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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.
| 1. |
Which of the following statements is/are correct for chromyl chloride test ?A. Formation of chromyl chloride vapourB. Liberation of chlorine gasC. Formation of lead chromateD. Formation of reddis-brown vapour |
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Answer» Correct Answer - A::C::D `Cl^(-)+K_(2)Cr_(2)O_(7)+H^(+) to underset(("Chromyl chloride"))(CrO_(2)Cl_(2))("red-brown vapour") overset(NaOH)to underset("Yellow" ("sodium chromate"))(Na_(2)CrO_(4)) overset((CH_(3)CO O)_(2)Pb)to underset("Lead chromate" ("Yellow"))(PbCrO_(4))` |
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| 2. |
Which reagent is used to remove `SO_(4)^(2-)` or `Cl^(-)` from water ?A. NaOHB. `Pb(NO_(3))_(2)`C. `BaSO_(4)`D. `KOH` |
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Answer» Correct Answer - B `Pb^(2+)+SO_(4)^(2+) to PbSO darr` (ppt) `Pb^(2+)+Cl^(-) to PbCl_(2) darr` (ppt) Others does not from precipitate with both anions. |
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| 3. |
When solution of KCl, KF and KBr are treated with `I_(2)` ?A. `Cl_(2) " and" Br_(2)` are evolvedB. `Cl_(2)` is evolvedC. `Cl_(2),F_(2) " and" Br_(2)` are evolvedD. None of these |
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Answer» Correct Answer - D `I_(2)` is weak oxidising agent. It does not oxidise the `F^(-),Cl^(-),Br^(-)`. |
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| 4. |
Solution of a salt in dilute `H_(2)SO_(4)` or acetic and produces deep blue colour with starch iodide solution. The salt contains :A. `Br^(-)`B. `I^(-)`C. `Cl^(-)`D. `NO_(2)^(-)` |
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Answer» Correct Answer - D Nitrite ion liberates `I_(2)` from potassium iodide turning starch blue. `2NO_(2)^(-)+3l^(-)+4CH_(3)CO OH to l_(3)^(-) +2NO uarr +4CH_(3)CO O^(-)+2H_(2)O` `l_(2)` + starch `to` blue colour |
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| 5. |
Which of the following combines with Fe(II) ions to form a brown complex ?A. `N_(2)O`B. `NO`C. `N_(2)O_(5)`D. `N_(2)O_(4)` |
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Answer» Correct Answer - B `Fe^(2+) +NO +5H_(2)O to [Fe(H_(2)O)_(5)NO]^(2+)` (brown complex) |
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| 6. |
Which of the following anion(s) is/are easily removed from aqueous solution by precipitation ?A. `Cl^(-)`B. `SO_(4)^(2-)`C. `NO_(3)^(-)`D. `CO_(3)^(2-)` |
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Answer» Correct Answer - A::B::D All nitrate are water soluble. |
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| 7. |
A test tube containing a nitrate and another containing a bromide and `MnO_(2)` are treated with concentrated `H_(2)SO_(4)`. The reddish brown fumes evolved are passed through water. The water will be coloured by :A. the nitrateB. the bromideC. bothD. none of the two |
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Answer» Correct Answer - B `NO_(3)^(-)` gives `NO_(2)` with concentrated `H_(2)SO_(4)` which on passing through water form colourless `HNO_(3)`(l) and `HNO_(2)(l). Br^(-) + MnO_(2)` on heating with concentrated `H_(2)SO_(4)` gives `Br_(2)` gas which on passing through water imparts it a reddish brown colour. |
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| 8. |
In brown ring complex, if number of ambidentate is/are "a" and oxidation state of iron is/are "b" then a+b=? |
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Answer» Correct Answer - 5 `a=0 " " H_(2)O,NO^(+)` are not ambidentate ligand `b=1 " " Fe^(+1)` `a+b=1` |
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| 9. |
Heating which of the following salts in a dry test tube may cause a change in their colour ?A. `ZnCO_(3)` (white)B. `Co(NO_(3))_(2). 6H_(2)O` (red)C. `FeSO_(4).6H_(2)O` (green)D. `MnSO_(4)` (faint pink) |
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Answer» Correct Answer - A::B::C::D `underset("white")(ZnCO_(3)) underset(Delta)to ZnO +CO_(2) uarr . ZnO` in yellow when hot. `Co(NO_(3))_(2).6H_(2)O underset(Delta)to CoO ("black")+2NO_(2)uarr+(1)/(2)O_(2)uarr+6H_(2)O uarr` `2FeSO_(4).6H_(2)O underset(Delta)to Fe_(2)O_(3) ("brown") +SO_(3) uarr + SO_(3)uarr +6H_(2)O uarr` `underset(("faint pink"))(3MnSO_(4)) underset(Delta)to underset(("black"))(Mn_(3)O_(4))+2SO_(2)uarr +SO_(3)uarr` |
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| 10. |
Match List-I with List-II and select the correct answer using the codes given below the lists : A. `{:(P,Q,R,S),(1,3,2,4):}`B. `{:(P,Q,R,S),(3,2,4,1):}`C. `{:(P,Q,R,S),(4,3,2,1):}`D. `{:(P,Q,R,S),(4,1,2,3):}` |
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Answer» Correct Answer - C `1 to IO_(3)^(-)+SO_(2) to I_(2) +SO_(4)^(2-)` `I_(2)+"Starch" to "deep blue colour"` `2 to SO_(2)+MnO_(4^(-)) to underset("colourless")(MnSO_(4))+SO_(4)^(2-)` `3 to Zn+NaOH + SO_(2) to underset("rotten egge smell")(H_(2)Suarr+Zn^(2+))` `4 to CO_(2) +Ca(OH)_(2) to CaCO_(3)darr ("milky")` |
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| 11. |
Which of the following statements is/are incorrect ?A. A filter paper moistened with cadmium acetate solution turns yellow, when brought in contact with `H_(2)S` gas.B. Both carbonate ions as well as bicarbonate ions in the solutions, give reddish-brown precipitate with mercury (II) chloride.C. Sulphites in presence of zinc, reacts with dilute `H_(2)SO_(4)` to liberate `SO_(3)` gas.D. A filter paper moistened with `KIO_(3)` and starch turns blue in contact with `SO_(2)` vapours. |
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Answer» Correct Answer - B::C `(A) Cd^(2+) (aq) +H_(2)S (g) to CdS darr("yellow")+2H^(+)(aq)` `(B) CO_(3)^(2-) +4Hg^(2+)+3H_(2)O to HgCO_(3).3HgO darr ("reddish-brown")+6H^(+)` `HCO_(3^(-))(aq)` does not give precipitate. `(C ) SO_(3)^(2-)+3Zn+8H^(+) to H_(2)S uarr +3Zn^(2+)+3H_(2)O` `(D) 5SO_(2)+2IO_(3^(-))+4H_(2)O to I_(2)+5SO_(4)^(2-)+8H^(+)` |
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| 12. |
Which of the following cominations will give yellowish precipitate in an aqueous medium ?A. `AgNO_(3)+ NaBr`B. `(CH_(3)CO O)_(2)Pb+Na_(2)CrO_(4)`C. `AgCl+Na_(3)AsO_(3)`D. `AgNO_(3)+NaNO_(2)` |
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Answer» Correct Answer - A::B `AgNO_(3)+NaBr to AgBr darr `(Yellow ppt.) `Pb^(2+)+CrO_(4)^(2-) to PbCrO_(4) darr` (Yellow ppt.) `AgCl+Na_(3)AsO_(3) to Ag_(3)AsO_(3)darr` (Yellow ppt.) `Ag^(+) +NO_(2)^(-) to AgNO_(2) darr` (White ppt.) |
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| 13. |
Which of the following reagents can be used for making the distinction between AgCl and Agl ?A. Sodium arsenite solution.B. Dilute ammonia solution.C. Potassium cyanide solution.D. Dilute `HNO_(3)` |
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Answer» Correct Answer - A::B `(A) 3AgCl darr + AsO_(3)^(3-) to Ag_(3)AsO_(3) darr ("yellow")+3Cl^(-)` Agl is unaffected by this treatment. (B) `AgCl +2NH_(3) to [Ag(NH_(3))_(2)]Cl` Agl is not soluble in dilute ammonia solution. (C ) Both soluble in potassium cyanide, forming soluble complexes. (D) Both insoluble in dilute `HNO_(3)`. |
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| 14. |
Which of the following will not react with each other when heated together ?A. `BeO + MgO`B. `Li_(2)CO_(3)+BeO`C. `MgO + CaCO_(3)`D. `MgCO_(3)+Al_(2)O_(3)` |
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Answer» Correct Answer - C `BeO+MgO underset(Delta)to MgBeO_(2)` `Li_(2)CO_(3)+BeO underset(Delta)to Li_(2)BeO_(2)+CO_(2) uarr` `MgCO_(3)+Al_(2)O_(3) underset(Delta)to Mg(AlO_(2))+CO_(2) uarr` |
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| 15. |
Precipitate of `PbSO_(4)` is soluble in :A. ammonium acetate (6M)B. dilute HClC. dilute `H_(2)SO_(4)`D. none of these |
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Answer» Correct Answer - A `PbSO_(4)+2CH_(3)CO ONH_(4) to (NH_(4))_(2)SO_(4)+(Nh_(4))_(2)[Pb(CH_(3)CO O)_(4)]` |
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| 16. |
An aqueous solution of salt containing an acidic radical `X^(-)` reacts with sodium hypochlorite in neutral medium. The gas evolved produces blue black colour spot on the starch paper. The anion `X^(-)` is :A. `CH_(3)CO O^(-)`B. `Br^(-)`C. `l^(-)`D. `NO_(2)^(-)`s |
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Answer» Correct Answer - C `Ocl^(-) +3l^(-)+H_(2)O to l_(3)^(-)+2OH^(-)+Cl^(-)` `l_(3)^(-) + "starch" to ` blue -black spot on starch paper appears due to the formation of iodine-starch adsorption complex. |
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| 17. |
When Ag reacts with conc. HCl, then products will be :A. `AgCl, Cl_(2)`B. `AgCl, H_(2)`C. `AgCl, H_(2), Cl_(2)`D. None of these |
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Answer» Correct Answer - D `E^(@) "SRP of " Ag=0.80 V, E^(@) " SRP of " Cl^(-)=1.36V, E^(@) "SRP of" H^(+)=0.00 V`. So Ag can not oxidize `Cl^(-)` and can not reduce `H^(+)`. |
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| 18. |
What are the products formed when an aqueous solution of magnesium bicarbonate is boiled ?A. `MgCO_(3),H_(2)O,CO_(2)`B. `Mg(HCO_(3))_(2), H_(2)O`C. `Mg(OH)_(2),H_(2)O`D. `Mg, CO, H_(2)O` |
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Answer» Correct Answer - A `2Mg(HCO_(3))_(2) to 2MgCO_(3)+CO_(2)+H_(2)O` |
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| 19. |
When `CS_(2)` layer containing both `Br_(2) " and" I_(2) (2 : 1)` is shaken with excess of chlorine `(Cl_(2))` water, the violet colour due to `I_(2)` disappears and a pale yellow colour appears in the solution. The disappearance of violet colour and appearance of pale yellow colour is due to the formation of :A. `I_(3^(-)) " and" Br_(2)` respectively.B. `HIO_(3)` and BrCl respectively.C. Icl and BrCl respectively.D. `I^(-) " and" Br^(-)` respectively. |
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Answer» Correct Answer - B `5Cl_(2)+I_(2) +6H_(2)O to 2HIO_(3) ("colourless")+10HCl` `Br_(2)+Cl_(2) hArr 2BrCl`(pale yellow) |
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| 20. |
A metal salt solution gives a yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in ammonium hydroxide. The solution containsA. bromde ionsB. iodide ionsC. phosphate ionsD. chromate ions |
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Answer» Correct Answer - C `Ag_(3)PO_(4)` is yellow precipitate which is soluble in both dilute ammonia solution and dilute `HNO_(3)`. `HPO_(4)^(2-)+3Ag^(+) to Ag_(3)PO_(4) darr +H^(+)` `Ag_(3)PO_(4)+2H^(+) to H_(2)PO_(4^(-)) darr+2Ag^(+)`, `Ag_(3)PO_(4)darr +6NH_(3) to 3[Ag(NH_(3))_(2)]^(+) +PO_(4)^(3-)` Pale yellow precipitate of AgBr is not soluble in dilute `HNO_(3)`, bright yellow precipitate of Agl is not soluble in both, `Ag_(2)CrO_(4)` is obtained as red precipitate. |
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| 21. |
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. `HNO_(3)`. The anion could be `:`A. `CO_(3)^(2-)`B. `Cl^(-)`C. `SO_(3)^(2-)`D. `S^(2-)` |
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Answer» Correct Answer - B `NaCl+AgNO_(3) to AgCl darr ("white") + NaNO_(3), Ag_(2)S darr("black")`. `Ag_(2)CO_(3) " and" Ag_(2)SO_(3)` dissolves in dilute `HNO_(3)` liberating `CO_(2) " and" SO_(2)` respectively. Both `Ag_(2)CO_(3) " and" Ag_(2)SO_(3)` are white . AgCl is white but insoluble in dilute `HNO_(3)`. NaCl solution is neutral to litmus as it is a salt of strong acid and strong base. |
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| 22. |
A substance on treatment with dilute `H_(2)SO_(4)` liberates a colourless gas which produces `(I)` turbidity with baryta water and `(ii)` turns acidified dichromate solution green. The reaction indicates the presence of `:`A. `CO_(3)^(2-)`B. `S^(2-)`C. `SO_(3)^(2-)`D. `NO_(2)^(-)` |
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Answer» Correct Answer - C `SO_(3)^(2-) +Ba(OH)_(2) to BaSO_(3) darr ("white")+2OH^(-)` `3SO_(2)+Cr_(2)O_(7)^(2-)+2H^(+) to 2Cr^(3+) ("green colour solution")+3SO_(4)^(2-) +H_(2)O` |
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| 23. |
`BaCl_(2)` solution gives a white precipitate with a solution of a salt, which dissolves in dilute hydrochloric acid with the evolution of colourless, pungent smelling gas. The gas as well as the salt both are used as bleaching agent in the textile industries. The salt contains :A. sulphiteB. sulphideC. acetateD. carbonate |
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Answer» Correct Answer - A `Ba^(2+) +SO_(3)^(2-) to BaSO_(3) darr ("white")` `BaSO_(3)+2HCl to BaCl_(2) + SO_(2)("colourless pungent smelling gas") +H_(2)O` `SO_(3)^(2-) " and" SO_(2)` both act as bleaching agent. |
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| 24. |
Which one of the following ions does not give borax bead test :A. `Cr^(3+)`B. `Cu^(2+)`C. `Mn^(2+)`D. `Zn^(2+)` |
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Answer» Correct Answer - D `Zn^(2+)` is colourless and borax bead test is given by coloured ions such as `Cu^(2+), Mn^(2+), Fe^(3+)` etc. |
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| 25. |
NaCl, NaBr, NaI mixture on adding conc. `H_(2)SO_(4)` gives gases, respectively :A. HCl, HBr, HIB. `HCl, Br_(2),I_(2)`C. `Cl_(2), Br_(2),I_(2)`D. None of these |
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Answer» Correct Answer - B HBr and HI are strong reducing agents and are oxidized by `H_(2)SO_(4) " to " Br_(2) " and" I_(2)`, respectively. |
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| 26. |
When `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` and soluble chloride such as KCl :A. red vapours of `CrO_(2)Cl_(2)` are evolvedB. `Cl^(-)` ion is oxidized to `Cl_(2)` gasC. `CrCl_(3)` is formedD. `Cr_(2)O_(7)^(2-)` ion is reduced to green `Cr^(3+)` ion |
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Answer» Correct Answer - A `KCl +H_(2)SO_(4)+K_(2)Cr_(2)O_(7) to CrO_(2)Cl_(2)` (Chromyl Chloride test) |
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| 27. |
A brick red colour is imparted Bunsen flame by a :A. Ca saltB. Sr saltC. Na saltD. Co salt |
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Answer» Correct Answer - A Ca salts impart brick red colour to the flame. |
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| 28. |
A white solid imparts a violet colour to a Bunsen flame. On being heated with concentrated `H_(2)SO_(4)`, the solid gives violet vapours that turn starch paper blue. The salt may be :A. KIB. NaIC. `MgI_(2)`D. `CaBr_(2)` |
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Answer» Correct Answer - A `K to` violet colour in flame test `2I^(-) + conc. H_(2)SO_(4) to HI + SO_(4)^(2-) , HI+ H_(2)SO_(4) to I_(2) +H_(2)O+SO_(2)` `I_(2) + "starch" to " blue colour"` |
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| 29. |
Which of the following imparts green/apple green colour to the Bunsen flame ?A. Calcium chlorideB. Volatile boron trifluorideC. Barium chlorideD. Ethoxy borate |
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Answer» Correct Answer - B::C::D `BF_(3)` colour the flame green, `B(OC_(2)H_(5))_(3)` burns with green edged flame, Barium chloride (volatile)gives apple green colour to flame. |
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| 30. |
Which of the following statements is/are incorrect (I) Filter paper moistened with cadmium acetate and lead acetate turn black and yellow respectively, when brought in contact with `H_(2)S` gas. (II) Sulphites in presence of Zinc, reacts with dilute `H_(2)SO_(4)` to liberate `H_(2)S` gas. (III) Stability of carbonates decrease with increasing metallic character. (IV) Borax bead test is responded generally by p and d block metal salts. (V) Sodium chloride on heating with aqueous solution of `K_(2)Cr_(2)O_(7)` and concentrated `H_(2)SO_(4)` produced white fumes. |
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Answer» Correct Answer - 4(I),(III),(IV) &(V) (I) `Pb^(+2)+H_(2)S to underset("black")(PbS)darr` `Cd^(+2)+H_(2)S to underset("yellow")(CdS darr)` (II) `Zn+H_(2)SO_(4)+SO_(3)^(-) to H_(2)S uarr +Zn^(2+)` (III) Stability of carbonate `prop` metallic character (IV) Borax bead test is responded by d-block metal salt. (V) `NaCl+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to CrO_(2)Cl_(2) uarr +Cr^(3+) +SO_(4)^(2-)` |
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| 31. |
When `H_(2)S` gas is passed through an ammonical salt solution X, a slightly white precipitate is formed. The X can be :A. a cobalt saltB. a lead saltC. a zinc saltD. a silver salt |
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Answer» Correct Answer - C `Zn^(2+)+H_(2)S to ZnS darr ("white")+2H^(+)` |
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