Description : 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 vapou
Last Answer : A Unknown salt (S) when heated with dil `H_(2)SO_(4)` does not evolve brown vapours but with conc. `H_(2)SO_(4)` ... 3)^(-)` C. `I^(-)` D. `Br^(-)`
Description : I. `H_(2)S` reduces acidified `KMnO_(4)` to `MnSO_(4)` II. `H_(2)S` reduces acidified `K_(2)Cr_(2)O_(7)` to red colour `Cr_(2)(SO_(4))_(3)` III. `H_(2
Last Answer : I. `H_(2)S` reduces acidified `KMnO_(4)` to `MnSO_(4)` II. `H_(2)S` reduces acidified `K_(2)Cr_(2) ... and III C. only II and III D. I,II,III and IV
Description : When `H_(2)O_(2)` is reacted with `K_(2)Cr_(2)O_(7)" in dilute "H_(2)SO_(4)` and then ether is added. The ether layer gets -colour
Last Answer : When `H_(2)O_(2)` is reacted with `K_(2)Cr_(2)O_(7)" in dilute "H_(2)SO_(4)` and then ether ... layer gets -colour A. Red B. Yellow C. Blue D. Green
Description : The oxidation state of sulhur in `H_(2)SO_(5)` and chromium in `K_(2)Cr_(2)O_(7)` respectively is :-
Last Answer : The oxidation state of sulhur in `H_(2)SO_(5)` and chromium in `K_(2)Cr_(2)O_(7)` respectively is :- A. 8, 6 B. 4, 6 C. 8, 8 D. 6, 6
Description : `[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]` are
Last Answer : `[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 ... 2-), H_(2)S` D. `CO_(3)^(2-), CO_(2)`
Description : A compound 'X' of the formula `C_(3)H_(8)O` gives iodoform test. On oxidation with acidified `K_(2)Cr_(2)O_(7)X` gave Y. Y also gives iodogorm test. T
Last Answer : A compound 'X' of the formula `C_(3)H_(8)O` gives iodoform test. On oxidation with acidified `K_(2)Cr_(2) ... ` D. `CH_(3)COCH_(3), CH_(3)CHOHCH_(3)`
Description : `SO_(2)` reduces acidified `K_(2)Cr_(2)O_(7)` to
Last Answer : `SO_(2)` reduces acidified `K_(2)Cr_(2)O_(7)` to A. `Cr_(2)(SO_(2))_(3)` B. `CrO_(3)` C. `Cr_(2)O_(3)` D. chromium
Description : Which of the following is not formed when `H_(2)S` reacts acidic `K_(2)Cr_(2)O_(7)` solution ?
Last Answer : Which of the following is not formed when `H_(2)S` reacts acidic `K_(2)Cr_(2)O_(7)` solution ? A. `CrSO_(4)` B. ... (4))_(3)` C. `K_(2)SO_(4)` D. `S`
Description : An aqueous solution of a gas (X) gives the following reactions : (i) It decolourizes an acified `K_(2)Cr_(2)O_(7)`. (ii) On boiling with `H_(2)O_(2)`,
Last Answer : An aqueous solution of a gas (X) gives the following reactions : (i) It decolourizes an acified `K_(2)Cr_(2)O_(7)` ... B. `SO_(3)` C. `CO_(2)` D. `CO`
Description : In the titration of `K_(2)Cr_(2)O_(7)` and ferrous sulphate, following data is obtained: `V_(1)` mL of `K_(2)Cr_(2)O_(7)` solution of molarity `M_(1)`
Last Answer : In the titration of `K_(2)Cr_(2)O_(7)` and ferrous sulphate, following data is obtained: `V_(1)` mL of `K_(2)Cr_ ... V_(2)` D. `M_(1)V_(1)=M_(2)V_(2)`
Description : How many are redox reaction- `{:((i),K_(4)[Fe (CN)_(6)] + "conc."H_(2)SO_(4) overset(Delta)rarr,(ii),"conc." H_(2)SO_(4) + KCl rarr),((iii),"conc." H_
Last Answer : How many are redox reaction- `{:((i),K_(4)[Fe (CN)_(6)] + "conc."H_(2)SO_(4) overset(Delta)rarr,(ii)," ... ,((ix),"conc." H_(2)SO_(4) + Cu rarr,,):}`
Description : Which of the following compounds can be used for drying of `H_(2)S` gas? I. Conc `H_(2)SO_(4)` II. `P_(4)O_(10)` III. Anhydrous `CaC1_(2)` IV. Anhydro
Last Answer : Which of the following compounds can be used for drying of `H_(2)S` gas? I. Conc `H_(2)SO_(4)` II. ` ... IV B. only I C. only II and III D. only III
Description : Three different solutions of oxidising agents `KMnO_(4),K_(2)Cr_(2)O_(7) " and "I_(2)` is titrated separately with 0.158 gm of `Na_(2)S_(2)O_(3)`. If
Last Answer : Three different solutions of oxidising agents `KMnO_(4),K_(2)Cr_(2)O_(7) " and "I_(2)` is ... D. all three oxidising agent can act as self indicator.
Description : Assertion :- In acidic medium, equivalent weight of `K_(2)Cr_(2)O_(7)` is equal to `294//6`. Reason :- In acidic medium, `Cr_(2)O_(7)^(-2)` is reduced
Last Answer : Assertion :- In acidic medium, equivalent weight of `K_(2)Cr_(2)O_(7)` is equal to `294//6`. ... is False. D. If both Assertion & Reason are False.
Description : `K_(2)Cr_(2)O_(7)` react with hydrazins to form product. The oxidation state of Cr in the product will be :-
Last Answer : `K_(2)Cr_(2)O_(7)` react with hydrazins to form product. The oxidation state of Cr in the product will be :- A. `+4` B. `+3` C. `+5` D. `+2`
Description : One mole of acidified `K_(2)Cr_(2)O_(7)` on reaction with excess of KCl will liberate….., moles of `I_(2)`.
Last Answer : One mole of acidified `K_(2)Cr_(2)O_(7)` on reaction with excess of KCl will liberate….., moles of `I_(2)`. A. 6 B. 1 C. 7 D. 3
Description : If equal volumes of `0.1 M KMnO_(4)` and `0.1 M K_(2)Cr_(2)O_(7)` solutions are allowed to oxidise `Fe^(2+)` to `Fe^(3+)` in acidic medium, then `Fe^(
Last Answer : If equal volumes of `0.1 M KMnO_(4)` and `0.1 M K_(2)Cr_(2)O_(7)` solutions are allowed to ... O_(7)` C. equal in both cases D. cannot be determined.
Description : A 100 mL sample of water was treated to convert any iron present to `Fe^(2+)`. Addition of 25 mL of 0.002 M `K_(2)Cr_(2)O_(7)` resulted in the reactio
Last Answer : A 100 mL sample of water was treated to convert any iron present to `Fe^(2+)`. Addition of 25 ... parts per million (ppm) of iron in the water sample.
Description : How many mL of 0.3M `K_(2)Cr_(2)O_(7)` (acidic) is required for complete oxidation of 5 mL of 0.2 M `SnC_(2)O_(4)` solution.
Last Answer : How many mL of 0.3M `K_(2)Cr_(2)O_(7)` (acidic) is required for complete oxidation of 5 mL of 0.2 M `SnC_(2)O_(4)` solution.
Description : 25 mL of a solution of `Fe^(2+)` ions was titrated with a solution of the oxidizing agent `Cr_(2)O_(7)^(2-)` . 50 mL of 0.01 M `K_(2)Cr_(2)O_(7)` solu
Last Answer : 25 mL of a solution of `Fe^(2+)` ions was titrated with a solution of the oxidizing agent `Cr_(2)O_ ... is the molarity of the `Fe^(2+)` solution ?
Description : A gas turns lime water milky and acidified `K_(2)Cr_(2)O_(7)` solution green then gas is :
Last Answer : 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)`
Description : In the nitration of benzene with a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)`, the active species involved is :
Last Answer : In the nitration of benzene with a mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)`, ... ion B. nitrate ion C. nitronium ion D. nitrogen dioxide
Description : Reddis-brown gas is obtained when the following are treated with conc. `H_(2)SO_(4)` ?
Last Answer : Reddis-brown gas is obtained when the following are treated with conc. `H_(2)SO_(4)` ? A. `Br^(-)` B. `NO_(2)^(-)` C. `NO_(3)^(-)` D. `SO_(3)^(2-)`
Description : Oxidation number of P in `PO_(4)^(3-)`, of S in `SO_(4)^(2-)` and that of `Cr_(2)O_(7)^(2-)` are respectively
Last Answer : Oxidation number of P in `PO_(4)^(3-)`, of S in `SO_(4)^(2-)` and that of `Cr_(2)O_(7)^(2-)` are ... . `+3, +6 and +5` D. `+5, +3, and +6`
Description : Determine the equivalent weights of the following salts: `(a) NaCl" " (b) K_(2)SO_(4) " " Ca_(3)(PO_(4))_(2)`
Last Answer : Determine the equivalent weights of the following salts: `(a) NaCl" " (b) K_(2)SO_(4) " " Ca_(3)(PO_(4))_(2)`
Description : How many compound(s) or iron (s) can be oxidised by `H_(2)O_(2)` among the following (i) `AsO_(3)^(2)` (ii) `SO_(4)^(2-)` (iii) `Fe_(2) (SO_(4))_(3)`
Last Answer : How many compound(s) or iron (s) can be oxidised by `H_(2)O_(2)` among the following (i) `AsO_(3)^(2)` (ii) ... ` (v) `H_(2)S` (vi) PbS (vii) `O_(3)`
Description : An element `A` in a compound `ABD` has oxidation number `A^(n-)`. It is oxidised by `Cr_(2)O_(7)^(2-)` in acid medium. In the experiment `1.68xx10^(-3
Last Answer : An element `A` in a compound `ABD` has oxidation number `A^(n-)`. It is oxidised by `Cr_(2)O_(7)^(2-)` in acid ... is: A. 3 B. 3-n C. n-3 D. `+n`
Description : Which of the following is produced during the following reaction ? `CO(g)+H_(2)overset(575K)underset(ZnO,Cr_(2)O_(3))rarr` ……?
Last Answer : Which of the following is produced during the following reaction ? `CO(g)+H_(2)overset(575K)underset(ZnO,Cr_(2)O_ ... 3)COOH` C. `HCOOH` D. `CH_(3)OH`
Description : Which of the following yields But-2 ene on dehydration with conc.`H_(2)SO_(4)`?
Last Answer : Which of the following yields But-2 ene on dehydration with conc.`H_(2)SO_(4)`? A. 2-Methyl-2- ... 2-Propanol C. 2-Methyl-2-propanol D. Butan-2-ol
Description : Aniline reacts with mixed acid (conc. `HNO_(3)` and conc. `H_(2)SO_(4)`) at 288 K to give P (51%), Q (47%) and R(2%). The major product (s) of the fol
Last Answer : Aniline reacts with mixed acid (conc. `HNO_(3)` and conc. `H_(2)SO_(4)`) at 288 K to give P ... of the following reaction sequence is (are) B. C. D.
Description : which one of the following salts will evolve halogen on treatment with conc. `H_(2)SO_(4)` ?
Last Answer : which one of the following salts will evolve halogen on treatment with conc. `H_(2)SO_(4)` ? A. (A) NaCI B. KI C. (C) NaBr D. (D) none of these
Description : Which of the following complexes will be dehydrated to relatively minimum extent by conc. `H_(2)SO_(4)` under identical condition .
Last Answer : Which of the following complexes will be dehydrated to relatively minimum extent by conc. `H_(2)SO_(4)` under ... O)_(6)]Cl_(3)` D. all of these
Description : `B_(3)^(3-)+Conc.H_(2)SO_(4)+CH_(3)-CH_(2)-OH overset(ignite)rarr(A)` What is the oxidation number of central atom that is responsible for green flame
Last Answer : `B_(3)^(3-)+Conc.H_(2)SO_(4)+CH_(3)-CH_(2)-OH overset(ignite)rarr(A)` What is the ... atom that is responsible for green flame in compound `(A)`?
Description : Which of the following anion behaves in a different manner than other on heating with conc. `H_(2)SO_(4)` ?
Last Answer : Which of the following anion behaves in a different manner than other on heating with conc. `H_(2)SO_(4) ... Br^(-)` D. All behave in a similar manner
Description : Which of the following pair of anions are identified by conc. `H_(2)SO_(4)`.
Last Answer : Which of the following pair of anions are identified by conc. `H_(2)SO_(4)`. A. `NO_(3)^(-), CO_(3)^(2-)` B. ... -)` D. `CO_(3)^(2-), CH_(3)CO O^(-)`
Description : If addition of conc. `H_(2)SO_(4)` is made to an unknown salt, a colourless and odouriess gas is produced then which of the following can be present ?
Last Answer : If addition of conc. `H_(2)SO_(4)` is made to an unknown salt, a colourless and odouriess gas is produced then which ... C. `Cl^(-)` D. `NO_(3)^(-)`
Description : Which anion does not liberate any gas with dilute as well as conc. `H_(2)SO_(4)`.
Last Answer : Which anion does not liberate any gas with dilute as well as conc. `H_(2)SO_(4)`. A. `NO_(2)^(-)` B. `NO_(3)^(-)` C. `SO_(3)^(2-)` D. `SO_(4)^(2-)`
Description : Which is dehydrated to maximum extent using conc. `H_(2)SO_(4)`?
Last Answer : Which is dehydrated to maximum extent using conc. `H_(2)SO_(4)`? A. B. C. D.
Description : Phenol when condensed with phthalic anhydride in the presence of conc. `H_(2)SO_(4)`, yields `,`
Last Answer : Phenol when condensed with phthalic anhydride in the presence of conc. `H_(2)SO_(4)`, yields ... orange B. Phenolphthaline C. Aspirin D. Methyl Blue
Description : `"phenol" overset(conc.H_(2)SO_(4))rarrA overset(conc.HNO_(3))rarrB` Here A and B are respectively.
Last Answer : `"phenol" overset(conc.H_(2)SO_(4))rarrA overset(conc.HNO_(3))rarrB` Here A and B ... 4-dinitrophenol D. 3-Hydroxybenzene sulphonic acid, picric acid
Description : Assertion (A): Diethyl ether reacts with hot Conc `H_(2)SO_(4)` and gives ethyl hydrogen sulphate Reason (R): The reaction involves cleavage of C-O bo
Last Answer : Assertion (A): Diethyl ether reacts with hot Conc `H_(2)SO_(4)` and gives ethyl hydrogen sulphate Reason (R ... R is false D. A is false but R is true
Description : Anisole with conc. `HNO_(3)` and conc. `H_(2)SO_(4)` gives
Last Answer : Anisole with conc. `HNO_(3)` and conc. `H_(2)SO_(4)` gives A. Phenol B. Nitrobenzene C. O - and - P - Nitroanisole D. O- Nitroanisole
Description : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling. A with conc. `H_(2)SO_(4)` a colour
Last Answer : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling ... . `C_(2)H_(5)OH` D. `C_(2)H_(6)`
Description : Which of the following alkenes when passed through conc. `H_(2)SO_(4)` followed by hydrolysis with boiling water would give tert-butyl alcohol
Last Answer : Which of the following alkenes when passed through conc. `H_(2)SO_(4)` followed by hydrolysis with ... B. Isobutylene C. Propylene D. But-1-ene
Description : `Ph - underset(OH) underset(|)overset(CH_(3))overset(|)(C) - underset(OH) underset(|)overset(Ph)overset(|)(C) - Ph underset(H_(2)SO_(4))overset("Conc"
Last Answer : `Ph - underset(OH) underset(|)overset(CH_(3))overset(|)(C) - underset(OH) underset(|)overset(Ph)overset(| ... ) - underset(O)underset(||)(C) - CH_(3)`
Last Answer : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling ... . `C_(2)H_(6)` D. `C_(2)H_(5)OH`
Description : Assertion (A): Dehydration of alcohols can be carried out with Conc `H_(2)SO_(4)` but not with conc HCl Reason (R): `H_(2)SO_(4)` is dibasic while HCl
Last Answer : Assertion (A): Dehydration of alcohols can be carried out with Conc `H_(2)SO_(4)` but not with conc HCl ... R is false D. A is false but R is true