(3))_(2) to underset("White ppt.")(PbCl_(2)) +2NaNO_(3)` | |
| 92. |
Which metal salt gives a violet coloured bead in the borax bead test ?A. `Fe^(2+)`B. `Ni^(2+)`C. `Co^(2+)`D. `Mn^(2+)` |
| Answer» `Mn^(2+)` gives violet coloured bead in borax bead test. | |
| 93. |
$ Phosphates are identified by the yellow precipitate obtained on adding ammonium molybdate solution ! Ammonium phosphomolybdate is a yellow compoud.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is not a correct explanation of AC. A is true but R is falseD. A is false but R is true. |
| Answer» R is correct explanation of A | |
| 94. |
Bromine vapours turn starch iodine paperA. VioletB. BlueC. YellowD. Red. |
| Answer» Bromine liberates `I_(2)` from potassim iodide rurning starch blue. | |
| 95. |
Solution of a salt in dilute `H_2 SO_4` produces deep blue colour with starch iodine solution. The salt containsA. `Br^(-)`B. `I^(-)`C. `NO_(3)^(-)`D. `NO_(2)` |
| Answer» Nitrite ion liberates `I_(2)` from potasium iodide turning starch blue. | |
| 96. |
Which does not give borax bead test?A. `Cr^(3+)`B. `Cu^(2+)`C. `Mn^(2+)`D. `Pb^(2+)` |
| Answer» `Pb^(2+)` is colourless and borax bead test is given by coloured ion such as `Cu^(2+),Mn^(2+),Fe^(2+)` etc. | |
| 97. |
A salt is heated with dilute `H_2 SO_4` and then with conc. `H_2 SO_4`. No reaction takes place. It may beA. NitrateB. SulphideC. OxalateD. sulphate |
| Answer» `SO_(4)^(2-)` does not react with dil. Or conc. `H_(2)SO_(4)` | |
| 98. |
A salt which on hearing with conc. `H_2 SO_4` gives violet vapours isA. sulphateB. bromideC. iodideD. nitrate |
| Answer» `I^(-)` on heating with conc. `H_(2)SO_(4)` gives out violet vapour of iodine . | |
| 99. |
A blue colouration is not obtained whenA. Ammonium hydroxide dissolves in copper sulphateB. copper sulphate solution reacts with `K_(4)[Fe(CN)_(6)]`C. Ferric chloride reacts with sodium ferrocyanideD. Anhydrous white `CuSO_(4)` is dissolved in water |
| Answer» `2CuSO_(4)+K_(4)[Fe(CN)_(6)] to underset("Chocolate ppt.")(Cu_(2)[Fe(CN)_(6)]+2K_(2)SO_(4)` | |
| 100. |
What product is formed by mixing the solution of `K_4 [Fe (CN)_6]` with the solution of `FeCl_2`?A. Ferro ferricyanideB. Ferric ferrocyanideC. FerriferricyanideD. none. |
| Answer» Ferriferrocyanide (Prussian blue) | |