332 + Interview Questions in QUALITATIVE-ANALYSIS IN GENERAL AWARENESS Page 6 InterviewSolution

251.	Which of the following can not evolve more than one gas (vapour) if heated in dry test tube.A. `naNO_(3)(s)`B. `MgCO_(3)(s)`C. `FeSO_(4)(s)`D. `(NH_(4))_(2)Cr_(2)O_(7)(s)`
Answer» Correct Answer - B

Discussion

252.	Which of the following salt liberates a colourless gas on acidification with dil. `H_(2)SO_(4)` ?A. `KNO_(2)`B. `Na_(2)CO_(3)`C. `NaNO_(2)`D. `NaHCO_(3)`
Answer» Correct Answer - B::D

Discussion

253.	Which of the following can decompose on heating to give `CO_(2)` ?A. `Li_(2)CO_(3)`B. `Na_(2)CO_(3)`C. `KHCO_(3)`D. `BaCO_(3)`
Answer» Correct Answer - A::C::D

Discussion

254.	Consider the following reaction, Nitrite + Acetic acid + Thiourea `to Na_(2) uarr + HSCN +2H_(2)O`. Formation of the product in the above reaction can be identified by :A. `FeCl_(3)//` dilute HCl, when blood red colour appears.B. `FeCl_(3)//` dilute HCl, when blue colour appears.C. `K_(2)Cr_(2)O_(7)// HCl`, when green colour appears.D. `KMnO_(4)// HCl`, when colourless solution is formed.
Answer» Correct Answer - A

Discussion

255.	Which of the following salts release reddish brown gas when heated in a dry test tube ?A. `LiNO_(3)`B. `KNO_(3)`C. `Pb(NO_(3))_(2)`D. `AgNO_(3)`
Answer» Correct Answer - A::C::D

Discussion

256.	Which of the following metal chlordie will give chromyl chloride test ?A. NaClB. KClC. AgClD. `SbCl_(3)`
Answer» Correct Answer - A::B

Discussion

257.	`MgSO_(4)` on reaction with `Na_(4)OH` and `Na_(2)HPO_(4)` forms a white crystalline precipitate. What is its formula?A. `Mh(NH_(4))PO_(4)`B. `Mg_(3)(PO_(4))_(2)`C. `MgCl_(2).MgSO_(4)`D. `MgSO_(4)`
Answer» Correct Answer - A

Discussion

258.	Which of the following produce red coloured flame during flame test ?A. `Li`B. `Ca^(2-)`C. `Sr^(2-)`D. `Ba^(2-)`
Answer» Correct Answer - A::B::C

Discussion

259.	Metals which do not give flame test ?A. BeB. LiC. MgD. Ba
Answer» Correct Answer - A::C

Discussion

260.	Metal salts, which respond to Borax bead test ?A. Nickel saltsB. Copper saltsC. Cobalt saltsD. Aluminium salts
Answer» Correct Answer - A::B::C

Discussion

261.	The acidic aqueous solution of ferrous ion forms a brown complex in the presence of `NO_(3)^(Θ)` by the follwing two steps: `[Fe(H_(2)O)_(6)]^(2+) +NO_(3)^(Θ) + H^(o+) rarr … + [Fe(H_(2)O)_(6)]^(3+) + H_(2)O` `[Fe(H_(2)O)_(6)]^(2+) +…rarr… + H_(2)O` Complete and balance the equations .
Answer» Correct Answer - `3[Fe(H_(2)O)_(6)]^(2+)+NO_(3)^(-) +H^(+) to NO +3[Fe(H_(2)O)_(6)]^(3+)` `[Fe(H_(2)O)_(6)]^(2+) + NO to [Fe(H_(2)O)_(5)]^(2+)+H_(2)O`

Discussion

262.	Nitrate is confirmed by ring test. The brown colour of the ring is due to formation ofA. ferrous nitriteB. nitroso ferrous sulphateC. ferrous nitrateD. `FeSO_(4).NO_(2)`
Answer» Correct Answer - C

Discussion

263.	Which statement(s) is /are correct about Brown ring test ?A. This test is given by `NO_(2)^(-) , NO_(3)^(-)` anions.B. Brown ring test depend upon the reduction of `NO_(2)^(-) " and" No_(3)^(-)` to Nitric oxide.C. Brown ring is formed due to formation of `[Fe(H_(2)O)_(5)NO]_(2)(SO_(4)_(3)`D. Charge on NO in brown ring complex is `+1`.
Answer» Correct Answer - A::B::D

Discussion

264.	Nitrate & Nitrite both give brown ring test, can be distinguish by -A. `HOSO_(2)NH_(2)` (Sulphonic acid)B. `NH_(2)HgO.Hgl` ("Million base")C. `FeSO_(4)`D. None
Answer» Correct Answer - A

Discussion

265.	Precipitation occurs whenA. Salt is able to form supersaturated solutionB. Salt is forming a saturated solution.C. Salt if forming unsaturated solutionD. Product of concentration of ions in solution is more than in case of saturated solution
Answer» Correct Answer - 4

Discussion

266.	On heating colourless solid A, gas B (liquid at room temp.) and gas C are formed . A is decomposed by NaOH on heating to form gas D giving white fumes with HCl. Gas C occupies `800ml//g` at N.T.P. Hence A is -A. `NH_(4)NO_(3)`B. `NaNO_(3)`C. `NH_(4)Cl`D. `NH_(4)NO_(2)`
Answer» Correct Answer - 4

Discussion

267.	In the following diagram bunsen flame the (X ) represent. A. Oxidising zoneB. Reducing zoneC. Lower temperature zoneD. Hottest portion of flame
Answer» Correct Answer - B::C

Discussion

268.	The hottest part of the flame of a Bunsen burner is theA. Blue ZoneB. Zone of complete combustionC. Zone fo partial combustionD. All parts of the flame are equally hot.
Answer» Correct Answer - B

Discussion

269.	A salt solution of `Cd^(2+)` in dilute HCl, on treatment with a solution of `BaCl_(2)` gives a white precipitate, which is insoluble in concentrated `HNO_(3)`. Anion in the salt may be :A. `SO_(4)^(2-)`B. `CO_(3)^(2-)`C. `NO_(2)^(-)`D. `S^(2-)`
Answer» Correct Answer - A

Discussion

270.	The brown compound formed in the ring test for nitrates contains the ionA. `[Fe(H_(2)O)_(5)NO]^(3+)`B. `[Fe(H_(2)O)_(5)NO]^(2+)`C. `[Fe(H_(2)O)_(5)NO]^(4+)`D. `[Fe(H_(2)O)_(5)NO]`
Answer» Correct Answer - B

Discussion

271.	How many of following metals impart a characteristic colour to the Bunsen flame ? `(i) Na " " (ii) Li " " (iii) K " " (iv) Ba` `(v) Sr " " (vi) Mg " " (vii) Rb " " (viii) Cs` (ix) `Be " " (x )Ca " " (x i)Cu`
Answer» Correct Answer - 9(All, except vi and ix)

Discussion

272.	A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is :A. `Na_(2)CO_(3)`B. `KNO_(3)`C. `NaNO_(3)`D. `K_(2)CO_(3)`
Answer» Correct Answer - D

Discussion

273.	`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
Answer» Correct Answer - A `Ba^(2+)+SO_(3)^(2-)toBaSO_(3)darr`(white) `BaSO_(3)+2HCl toBaCl_(2)+SO_(2)`(colourless pungent smelling gas)`+H_(2)O` `SO_(3)^(2-)` and `SO_(2)` both act as bleaching agent.

Discussion

274.	The presence of magnesium is confirmed in the qualitative analysis by:A. titan yellow solution +`2M NaOH` solutionB. disodium hydrogen phosphate +`NH_(4)Cl+NH_(3) (aq)`C. magneson `(l)` reagantD. All of these
Answer» Correct Answer - D (A)titan yellow is absorbed by magnesium hydroxide producing a deep-red colour or precipitate. (B)`Mg^(2+) +NH_(3) +HPO_(4)^(2-) to Mg(NH_(4))PO_(4)darr` (white) ( C)Blue lake is formed by the adsorption of reagent on `Mg(OH)_(2)`.

Discussion

275.	A brick red colour is imparted to Bunsen flame by a :A. `Ca` saltB. `Sr` saltC. `Na` saltD. `Co` salt
Answer» Correct Answer - A

Discussion

276.	An aqueous solution of a mixture of two inorganic salts, when treated with dilute `HCl`, gave a precipitate `(P)` and a filtrate `(Q)`.The precipitate `P` was found to dissolve in hot water. The filtrate `(Q)` remained unchanged, when treated with `H_(2)S` in a dilute mineral acid medium. However, it gave a precipitate `(R)` with `H_(2)S` in an ammoniaca medium.The precipitate `R` gave a coloured solution `(S)`, when treated with `H_(2)O_(2)` in an aqueous `NaOH` medium. The coloured solution `S` containsA. `Fe_(2)(SO_(4))_(3)`B. `CuSO_(4)`C. `ZnSO_(4)`D. `Na_(2)CrO_(4)`
Answer» Correct Answer - D

Discussion

277.	Which of the following statements is `//` are correctA. `SbCl_(3)` gives chromyl chloride test along with `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`B. Chronyl chloride on reaction with NaOH gives chromate ion.C. Chromate ion convert to the dichromate ion in acidic medium.D. there is no change in oxidation no. during conversion chromate ion to dichromate ion.
Answer» Correct Answer - B,C,D

Discussion

278.	An aqueous solutio of a salt (A) gives white precipitate with NaCl solution and filtrate of this with `H_(2)S` gives black precipitate . Then which one of the following cations should be present inA. `Hg^(+)`B. `Cu^(+)`C. `Cu^(++)`D. `Pb^(++)`
Answer» Correct Answer - D

Discussion

279.	Sod. Salt. (A)`+` dil. HCl `rarr ` Salt (B) +gas (X). (X) is colourless with suffocating odour and can turn lime water milky. `(B)+K_(2)Cr_(2)O_(7)+` conc. `H_(2)SO_(4)rarr` coloured gas (Y). `(A)+` Sulphur `rarr `Compound (C ). Which of the following is `//` are correct ?A. the oxidation no. of sulphur in (C ) is `+2.5`B. (Y) is `Cl_(2)`C. (Y) is `CrO_(2)Cl_(2)`D. `(X)` is `SO_(2)`
Answer» Correct Answer - A,C,D

Discussion

280.	The blue colour obtained by the addition of excess dil. `NH_(4)OH` to an aqueous solution of a salt containing copper is due to the presence of `:`A. `CuSO_(4)`B. `Cu(OH)_(2)`C. `(NH_(4))_(2)SO_(4)`D. `[Cu(NH_(3))_(4)]^(+2)`
Answer» Correct Answer - D

Discussion

281.	Potassium ferrocyanide is used for testingA. `Cu^(2+)` and `Zn^(2+)`B. `Fe^(3+)` and `Ca^(2+)`C. `Ag^(+)` and `Zn^(2+)`D. `Th^(4+)` and `Cu^(2+)`
Answer» Correct Answer - A,B,C,D (A)`Cu_(2)[Fe(CN)_(6)],K_(2)Zn_(3)[Fe(CN)_(6)]_(2)`, (B)`Fe_(4)[Fe(CN)_(6)]_(3),K_(2)Ca[Fe(CN)_(6)]` (C )`Ag_(4)[Fe(CN)_(6)],K_(2)Zn_(3)[Fe(CN)_(6)]`, (D)`Th[Fe(CN)_(6)],Cu_(2)[Fe(CN)_(6)]`

Discussion

282.	Which of the following statements is/are correct ?A. An aqueous solution of `Co(II)` thiocyanate `(10%` freshly prepared) and mercuric nitrate solution taken in equal volumes on stirring the wall of the vessel with a glass rod produce deep-blue precipitate.B. White precipitate of `Al(OH)_(3)` is soluble in sodium hydroxide as well as in ammonia solutionC. Green precipitate of `Cr(OH)_(3)` readily dissolves in excess of sodium hydroxide forming a green solutionD. Chromium (III) salts give green coloured borax bead in both oxidising and reducing flame.
Answer» Correct Answer - A,C,D (A)`Hg^(2+)+Co^(2+)+4SCN^(-)toCo[Hg(SCN)_(4)]darr`(deep blue), (B)Soluble in `NaOH`forming `[Al(OH)_(4)]^(-)`, not in `NH_(3)(aq)` (C )`Cr(OH)_(3)darr ("green")+OH^(-) hArr [Cr(OH)_(4)]^(-)`(green solution) (D)Correct statement.

Discussion

283.	Which of the following imparts green/apple green colour to the Bunsen flame ?A. Calcium chlorideB. Volatile boron trifluorideC. Barium chlorideD. Ethyl borate
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.

Discussion

284.	`Al^(3+),Fe^(3+),Zn^(2+)` and `Ni^(2+)` ions are present in an acidic solution. Excess of ammonium chloride solution is added followed by addition of ammonium hydroxide solution. The available precipitate will containA. `Zn(OH)_(2)` and `Ni(OH)_(2)`B. `Al(OH)_(2)` and `Fe(OH)_(3)`C. `Zn(OH)_(2)` and `Al(OH)_(3)``Zn(OH)_(2)` and `Al(OH)_(3)`D. `Ni(OH)_(2)` and `Fe(OH)_(3)`
Answer» Correct Answer - B As the concentration of `OH^(-)` ions is less due to common ion effect but enough to precipitate the `III^(rd)` group radicals as hydroxides , as the solubility product of III group hydroxides is lower than IV, V and VI group hydroxides.

Discussion

285.	A gas turns lime water milky and acidified `K_(2)Cr_(2)O_(7)` solution green then gas is :A. `HCl`B. `H_(2)S`C. `SO_(2)`D. `CO_(2)`
Answer» Correct Answer - C

Discussion

286.	`[X]+H_(2)SO_(4) rarr [Y]` a colourless gas with irritating smell `[Y] + K_(2)Cr_(2)O_(7) + H_(2)SO_(4) rarr` green solution `[X]` and `[Y]` areA. `SO_(3)^(2-), SO_(2)`B. `Cl^(-), HCl`C. `S^(2-), H_(2)S`D. `CO_(3)^(2-), CO_(2)`
Answer» Correct Answer - A

Discussion

287.	When a mixture of solid `NaCl` and solid `K_(2)Cr_(2)O_(7)` is heated with concentrated `H_(2)SO_(4)` deep red vapours are obtained.This is due to the formation of:A. chromous chlorideB. chromyl chlorideC. chromic chlorideD. chromic sulphate
Answer» Correct Answer - B

Discussion

288.	AgCl dissolves in ammonia solution givingA. `Ag^(+), NH_(4)^(+) " and" Cl^(-)`B. `[Ag(NH_(3))]^(+) " and" Cl^(-)`C. `[Ag_(2)(NH_(3))]^(2+) " and" Cl^(-)`D. `[Ag(NH_(3))_(2)]^(+) " and" Cl^(-)`
Answer» Correct Answer - D

Discussion

289.	When a mixture of solid NaCl, solid `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` orange red vapours are obtained. These are of the compoundA. chromous chlorideB. chromyl chlorideC. chromic chlorideD. chromic sulphate
Answer» Correct Answer - B

Discussion

290.	A Unknown salt (S) when heated with dil `H_(2)SO_(4)` does not evolve brown vapours but with conc. `H_(2)SO_(4)` brown vapours are obtained. The vapours when brought in contact with `AgNO_(3)` solution do not give any precipitate. The salt (S) contains.A. `NO_(2)^(-)`B. `NO_(3)^(-)`C. `I^(-)`D. `Br^(-)`
Answer» Correct Answer - B

Discussion

291.	A metallic nitrate `(A)` on strong heating leaves behind a residue along with liberation of gases. The metallic nitrate on treatment with `H_(2)S//H^(+)` gives a black precipitate `(B)^(-)` insoluble in hot dilute nitric acid, but the precipitate dissolves in aquaregia. Compound B isA. `Ag_(2)S`B. `CuS`C. `HgS`D. `PbS`
Answer» Correct Answer - C `underset((A))(Hg(NO_(3))_(2))rarrHg+NO_(2)+O_(2)` `darrH_(2)S//H^(+)` `underset((B))(HgS)` `Hg(NO_(3))_(2)+NH_(3)+H_(2)OrarrHgO` `Hg(NH_(2))NO_(3)darr+NH_(4)^(+)`( White ppt of mixed composition)

Discussion

292.	A metallic nitrate `(A)` on strong heating leaves behind a residue along with liberation of gases. The metallic nitrate on treatment with `H_(2)S//H^(+)` gives a black precipitate `(B)^(-)` insoluble in hot dilute nitric acid, but the precipitate dissolves in aquaregia. Compound A isA. `AgNO_(3)`B. `Cu(NO_(3))_(2)`C. `Pb(NO_(3))_(2)`D. `Hg(NO_(3))_(2)`
Answer» Correct Answer - D `underset((A))(Hg(NO_(3))_(2))rarrHg+NO_(2)+O_(2)` `darrH_(2)S//H^(+)` `underset((B))(HgS)` `Hg(NO_(3))_(2)+NH_(3)+H_(2)OrarrHgO` `Hg(NH_(2))NO_(3)darr+NH_(4)^(+)`( White ppt of mixed composition)

Discussion

293.	Pure silver jewellery turns black due to the formation ofA. `Ag_(2)O`B. `Ag(OH)`C. `Ag_(2)S`D. `AgCl`
Answer» Correct Answer - C is correct `4Ag+H_(2)S +O_(2)rarr2AgS+2H_(2)O` (A),(B) and (D) are ruled out because they are not black.

Discussion

294.	`Mn^(2+)+PbO_(2)+"conc."HNO_(3) rarr` Pink colour is due toA. `HMnO_(4)`B. `Pb(NO_(3))_(2)`C. `Mn(NO_(3))_(2)`D. `H_(2)MnO_(4)`
Answer» Correct Answer - A `HMnO_(4)` permanganic acid is formed (B), (C ) and (D ) are not formed.

Discussion

295.	Manganese salt `+ PbO_(2) + `Conc. `HNO_(3) rarr` The solution acquires purple colour. The colour is due toA. `HMnO_(4)`B. a lead saltC. `H_(2)MnO_(4)`D. `Mn(NO_(3))_(2)`
Answer» Correct Answer - 1 `2Mn(NO_(3))_(2)+5PbO_(2)+6HNO_(3)rarr underset("permanganic acid(purple)")(2HMnO_(4))`+2H_(2)O+5Pb(NO_(3))_(2)`

Discussion

296.	When Kl is added to acidified solution fo sodium nitrite,A. NO gas is liberated and `I_(2)` is set freeB. `N_(2)` gas is liberated and HI is producedC. `N_(2)O` gas is liberated and `I_(2)` is set freeD. `N_(2)` gas is liberated and HOI is produced
Answer» Correct Answer - 1 `2I^(-)+4H^(+)+2NO_(2)^(-)rarr2NO+I_(2)+2H_(2)O`

Discussion

297.	(A) `:` Ammonium salts evolve ammonia when heated with NaOH. (R ) `:` Ammonium salts are soluble in water
Answer» Correct Answer - 2 Colourless pungent fumes of HCl are evolved on heating the the chloride with conc. `H_(2)SO_(4)`. `NaCl +H_(2)SO_(4)rarrNaHSO_(4)+HCl`

Discussion

298.	Statement 1 `:` Moist ammonium salts give the smell of ammonia on rubbing between the fingers because Statement 2 `:` Ammonium slats gives ammonia on heating with concentrate NaOH.
Answer» Correct Answer - B Due to formation of ammonia and also with the reaction with NaOH ammonium salt from `NH_(4)OH` which on decomposition give `NH_(3)`.

Discussion

299.	Statement 1 `:` Sb(III) is not precipitated as sulphide when in its alkaline solution `H_(2)S` is passed Statement 2 `:` The concentration of `S^(2-)` ion in alkaline medium is inadequate for precipitation.
Answer» Correct Answer - C Sb(III) is a basic radical of IIB group of which group reagent is `H_(2)S` in presence of dilute HCl. It is necessary to maintain the proper hydrogen ion concentration for the precipitation of IV group cations.

Discussion

300.	When `H_(2)S` gas is passed through `ZnCl_(2)` solution.`ZnS` is not precipitated, why?
Answer» `ZnCl_(2)+H_(2)StoZnS+2HCl` The `HCl` formed dissolves `ZnS`

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following can not evolve more than one gas (vapour) if heated in dry test tube.A. `naNO_(3)(s)`B. `MgCO_(3)(s)`C. `FeSO_(4)(s)`D. `(NH_(4))_(2)Cr_(2)O_(7)(s)`

Which of the following salt liberates a colourless gas on acidification with dil. `H_(2)SO_(4)` ?A. `KNO_(2)`B. `Na_(2)CO_(3)`C. `NaNO_(2)`D. `NaHCO_(3)`

Which of the following can decompose on heating to give `CO_(2)` ?A. `Li_(2)CO_(3)`B. `Na_(2)CO_(3)`C. `KHCO_(3)`D. `BaCO_(3)`

Which of the following salts release reddish brown gas when heated in a dry test tube ?A. `LiNO_(3)`B. `KNO_(3)`C. `Pb(NO_(3))_(2)`D. `AgNO_(3)`

Which of the following metal chlordie will give chromyl chloride test ?A. NaClB. KClC. AgClD. `SbCl_(3)`

`MgSO_(4)` on reaction with `Na_(4)OH` and `Na_(2)HPO_(4)` forms a white crystalline precipitate. What is its formula?A. `Mh(NH_(4))PO_(4)`B. `Mg_(3)(PO_(4))_(2)`C. `MgCl_(2).MgSO_(4)`D. `MgSO_(4)`

Which of the following produce red coloured flame during flame test ?A. `Li`B. `Ca^(2-)`C. `Sr^(2-)`D. `Ba^(2-)`

Metals which do not give flame test ?A. BeB. LiC. MgD. Ba

Metal salts, which respond to Borax bead test ?A. Nickel saltsB. Copper saltsC. Cobalt saltsD. Aluminium salts

The acidic aqueous solution of ferrous ion forms a brown complex in the presence of `NO_(3)^(Θ)` by the follwing two steps: `[Fe(H_(2)O)_(6)]^(2+) +NO_(3)^(Θ) + H^(o+) rarr … + [Fe(H_(2)O)_(6)]^(3+) + H_(2)O` `[Fe(H_(2)O)_(6)]^(2+) +…rarr… + H_(2)O` Complete and balance the equations .

Nitrate is confirmed by ring test. The brown colour of the ring is due to formation ofA. ferrous nitriteB. nitroso ferrous sulphateC. ferrous nitrateD. `FeSO_(4).NO_(2)`

Nitrate & Nitrite both give brown ring test, can be distinguish by -A. `HOSO_(2)NH_(2)` (Sulphonic acid)B. `NH_(2)HgO.Hgl` ("Million base")C. `FeSO_(4)`D. None

Precipitation occurs whenA. Salt is able to form supersaturated solutionB. Salt is forming a saturated solution.C. Salt if forming unsaturated solutionD. Product of concentration of ions in solution is more than in case of saturated solution

On heating colourless solid A, gas B (liquid at room temp.) and gas C are formed . A is decomposed by NaOH on heating to form gas D giving white fumes with HCl. Gas C occupies `800ml//g` at N.T.P. Hence A is -A. `NH_(4)NO_(3)`B. `NaNO_(3)`C. `NH_(4)Cl`D. `NH_(4)NO_(2)`

In the following diagram bunsen flame the (X ) represent. A. Oxidising zoneB. Reducing zoneC. Lower temperature zoneD. Hottest portion of flame

The hottest part of the flame of a Bunsen burner is theA. Blue ZoneB. Zone of complete combustionC. Zone fo partial combustionD. All parts of the flame are equally hot.

A salt solution of `Cd^(2+)` in dilute HCl, on treatment with a solution of `BaCl_(2)` gives a white precipitate, which is insoluble in concentrated `HNO_(3)`. Anion in the salt may be :A. `SO_(4)^(2-)`B. `CO_(3)^(2-)`C. `NO_(2)^(-)`D. `S^(2-)`

The brown compound formed in the ring test for nitrates contains the ionA. `[Fe(H_(2)O)_(5)NO]^(3+)`B. `[Fe(H_(2)O)_(5)NO]^(2+)`C. `[Fe(H_(2)O)_(5)NO]^(4+)`D. `[Fe(H_(2)O)_(5)NO]`

How many of following metals impart a characteristic colour to the Bunsen flame ? `(i) Na " " (ii) Li " " (iii) K " " (iv) Ba` `(v) Sr " " (vi) Mg " " (vii) Rb " " (viii) Cs` (ix) `Be " " (x )Ca " " (x i)Cu`

A colorless salt gives violet colour to Bunsen flame and also turns moisture litmus paper blue. It is :A. `Na_(2)CO_(3)`B. `KNO_(3)`C. `NaNO_(3)`D. `K_(2)CO_(3)`

The presence of magnesium is confirmed in the qualitative analysis by:A. titan yellow solution +`2M NaOH` solutionB. disodium hydrogen phosphate +`NH_(4)Cl+NH_(3) (aq)`C. magneson `(l)` reagantD. All of these

A brick red colour is imparted to Bunsen flame by a :A. `Ca` saltB. `Sr` saltC. `Na` saltD. `Co` salt

An aqueous solutio of a salt (A) gives white precipitate with NaCl solution and filtrate of this with `H_(2)S` gives black precipitate . Then which one of the following cations should be present inA. `Hg^(+)`B. `Cu^(+)`C. `Cu^(++)`D. `Pb^(++)`

The blue colour obtained by the addition of excess dil. `NH_(4)OH` to an aqueous solution of a salt containing copper is due to the presence of `:`A. `CuSO_(4)`B. `Cu(OH)_(2)`C. `(NH_(4))_(2)SO_(4)`D. `[Cu(NH_(3))_(4)]^(+2)`

Potassium ferrocyanide is used for testingA. `Cu^(2+)` and `Zn^(2+)`B. `Fe^(3+)` and `Ca^(2+)`C. `Ag^(+)` and `Zn^(2+)`D. `Th^(4+)` and `Cu^(2+)`

Which of the following imparts green/apple green colour to the Bunsen flame ?A. Calcium chlorideB. Volatile boron trifluorideC. Barium chlorideD. Ethyl borate

A gas turns lime water milky and acidified `K_(2)Cr_(2)O_(7)` solution green then gas is :A. `HCl`B. `H_(2)S`C. `SO_(2)`D. `CO_(2)`

`[X]+H_(2)SO_(4) rarr [Y]` a colourless gas with irritating smell `[Y] + K_(2)Cr_(2)O_(7) + H_(2)SO_(4) rarr` green solution `[X]` and `[Y]` areA. `SO_(3)^(2-), SO_(2)`B. `Cl^(-), HCl`C. `S^(2-), H_(2)S`D. `CO_(3)^(2-), CO_(2)`

When a mixture of solid `NaCl` and solid `K_(2)Cr_(2)O_(7)` is heated with concentrated `H_(2)SO_(4)` deep red vapours are obtained.This is due to the formation of:A. chromous chlorideB. chromyl chlorideC. chromic chlorideD. chromic sulphate

AgCl dissolves in ammonia solution givingA. `Ag^(+), NH_(4)^(+) " and" Cl^(-)`B. `[Ag(NH_(3))]^(+) " and" Cl^(-)`C. `[Ag_(2)(NH_(3))]^(2+) " and" Cl^(-)`D. `[Ag(NH_(3))_(2)]^(+) " and" Cl^(-)`

When a mixture of solid NaCl, solid `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` orange red vapours are obtained. These are of the compoundA. chromous chlorideB. chromyl chlorideC. chromic chlorideD. chromic sulphate

Pure silver jewellery turns black due to the formation ofA. `Ag_(2)O`B. `Ag(OH)`C. `Ag_(2)S`D. `AgCl`

`Mn^(2+)+PbO_(2)+"conc."HNO_(3) rarr` Pink colour is due toA. `HMnO_(4)`B. `Pb(NO_(3))_(2)`C. `Mn(NO_(3))_(2)`D. `H_(2)MnO_(4)`

Manganese salt `+ PbO_(2) + `Conc. `HNO_(3) rarr` The solution acquires purple colour. The colour is due toA. `HMnO_(4)`B. a lead saltC. `H_(2)MnO_(4)`D. `Mn(NO_(3))_(2)`

When Kl is added to acidified solution fo sodium nitrite,A. NO gas is liberated and `I_(2)` is set freeB. `N_(2)` gas is liberated and HI is producedC. `N_(2)O` gas is liberated and `I_(2)` is set freeD. `N_(2)` gas is liberated and HOI is produced

(A) `:` Ammonium salts evolve ammonia when heated with NaOH. (R ) `:` Ammonium salts are soluble in water

Statement 1 `:` Moist ammonium salts give the smell of ammonia on rubbing between the fingers because Statement 2 `:` Ammonium slats gives ammonia on heating with concentrate NaOH.

Statement 1 `:` Sb(III) is not precipitated as sulphide when in its alkaline solution `H_(2)S` is passed Statement 2 `:` The concentration of `S^(2-)` ion in alkaline medium is inadequate for precipitation.

When `H_(2)S` gas is passed through `ZnCl_(2)` solution.`ZnS` is not precipitated, why?