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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 substances are blue in colour ?A. `Fe(BO_(2))_(2)`B. `CoAl_(2)O_(4)`C. `Co(BO_(2))_(2)`D. `NaCoPO_(4)` |
| Answer» Correct Answer - B,C,D | |
| 52. |
An yellow coloured precipitate `PbCrO_(4)` is insoluble inA. NaOHB. KOHC. `CH_(3)COOH`D. All |
| Answer» Correct Answer - 3 | |
| 53. |
Which of the following substance on heating will give a gas that turns lime water milky ?A. `ZnCO_(3)`B. `Na_(2)CO_(3)`C. `ZnSO_(3)`D. `MgCO_(3)` |
| Answer» Correct Answer - A,C,D | |
| 54. |
On passing `H_(2)S` gas in II group sometimes the solution turns milky. It indicates the presence ofA. oxidising agentB. acidic saltC. thiosulphateD. reducing agent |
| Answer» Correct Answer - 1 | |
| 55. |
On passing `H_(2)S` gas in II group sometimes the solution turns milky. It indicates the presence ofA. An oxidising agentB. Acidic saltC. ThiosulphateD. Reducing agent |
| Answer» Correct Answer - 1 | |
| 56. |
What will happen if to a solution of `Ca(HCO_(3))_(2)` formed by passing the carbon dioxide through a milky solution of `CaCO_(3)` for a longer time, ammonia solution is added? |
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Answer» White precipitate of `CaCO_(3)` is formed. `Ca(HCO_(3))_(2)+2 NH_(3) to (NH_(4))_(2)CO_(3)+CaCO_(3)darr` |
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| 57. |
Write the names of the acidic radicals which can be tested by aqueous solution of barium chloride. |
| Answer» `SO_(3)^(2-)+Ba^(2+)toBaSO_(3)darr("white"),CO_(3)^(2-)+Ba^(2+)toBaCO_(3)darr ("white"),SO_(4)^(2-)+Ba^(2+)toBaSO_(4)darr("white")` | |
| 58. |
A salt mixture contains anions `A^(-) & B^(-)` . To the sodium carbonate extract of the mixture & dil. HCl. Two drops of chlorine water and 2-3 ml of chloroform are added and the mixture shaken. A violet colour is produced. The addition of chlorine water is continued till the violet colour disappears and a reddish brown colour appears. The anions areA. `I^(-) & Br`B. `Br^(-) & I^(-)`C. `I^(-) & Cl^(-)`D. `Cl^(-) & I^(-)` |
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Answer» Correct Answer - A The test is used to identify `Br^(-)` and `I^(-)` when present together. |
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| 59. |
When measured amount of `CN^(-)` is added to a solution of `Cu^(2+)` ions a yellow ppt is formed. The ppt. when slightly heated a gas X is liberated . X isA. `N_(2)`B. `CuCN`C. `(CN)_(2)`D. None of these |
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Answer» Correct Answer - C `CuCN+CN^(-) rarr[Cu(CN)_(4)]^(3-)` |
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| 60. |
Can we perform sodium nitroprusside test for sulphide, if sulphite is also present in sodium carbonate extract of sulphide? |
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Answer» No, as "sodium carbonate extract" of sulphite gives rose red colouration with sodium nitroprusside. `Na_(2)[Fe(CN)_(5)NO]+SO_(3)^(2-)+2Na^(+) to Na_(4)[Fe(CN)_(5)NOSO_(3)]` |
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| 61. |
When sodium carbonate is added in excess to a metal chloride solution followed by the bromine water and then mixture is slightly heated , the solution turns apple green. The metal chloride is `:`A. `NiCl_(2)`B. `CoCl_(2)`C. `CrCl_(2)`D. `FeCl_(3)` |
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Answer» Correct Answer - B `CoCl_(2)+2NaHCO_(3)rarrCo(HCO_(3))_(2)+2NaCl` `CO(HCO_(3))_(2)+4NaHCO_(3)rarrNa_(4)[Co(CO_(3))_(3)]+3H_(2)O+3CO_(2)` `Br_(2)+H_(2)Orarr2HBr+[O]` `2Na_(4)[Co(OC_(3))_(3)]+H_(2)O+[O]rarr2Na_(3)[Co(CO_(3))_(3)]("green")+2NaOH` |
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| 62. |
What will happen if to a white precipitate of `BaSO_(3)`, bromine water is added? |
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Answer» Colour of bromine water is discharged according to the following reaction. `BaSO_(3)+Br_(2)+H_(2)OtoBaSO_(4)darr("white")+2HBr` |
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| 63. |
Statement 1 `:` When conc. `H_(2)SO_(4)` is added to a metal bromide, it gives a coloured gas. Statement 2 `:` Bromide is oxidised to bromine gas by conc. `H_(2)SO_(4)`. |
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Answer» Correct Answer - A `2AgNO_(3)+Na_(2)S_(2)O_(3)rarrAg_(2)S_(2)O_(3)+2NaNO_(3)` `Ag_(2)S_(2)O_(3)+H_(2)O rarr Ag_(2)S+H_(2)SO_(4)` |
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| 64. |
When `H_(2)O_(2)` react with `N_(2)H_(4)` then `H_(2)O_(2)` oxidised `N_(2)H_(4)`. The no. of mole of `H_(2)O_(2)` required to oxidised 64gm `N_(2)H_(4)`. |
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Answer» Correct Answer - 4 `2H_(2)O_(2)rarr2H_(2)O+2[O]` `N_(2)H_(4)+2[O]rarr N_(2)uarr +2H_(2)O` `ul(bar(N_(2)H_(4)+2H_(2)O rarrN_(2)uarr+4H_(2)O))` |
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| 65. |
When small amount of `SnCl_(2)` is added to a solution of `Hg^(2+)` ions, a silky white precipitate is obtained.The silky white precipitate is due to the formation of:A. `Hg_(2)Cl_(2)`B. `SnCl_(4)`C. `Sn`D. `Hg` |
| Answer» Correct Answer - A | |
| 66. |
Potassium when heated strongly in oxygen the it form a (metal oxide),(A). `(A)+CO_(2)rarr "Salt"+(Y)("gas")`. Bond order can gas(Y) is ? |
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Answer» Correct Answer - 2 `K+"air excess"rarr underset((A))(KO_(2))+CO_(2)rarr K_(2)CO_(3)+O_(2)uarr` Bond order of `O_(2)=2, =(10-6)/(4)=(4)/(2)=2` |
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| 67. |
When copper nitrate is strongly heated, it is converted intoA. Cu metalB. cupric oxideC. cuprous oxideD. copper nitrate |
| Answer» Correct Answer - 2 | |
| 68. |
The reagents, `NH_(4)Cl` and aqueous `NH_(3)` will precipitateA. `Ca^(2+)`B. `Al^(3+)`C. `Bi^(3+)`D. `Mg^(2+)` |
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Answer» Correct Answer - B::C |
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| 69. |
Ferric ion forms a Prussian blue coloured precipitate due to fromation ofA. `K_(4)[Fe(CN)_(6)]`B. `Fe_(4)[Fe(CN)_(6)]_(3)`C. `KMnO_(4)`D. `Fe(OH)_(3)` |
| Answer» Correct Answer - B | |
| 70. |
When `NH_(4)Cl` is added to a solution of `NH_(4)OH :`A. the dissociation of `NH_(4)OH` increasesB. the concentration of `OH^(-)` increases.C. the concentration of both `OH^(-)` and `NH_(4)^(+)` increaseD. the concentration of `OH^(-)` ion decreases. |
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Answer» Correct Answer - D `NH_(4)ClhArrNH_(4)^(+)+Cl^(-)" "," "NH_(4)OHhArrNH_(4)^(+)+OH^(-)` Because of common ion effect , the ionisation of `NH_(4)OH` is suppressed. |
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| 71. |
If metal ions of groups III are precipitated by `NH_(4)Cl` and `NH_(4)OH` without prior oxidation by conc. `HNO_(3)`....... is not completely precipitated. |
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Answer» Correct Answer - `Fe^(2+)` |
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| 72. |
When `AgNO_3` is strongly heated, the products formed areA. No and `NO_(2)`B. `NO_(2)` and `O_(2)`C. `NO_(2)` and `N_(2)O`D. NO and `O_(2)` |
| Answer» Correct Answer - B | |
| 73. |
The reagent `NH_4 Cl` and aqueous `NH_3` will precipitateA. `Ca^(2+)`B. `Al^(3+)` and `Fe^(+3)`C. `Mg^(2+)`D. `Ba^(2+)` |
| Answer» Correct Answer - 2 | |
| 74. |
Which of the following sulphides do not dissolve in `50% HNO_(3)` but dissolve in aquaregia ?A. `CoS`B. `NiS`C. `CuS`D. `HgS` |
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Answer» Correct Answer - A,B,D `CuS` dissolves in `50% HNO_(3) , 3CuS+8HNO_(3)to3Cu^(2+)+6NO_(3)^(-) +3S darr +2NOuarr +4H_(2)O` But `NiS, CoS` and `HgS` do not dissolve in `50% HNO_(3)` and dissolve in aquaregia forming their chlorides. |
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| 75. |
When calomel reacts with ammonia solution, a black precipitate is fomed. Write the chemical equation also name the reaction nature. |
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Answer» `Hg_(2)Cl_(2)+2 NH_(4)OHunderset("black")(toubrace(HgNH_(2)Cldarr("white")+Hgdarr("black")))+NH_(4)Cl+2 H_(2)O`, Disproportional reaction. |
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| 76. |
When `NH_(4)Cl` is added to a solution of `NH_(4)OH :`A. increase the solubility product of (III) group saltsB. decrease the solubility product of (III) group saltsC. increase the ionic product of `OH^(-)` and (III) group radicalsD. decrease the degree of ionisation of group reagent |
| Answer» Correct Answer - 4 | |
| 77. |
Which of the following sulphides dissolve in dil HClA. CoSB. NiSC. MnSD. HgS |
| Answer» Correct Answer - 3 | |
| 78. |
A white crystalline substance dissolves in water. On passing `H_2 S` in this solution, a black ppt. is obtained. The black ppt. dissolves completely in hot `HNO_3`. On adding few drops of conc. `H_2 SO_4`, a white ppt. is obtained. The ppt. is that ofA. `BaSO_(4)`B. `SrSO_(4)`C. `PbSO_(4)`D. `CdSO_(4)` |
| Answer» Correct Answer - 3 | |
| 79. |
In the reaction : `H_(2)ShArr2H^(+)+S^(2-)`, when `NH_(4)OH` is added, thenA. The sulphides of IV groups are insoluble in `NH_(4)OH`B. The sulphides of other metals are soluble in `NH_(4)OH`C. The concentrations of `S^(2+)` ions is increasedD. The sulphides of second group are soluble in `NH_(4)OH` |
| Answer» Correct Answer - 3 | |
| 80. |
`CuSO_(4)` decolourises on addition of `KCN`, the product isA. `[Cu(CN)_(4)]^(2-)`B. `Cu^(+2)` reduced to form `[Cu(CN)_(4)]^(3-)`C. `Cu(CN)_(2)`D. CuCN |
| Answer» Correct Answer - 2,4 | |
| 81. |
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 `HNO_(3)`.On adding a few drops of concentrated `H_(2)SO_(4)`, a white precipitate is obtained which is soluble in ammonium acetate.The white precipitate is that of ,A. `BaSO_(4)`B. `SrSO_(4)`C. `PbSO_(4)`D. `Ag_(2)SO_(4)` |
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Answer» Correct Answer - C The white precipitate obtained with `H_(2)SO_(4)` is that of `PbSO_(4)`.The white crystalline substance may be that of `Pb(NO_(3))_(2)`. `Pb^(2+)+S^(2+)to PbS darr ("black"),3PbS darr+8HNO_(3) to 3Pb^(2+)+6NO_(3)^(-) + 3S darr+2NO+4H_(2)O` `Pb^(2+) +SO_(4)^(2-) to PbSO_(4) darr` (white) `PbSO_(4)+2CH_(3)COONH_(4) to (CH_(3)COO)_(2)Pb+(NH_(4))_(2)SO_(4)` `BaS` and `SrS` precipitates are not black in colour.`Ag_(2)SO_(4)` is white precipitate but does not dissolve in ammonium acetate. |
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| 82. |
In third group, bromine water is used to testA. `Fe^(3+)` ionsB. `Cr^(3+)` ionsC. `Al^(3+)` ionsD. All of these |
| Answer» Correct Answer - 2 | |
| 83. |
Ca, Ba and Sr ions are precipitated in fifth group as their -A. OxidesB. SulphatesC. CarbonatesD. Sulphides |
| Answer» Correct Answer - 3 | |
| 84. |
The ion which is not precipitated by `H_2 S` in the presence of HCl isA. `Cu^(2+)`B. `Ag^(+)`C. `Pb^(2+)`D. `Al^(3+)` |
| Answer» Correct Answer - 4 | |
| 85. |
Which of the following is incoluble in excess of NaOH?A. `Al(OH)_(3)`B. `Cr(OH)_(3)`C. `Fe(OH)_(3)`D. `Zn(OH)_(2)` |
| Answer» Correct Answer - 3 | |
| 86. |
The ion that cannot ne precipitated by both `HCl` and `H_(2)S` isA. `Pb^(2+)`B. `Cu^(+)`C. `Ag^(+)`D. `Sn^(2+)` |
| Answer» Correct Answer - 4 | |
| 87. |
The metal ion which is precipitated when `H_(2)S` is passed with HCl isA. `Zn^(2+)`B. `Ni^(2+)`C. `Cd^(2+)`D. `Mn^(2+)` |
| Answer» Correct Answer - 3 | |
| 88. |
Which of the following is not a prelminary test used to detect ions?A. borax bead testB. flame testC. brown ring testD. permanganet test |
| Answer» Correct Answer - 3 | |
| 89. |
When `H_(2)S` is passed through an ammonical salt solution X, a white precipitate is obtained. Then X can be a-A. `Co^(2+)` solutionB. `Mn^(2+)` solutionC. `Ni^(2+)` solutionD. `Zn^(2+)` solution |
| Answer» Correct Answer - 4 | |
| 90. |
An original solution of an inorganic salt in dilute `HCl` gives a brown colouration with potassium hexacyanidoferrate `(III)` and reddish brown colouration with sodium acetate solution.The cation of the salt is:A. `NI^(2+)`B. `Fe^(3+)`C. `Cu^(2+)`D. none |
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Answer» Correct Answer - B `Fe^(3+)+[Fe(CN)_(6)]^(3-)toFe[Fe(CN)_(6)]` brown colouration `3Fe^(3+) + 6CH_(3)COO^(-) + 2H_(2)O hArr [Fe_(3)(OH)_(2)(CH_(3)COO)_(6)]^(+) + 2H^(+)` |
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| 91. |
The metal ion which is precipitated when `H_(2)S` is passed with HCl `:`A. `Zn^(2+)`B. `Ni^(2+)`C. `Cd^(2+)`D. `Mn^(2+)` |
| Answer» Correct Answer - 3 | |
| 92. |
Mercurous ion is represent asA. `Hg_(2)^(2+)`B. `Hg^(2+)`C. `Hg+Hg^(2+)`D. `Hg_(2)^(+)` |
| Answer» Correct Answer - A | |
| 93. |
Do `Fe(III)` salts and `Fe(II)` salts both give red colouration with dimethylglyoxime in ammonical solution. If not then which iron salt gives red colouration with dimethylglyoxime ? |
| Answer» Only `Fe(II)` salts give soluble red irons `(II)` dimethylglyoxime in ammonical solution. | |
| 94. |
Mercurous chloride turns black on treatment with ammonium hydroxide. This is due to the formation ofA. `Hg(NH_(2))Cl`B. `Hg_(2)Cl_(2).NH_(4)OH`C. Hg and `HgNH_(2)Cl`D. `HgCl_(2).NH_(4)OH` |
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Answer» Correct Answer - 3 `underset("mercurous chloride")(Hg_(2)Cl_(2)+2NH_(4)OH)rarr underset("black")overset(Hg+Hg(NH_(2))Cl)(rarr)+NH_(4)Cl+2H_(2)O` |
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| 95. |
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) |
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Answer» Correct Answer - A `Ni^(2+)` and `Fe^(2+)` both on reaction with alkaline solution of dimethyl glyoxime give red precipitate and red solution respectively but not zinc. |
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| 96. |
Solution of a salt in dilute `H_(2)SO_(4)` or acetic acid produces deep blue colour with starch iodide solution.The salt contains:A. `Br^(-)`B. `I^(-)`C. `NO_(3)^(-)`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)COOH to I_(3)^(-)+2NOuarr+4CH_(3)COO^(-)+2H_(2)O` `I_(2)`+starch `to` blue colour |
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| 97. |
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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| 98. |
i) A black mineral (A) on treatment with dilute sodium cyanide of (B) and (C ). ii) The solution of (B) on reaction with zinc gives precipitate of a metal (D). iii) (D) is dissolved in dil. `HNO_(3)` and the resulting solution gives a white precipitate (E) with dil. HCl. iv) (E) on fusion with sodium carbonate gives (D). v) (E) dissolves in aqueous solution ammonia giveing a colourless solution (F). The black mineral (A) isA. `Ag_(2)S`B. `PbS`C. `CuS`D. `HgS` |
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Answer» Correct Answer - A `underset((A))(Ag_(2)S)+underset("dilute solution")(NaCN(aq.))overset("air")(rarr)underset((B))(Na[Ag(CN)_(2)])+underset((C ))(Na_(2)SO_(4))` `2Na[Ag(CN)_(2)]+Zn rarr Na_(2)[Zn(CN)_(4)]+underset((D))(2Ag)` `underset((D))(Ag)+"dil"HNO_(3)Ag^(+) +underset((E))(AgCl(s))` `2AgCl(s)+underset((D))(Na_(2)CO_(3)2Ag)+CO_(2)+2NaCl+O_(2)^(-)` `AgCl(s)+2NH_(3)rarr[Ag(NH_(3))_(2)]Cl` |
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| 99. |
Which of the following statement(s) is/are not correct?A. Nickel salts give rosy red precipitate with dimethyl glyoxime in excess of `NH_(4)OH`B. `Fe(III)` salts give red colour with potassium sulphocyanideC. In nitroprusside the iron and `NO` exists as `Fe(III)` and `NO`D. `Mn (II)` salts give white precipitate with `NaOH` which turns brown on adding `Br_(2)` water. |
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Answer» Correct Answer - C Iron and `NO` exists as `Fe(II)` and `NO^(+)` respectively. |
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| 100. |
i) A black mineral (A) on treatment with dilute sodium cyanide of (B) and (C ). ii) The solution of (B) on reaction with zinc gives precipitate of a metal (D). iii) (D) is dissolved in dil. `HNO_(3)` and the resulting solution gives a white precipitate (E) with dil. HCl. iv) (E) on fusion with sodium carbonate gives (D). v) (E) dissolves in aqueous solution ammonia giveing a colourless solution (F). White ppt (E) is ofA. `CuCl`B. `MnCl_(2)`C. `AgCl`D. `ZnCl_(2)` |
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Answer» Correct Answer - C `underset((A))(Ag_(2)S)+underset("dilute solution")(NaCN(aq.))overset("air")(rarr)underset((B))(Na[Ag(CN)_(2)])+underset((C ))(Na_(2)SO_(4))` `2Na[Ag(CN)_(2)]+Zn rarr Na_(2)[Zn(CN)_(4)]+underset((D))(2Ag)` `underset((D))(Ag)+"dil"HNO_(3)Ag^(+) +underset((E))(AgCl(s))` `2AgCl(s)+underset((D))(Na_(2)CO_(3)2Ag)+CO_(2)+2NaCl+O_(2)^(-)` `AgCl(s)+2NH_(3)rarr[Ag(NH_(3))_(2)]Cl` |
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