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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.
| 201. |
`Cd^(2+)` and `Cu^(2+)` are seprated by (a) ___formation using (b) ___in which (c ) is more stable then (d ) ____ . On passing `H_(2)S` gas (e ) ____. Is precipitate. |
| Answer» Correct Answer - a.Complex b. KCN c. `K_(3[Cu(CN)_(6)]`d.`K_(4)[Cd(CN)_(6)]` e. `CdS` | |
| 202. |
An aqueous solution of a mixture of two inorganic salt , when reated with diute HCI ,Gave a precipitate (P) and a filrate (Q) .The precipitate P was found to dissolve in hot water .The filrate (Q) remained unchanged , white tracated with `H_(2)S` in a difute mineral acid medium .However it gave a precipitate (R ) with `H_(2)S` in an ammoniacal medium .THe precipitate R give a coloured solution (S ) when treated with `H_(2)O_(2)` to an aq2ueous `NaOH` medium The pracipitate P contain .A. `Pb^(2+)`B. `Hg_(2)^(2+)`C. `Ag^(o+)`D. `Hg^(2+)` |
| Answer» Correct Answer - a | |
| 203. |
Which of the following pairs of ions cannot be seprated by `H_(2)S` in dilate HCl?A. `Bi^(3+) ,Sn^(4+)`B. `Al^(3+) ,Hg^(2+)`C. `Zn^(2+) ,Cu^(2+)`D. `Ni^(2+) ,Cu^(2+)` |
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Answer» Correct Answer - a In the presence of HCI both ions are precipitate by `H_(2)S` `Bi^(3+) + H_(2)S overset(HCI) to underset(Brown)(Bi_(2)S_(3))darr ` `Sn^(4+) + H_(2)S overset(HCI) to underset(yellow)(SnS_(2) darr) |
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| 204. |
Few drop of `HNO_(3)` are added to group if before precoodinh to group III in order to :A. Covert `Fe^(2+)` to `Fe^(3+)`B. Convert` Fe^(3+)` to `Fe^(2+)`C. ppt group IIID. None of these |
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Answer» Correct Answer - a `Fe^(2+)` is oxidised in `Fe^(3+)` in order to precipitate `Fe(OH)_(3)` |
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| 205. |
Which compound is formed when excess of `KCN` is added to an 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)]` |
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Answer» Correct Answer - d `2CuSO_(4) + 10KCN rarr 2K_(3)[Cu(CN)_(4)] + 2K_(2)SO_(4)+ (CN)_(2)` first `Cu(CN)_(2)` is formed which decomposes to form `(CN)_(2)` and `Cu_(2)(CN)_(2). Cu_(2)(CN)_(2)` then combines with KCN to form `K_(3)[Cu(CN)_(4)]` |
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| 206. |
Addition of one drop of `HNO_(3)` in group (III)qanalysis is to (a) _____. |
| Answer» Correct Answer - a. Oxidise `Fe^(2+) to Fe^(3+)` | |
| 207. |
Which of the following anion(s) is/are interfering radicate ?A. `BO_(3)^(3-)`B. `F^(Θ)`C. `PO_(4)^(3-)`D. None of these |
| Answer» Correct Answer - a,b,c | |
| 208. |
Why is a freshly prepared solution of `FeSO_(4)` used for the detection of nitrate and nitrite? |
| Answer» This is because `Fe^(2+)` ions on long standing are oxidised to `Fe^(3+)` ions which are not used for the detection of nitrate or nitrite. | |
| 209. |
An aqaeous solution of `FeSO_(4).Al_(2)(SO_(4))_(2)` and chrome alum is heated with excess of `Na_(2)O_(3)` and chrome alum in heated with excess of `Na_(2)O_(2)` and fiterad .The matrials obtained areA. A colourless fitrate and a green residueB. A yellow fitrate and a green residueC. A yellow fitrate and a brown residueD. A green fitrate and a green brown |
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Answer» Correct Answer - c In the presence of peroxide, chromium ions are oxidised to chromate ions which give a yellow fitrate ferrie ions form brown precipitate of `Fe(OH)_(3)` |
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| 210. |
`CI^(Θ)`is condirned by (a) ____. |
| Answer» Correct Answer - a.Chrumyl chloride test | |
| 211. |
Consider the following reaction Nitrite + acetic acid + thioures `rarr N_(2) + SCoverset(Θ)N + 2H_(2)O` Formation of the product in the reaction cannot be identified byA. `FaCI_(3)//dil, HCI` when blood -red colour appearsB. `FaCI_(3)//dil, HCI` when blue colour appearsC. `K_(2)Cr_(2)O_(7) ,HCI` when green colour appearsD. `KMnO_(4)//HCI` when colourless solution is formed |
| Answer» Correct Answer - b,c,d | |
| 212. |
Which of the following statement (s) is/are correct?A. In `S_(2)O_(3)^(2+)`, both sulphur are different in natureB. Sodium acedact Mn,SN,Fe oxalate giving different type of productC. Aqueous solution of `OCI^(Theta),S^(2-) and CO_(3)^(2-)` are basic in natureD. `NO_(2)^(Theta)` oxidises `I^(Theta)` whereas `Br_(2)` and `CI_(2)` oxidies `NO_(2)^(Theta)` |
| Answer» Correct Answer - a,c | |
| 213. |
`NO_(3)^(Θ)` is detected by (a) _____when (b)_____is formed on the addition of `FeSO_(4)` and cone `H_(2)SO_(4)` |
| Answer» Correct Answer - a.Ring test ,b.`[Fe(H_(2)O)_(3)NO]^(2)` | |
| 214. |
The gas will beA. `CO_(2)`B. `SO_(2)`C. `H_(2)S`D. `SO_(3)` |
| Answer» Correct Answer - b,c | |
| 215. |
Which of the following nittates are water soluble ?A. `NaNO_(3)`B. `AgNO_(3)`C. `Hg(NO_(3))_(2)`D. `LiNO_(3)` |
| Answer» Correct Answer - a,b,c,d | |
| 216. |
When Zn reacts with cone ,`HNO_(3),then Zn(NO_(3)) and NO_(2)` are formed , the reaction (s) involved in this process is/areA. Radox reactionB. Acid base reactionC. Ion exchange reactionD. None |
| Answer» Correct Answer - a,b | |
| 217. |
Which of the following combinations in an aqueous medium will give a yellow ppt. ?A. `AgNO_(3) + NaBr`B. `Pb(CH_(3)COO)_(2) + Na_(2)CrO_(4)`C. `Fe^(3+) + overset(Θ)SCN`D. None of these |
| Answer» Correct Answer - a,b | |
| 218. |
Compound (B) on reaction with `[Na(en)_(3)][NO_(3))_(2)` gives a coloured complex exhibilityA. Optical isomerismB. Geonettical isomeriamC. Linkage isomerismD. No isomerism |
| Answer» Correct Answer - a | |
| 219. |
Which of the following anion may be identified by their ppt reaction in aqueous solution ?A. `CrO_(4)^(2-)`B. `SO_(4)^(2-)`C. `PO_(4)^(3-)`D. `MnO_(4)^(Theta)` |
| Answer» Correct Answer - a,b,c | |
| 220. |
i.(A)`underset(Delta)overset(NaOH)rarr(B)(g) overset(HCI)rarr` While fumes. ii. After (B) is expelled completely, resultant alkline solution again gives gas (B) on heating with zine iii.(A) `overset(Delta)rarr N_(2)O +H_(2)O` Identify AA. `NH_(4)NO_(2)`B. `NH_(4)NO_(3)`C. `HCI`D. `NaSO_(4)` |
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Answer» Correct Answer - b By (iii) (A) gives `N_(2)O + 2H_(2)O` on hence (A) is `NH_(4)NO_(3)` `NH_(4)NO_(3) overset(Delta) to N_(2) O + 2H_(2)O` i. `NH_(4)NO_(3) + NaOH overset(Delta) to NaNO_(3) `+ `overset(NH_(3))underset((B)) + H_(2)O` `NH_(3) + HCI rarr overset(NH_(4)CI)underset("white famus") + H_(2)O` iii`2NaOH + Zn overset(Delta to Na_(2)ZnO_(2) + 2H` `NaNO_(3) + KH overset(Delta)to NaOH + overset(NH_(3))underset((B)) + 2H_(2)O` `(NH_(2)` gas in obtain due to reeduction of `NO_(3)^(Theta))` |
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| 221. |
Which of the following statement is/are correct for gas (D) ? (I)it has the state of hydridisation `sp^(3)` (II)Gas can be identified by `CaCI_(2)` solution (III)Gas can be identified by `Pb(OAc)_(2)` solution (IV)Gas can be identified by passing through solutionA. I,IVB. I,IIIC. III onlyD. I,II,IV |
| Answer» Correct Answer - c | |
| 222. |
Gas (D)`overset(HCI) to `while fumes Gas(B)`overset(AI)underset(Delta)to (E ) overset(H_(2)O) to gas (B)` Identify (A) to (H) and explain reactions. |
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Answer» (A)`(NH_(4))_(2)Cr_(2)O_(7)` (B) `N_(2)` (C )`Cr_(2)O_(3)` (D) `NH_(3)` (E ) `AIN` (F) `CrCI_(3)` (G) `Na_(2)CrO_(4)` (H) `PbCrO_(4)` |
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| 223. |
When `SO_(2)` is passed into suspention of `CaSO_(3)` in water (a) _____ is formed. |
| Answer» Correct Answer - a.`Ca(HSO_(3))_(2)` soluble | |
| 224. |
`CaSO_(4)` in insoluble but is not preciplated when excess of `(NH_(4))_(2)SO_(4)` is added to `CaCI_(2)` explain |
| Answer» `CaSO_(4)+(NH_(4))_(2) SO_(4) rarr (NH_(4))_(2)[Ca(SO_(4))_(2)]` | |
| 225. |
Why is `CaSO_(4)` not precipitated on adding ammonium sulphate to a solution containing `Ca^(2+)` and `Sr^(2+)` ions? |
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Answer» `CaSO_(4)` is not precipitated due to the formation of a complex with `(NH_(4))_(2)SO_(4)` `(CH_(3)COO)_(2)Ca+(NH_(4))_(2)SO_(4)toCaSO_(4)+2CH_(3)COONH_(4)` `CaSO_(4)+(NH_(4))_(2)SO_(4)tounderset(("soluble complex"))((NH_(4))_(2))[Ca(SO_(4))_(2)]` |
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| 226. |
What is the formula of chocolate coloured ppt ?A. `Fe_(4)[Fe(CN)_(6)]`B. `Cu_(2)[Fe(CN)_(6)]`C. `Cu_(4)[Fe(CN)_(6)]`D. `Cu(CN)_(2)` |
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Answer» Correct Answer - b i`CuSO_(4) + BaCI_(2) rarr BaSO_(4) darr + 2HCI` `ii 2CuSO_(4)+4KI to 2K_(2)SO_(4)+underset("white ppt.")(CuI_(2)+I_(2)darr` `I_(2)+2Na_(2)S_(2)O_(3)to 2NaI+Na_(2)S_(4)O_(6)` `(iii) 2Cu^(2+)+K_(4)[Fe(CN)_(6)]to underset("ppt.")underset("(chocolate)")underset("Red-brown")` |
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| 227. |
What is the formula of brown ppt ?A. `Cu_(2)I_(2)`B. `Cu_(2)I_(2) + I_(3)^(Theta)`C. `CuI_(2)`D. `CuSO_(4)` |
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Answer» Correct Answer - b i`CuSO_(4) + BaCI_(2) rarr BaSO_(4) darr + 2HCI` `ii 2CuSO_(4)+4KI to 2K_(2)SO_(4)+underset("white ppt.")(CuI_(2)+I_(2)darr` `I_(2)+2Na_(2)S_(2)O_(3)to 2NaI+Na_(2)S_(4)O_(6)` `(iii) 2Cu^(2+)+K_(4)[Fe(CN)_(6)]to underset("ppt.")underset("(chocolate)")underset("Red-brown")` |
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| 228. |
What is the formula of brown ppt?A. `Fe(OH)_(3)`B. `Fe(OH)_(2)`C. `FeCI_(3)`D. None of these |
| Answer» Correct Answer - a | |
| 229. |
i.(A) `overset(Delta)to ` glassy traparent beat (B) on platinum wire (B) `+ CuSO_(4) rarr ` coloured bead(C ) ii `underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr` green flame iv.Aqueous solution (A) is alkline Identify A .A. `NaNH_(4)HPO_(4).4H_(2)O`B. `NA_(2)B_(4)O_(7).10H_(2)O`C. `CuSO_(4).SH_(2)O`D. None of these |
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Answer» Correct Answer - b i.(A) Forms glassy transpatent beat which is characteristic property of borax `rArr(A)` is borax `(Na_(2)B_(4)O_(7).10H_(2)O)` `Na_(2)B_(4)O_(3)10H_(2)O overset(Delta) to (NaBO_(2) + B_(2)O_(3))/((B) "Glassy bead") + 10H_(2)O` `B_(2)O_(3) + CuSO_(4) overset(Delta)to underset("Coloured bead(C))(Cu(BO_(2))_(2) +SO_(3)uarr` ii `Na_(2)B_(4)O_(3) + H_(2)SO_(4) + 5H_(2)O rarr NA_(2)SO_(4) + 2H_(3)BO_(3)` `H_(#)BO_(3) +3C_(2)H_(5)OH rarr underset("Green flame" (on ignition")(D))((C_(2)H_(5))_(3)BO_(3)+3H_(2)O)` `Na_(2)B_(4)O_(7)+5H_(2)O rarr underset("Weak acid")(2H_(3)BO_(3))+2Na[B(OH)_(4)]` `Na[B(OH)_(4)]` reacts with acid `(HCI)` hence aqueous solution of (A) is alkaline. |
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| 230. |
i.(A) `overset(Delta)to ` glassy traparent beat (B) on platinum wire (B) `+ CuSO_(4) rarr ` coloured bead(C ) ii `underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr` green flame iv.Aqueous solution (A) is alkline Identify D.A. `(CH_(3))_(3)BO_(3)`B. `C_(2)H_(5))_(3)BO_(3)`C. `H_(3)BO_(3)`D. None of these |
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Answer» Correct Answer - b i.(A) Forms glassy transpatent beat which is characteristic property of borax `rArr(A)` is borax `(Na_(2)B_(4)O_(7).10H_(2)O)` `Na_(2)B_(4)O_(3)10H_(2)O overset(Delta) to (NaBO_(2) + B_(2)O_(3))/((B) "Glassy bead") + 10H_(2)O` `B_(2)O_(3) + CuSO_(4) overset(Delta)to underset("Coloured bead(C))(Cu(BO_(2))_(2) +SO_(3)uarr` ii `Na_(2)B_(4)O_(3) + H_(2)SO_(4) + 5H_(2)O rarr NA_(2)SO_(4) + 2H_(3)BO_(3)` `H_(#)BO_(3) +3C_(2)H_(5)OH rarr underset("Green flame" (on ignition")(D))((C_(2)H_(5))_(3)BO_(3)+3H_(2)O)` `Na_(2)B_(4)O_(7)+5H_(2)O rarr underset("Weak acid")(2H_(3)BO_(3))+2Na[B(OH)_(4)]` `Na[B(OH)_(4)]` reacts with acid `(HCI)` hence aqueous solution of (A) is alkaline. |
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| 231. |
i.(A) `overset(Delta)to ` glassy traparent beat (B) on platinum wire (B) `+ CuSO_(4) rarr ` coloured bead(C ) ii `underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr` green flame iv.Aqueous solution (A) is alkline Identify AC.A. `Cu_(3)(PO_(4))_(2)`B. `CuSO_(4)`C. `Cu(BO_(2))_(2)`D. None of these |
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Answer» Correct Answer - c i.(A) Forms glassy transpatent beat which is characteristic property of borax `rArr(A)` is borax `(Na_(2)B_(4)O_(7).10H_(2)O)` `Na_(2)B_(4)O_(3)10H_(2)O overset(Delta) to (NaBO_(2) + B_(2)O_(3))/((B) "Glassy bead") + 10H_(2)O` `B_(2)O_(3) + CuSO_(4) overset(Delta)to underset("Coloured bead(C))(Cu(BO_(2))_(2) +SO_(3)uarr` ii `Na_(2)B_(4)O_(3) + H_(2)SO_(4) + 5H_(2)O rarr NA_(2)SO_(4) + 2H_(3)BO_(3)` `H_(#)BO_(3) +3C_(2)H_(5)OH rarr underset("Green flame" (on ignition")(D))((C_(2)H_(5))_(3)BO_(3)+3H_(2)O)` `Na_(2)B_(4)O_(7)+5H_(2)O rarr underset("Weak acid")(2H_(3)BO_(3))+2Na[B(OH)_(4)]` `Na[B(OH)_(4)]` reacts with acid `(HCI)` hence aqueous solution of (A) is alkaline. |
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| 232. |
Addition of solution of oxalate to an aqueous solution of mixture of `Ba^(2+), Sr^(2+)` and `Ca^(2+)` will precipitate :A. `Ca^(2+)`B. `Ca^(2+)` and `Sr^(2+)`C. `Ba^(2+)` and `Sr^(2+)`D. All the three |
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Answer» Correct Answer - d Oxalates of these metals are insolution |
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| 233. |
`FeC_(2)O_(4)` can decolorise acidified `KMnO_(4)` due to the oxidation of (a) _____and (b)____. |
| Answer» Correct Answer - a. `Fe^(2+)` b. `C_(2)O_(4)^(2-)` | |
| 234. |
The first group reagent is dil HCI, which of the following do not belong to group l?A. `Ag^(o+)`B. `Pb^(2+)`C. `Hg_(2)^(2+)`D. `Cd^(2-)` |
| Answer» Correct Answer - d | |
| 235. |
Identify (A),(B),(C ),(D) and (E ), (A) (black) `+ dil HCI overset(Delta) to (B)` (solution) `+` (C ) (gas) ( C) turns lead aceetain paper black , (B) gives orange ppt (D ) solution in excess of `KI` forming (E ). |
| Answer» (A) `HgS` (B) `HgCI_(2)` (C ) `H_(2)S` (D) `HgI_(2)` (E ) `K_(2)HgI_(4)` | |
| 236. |
The gas librated , on heating a mixture of two salts with `NaOH` give sa reddish brown precipitate with an alkline solution of `K_(2)HgI_(4)` the aqeous solution of the mixture on treatment with `BaCI_(2)` gives awhite precipitate which is sparingly soluble with `K_(2)Cr_(2)O_(7)` and concentrated `H_(2)SO_(4)`red vapour of A are produced .The aqueous solution of the mixture gives a deep -blue colouration B with potassium ferrcyanide soluble identify the redicals in the gives mixture and write the balanced equation in the gives mixture and write the balanced equations for the formation of A and B |
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Answer» The mixture contain `NH_(4)^(Theta) , CI^(Theta) ,SO_(4)^(Theta) ,Fe^*(2+)` i. Gas is clearly ammonia` rArr NH_(4)^(Theta)` is confiemed iiiWhite ppt `overset(HCI)` to sparingly soluble `rArr SO_(4)^(2-)` ion is present iii Red vapour are produced `K_(2)Cr_(2)O_(3) + H_(2)SO_(4) + ? rarr ` REd vapour `(rArr Cr_(2)CI_(2)`chromyl chloride) Hence `CI^(Theta)` ion is present iv Test indicates `Fe^(2+)` `Fe^(2+) + [Fe(CN)_(6)]^(2+) rarr Fe^(3+) + underset("Deep blue")(Fe_(4)[Fe(CN)_(6)]_(3))` |
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| 237. |
`KBr`,on reaction with cone `H_(2)SO_(4)` give reddish brown gas which bleaches moist limus paper .The evolved gas isA. BromineB. Mixture of bromine and HBrC. `HBr`D. `NO_(2)` |
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Answer» Correct Answer - a `KBr + H_(2)SO_(4) rarr KHSO_(4) + HBr` `2HBr +H_(2)SO_(4) rarr Br_(2) + 2H_(2)+S O_(2)` |
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| 238. |
Identify (A) to (H) Mineral `(A) overset(dil.H_(2)SO_(4))rarr(B) +(C) +(D) (gas)` `(D) + (CH_(3)COO)_(2)Pb overset(Delta) to` black ppt `(B) + (C ) overset((D)) to E` (black ppt) separrated from (C ) by fitration `(E) + underset(dil)(HNO_(3)) overset(Delta) to (F)` (blue coloured solution) `(F )+ K_(4)[Fe(CN)_(6)] rarr` chocolate colourer ppt `(C ) + K_(3)[Fe(CN)_(6)] rarr` blue `(H)` |
| Answer» Correct Answer - A: `CuFeS_(2)` B : `CuSO_(4)` C: `FeSO_(4)` D: `H_(2)S` E: `CuS` F: `Cu(NO_(3))_(2)` G : `Cu_(2)[Fe(CN)_(6)]` H: `Kfe^(II)[Fe^(III)(CN)_(6)]` Turnbulls blue | |
| 239. |
`KCI + "conc" H_(2)SO_(4) + K_(2)Cr_(2)O_(7) overset(Delta) to (X) overset(NaOH) to (Y),(X) ` is reddish brown coloured gas soluble in `NaOH` forming `(Y),(X) and (Y) `areA. `Cr_(2)OCI_(2)Na_(2)CrO_(3)`B. `Cr_(2)O_(2)CI_(2)Na_(2)CrO_(3)`C. `CrO_(2)CI_(2)Na_(2)CrO_(6)`D. `CrO_(2)CI_(2)Na_(2)CrO_(4)` |
| Answer» Correct Answer - d | |
| 240. |
`[X] + H_(2)SO_(4) rarr [Y]` colourless gas with irritating smell `[Y] + H_(2)SO_(4) + K_(2)Cr_(2)O_(7) rarr` Green solution `[X]` and`[Y]` areA. `SO_(3)^(2-),SO_(2)`B. `CI^(Theta),HCI`C. `S^(2-),H_(2)S`D. `CO_(3)^(2-),CO_(2)` |
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Answer» Correct Answer - a `[X]+ H_(2)SO_(4) rarr [Y]` colourless gas with irritating smell `[Y] + H_(2)SO_(4) rarr `Green solution Sulphite ions give sulphide dioxide gas with sulpharic acid which turn acidified potassium dichromate to green `SO_(3)^(2-) + H_(2)SO_(4) rarr SO_(2) + H_(2)O + SO_(4)^(2-)` `3SO_(2) + K_(2)Cr_(2)O_(7) + H_(2)SO_(4) rarr K_(2)SO_(4) + underset(Green)((Cr_(2)(SO_(4))_(3))) + H_(2)O` |
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| 241. |
Assertion :In the brown ring test for mixture through we start with `Fe^(II)SO_(4)` , we end up with `[Fe(H_(2)O)_(3)NO]SO_(4)` in which iron is in the `+1` oxidation states Reasion : No transfers its odd electrons to iron (II)A. If both (A) and (B) are correct and (R ) is the correct explqanation of (A)B. If both (A) and (B) are correct but (R ) is not the correct explqanation of (A)C. If (A) is correct ,but (R ) is incorrectD. If (A) is incorrect ,but (R ) is correct |
| Answer» Correct Answer - a | |
| 242. |
a.(A) `+ KBr rarr ` yellow ppt . (B) (A) `+ "conc". H_(2)SO_(4) overset(Delta) to` brown vapours intensifield with cu- turnings. (B) dissolves in lypo forming a soluble complex (C ) what are (A),(B) and (C ) and explain their reactions ? b. `SO_(3)^(2-)` and `SO_(4)^(2-)` both give while ppt with `BaCI_(2)` solution .How is `SO_(3)^(2-)` detected in presence of `SO_(4)^(2-)`? c. `Na_(2)B_(4)O_(7).10 H_(2)O + "conc". H_(2)SO_(4) overset(Delta) to (A) overset(CH_(2)OH Delta) to (B)` idenity (A) and (B) d. (A) `+ dii H_(2)SO_(4) overset(Delta) to gas (B)` Gas (B) turns `K_(2)Cr_(2)O_(7) //H^(Theta)` solution green Aq solution of (A) `+ BaCI_(2) rarr ` while ppt .(C ) Filltrate after removing (C) `+ Br_(2)` water rarr while ppt` dissolve in qammon ium acetate solution Example. |
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Answer» (A) `AgNO_(3) (B) AgBr (C ) Na_(2)[Ag(S_(2)O_(3))_(2)]` b. `BaSO_(4)` is insoluble in cone `HCI` while `BaSO_(3)` remain soluble Soparate `HaSO_(4)` and add `Hr_(2)` water into filrate `So_(3)^(2-)` is axidised to `SO_(4)^(2-)` and given white ppt of `BaSO_(4)` `Br_(2) + H_(2)O rarr 2HBr + O` `BaSO_(3) + O rarr BaSO_(4) darr` c. (A) `H_(2)BO_(3)` (B) `(CH_(3)O)_(3)B` burns with green edges flame d. (A) `SO_(3)^(2-) + SO_(4)^(2-)` (B) :`SO_(2)` (C ) `BaSO_(4)` e. `2CH_(3)COONH_(4) + underset("White ppt".)(PbSO_(4) rarr) underset("Soluble")((CH_(3)COO)_(2)) Pb + (NH_(4))_(2)SO_(4)` |
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| 243. |
Identify (A),(B),(C ) and (D) in the following : Colourless salt (A) `+ "conc" H_(2)SO_(4) rarr ` brawn fames intensifled on adding `Cu` turnings Aqueous solution (A) `+ Cu rarr` blue colour solution (B) and metal (C ) Aquneous soluytion (A) `+ HCI rarr` white ppt soluble in equeous `NH_(3)` forming (D) |
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Answer» (A) `AgNO_(3)` (B) `Cu(NO_(3))_(2)` (C ) `Ag` (D) `[AG(NH_(3))_(2)CI]` |
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| 244. |
`Fe^(2+)._((aq))+NO_(3)^(Θ)._((aq))+H_(2)SO_(4)(conc.)rarr` Brown ring .The oxidation number of iron in brown ring complex is |
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Answer» Correct Answer - 1 `[overset(+1)(Fe)(H_(2)O)_(5)overset(+1)(NO)]^(2+)SO_(4)^(2-)` |
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