InterviewSolution
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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. |
In the following reaction `3Br_(2)+6CO_(3)^(2-)+3H_(2)O=5Br^(-)+BrO_(3)^(-)+6HCO_(3)^(-)`A. bromine is oxidised carbonate is reduced,B. bromine is reduced, carbonate is oxidisedC. bromine in neither reduced nor oxidisedD. bromine is reduced as well as oxidised |
| Answer» Correct Answer - D | |
| 2. |
Valency and Oxidation number are different for an element. Valency of carbon is generally 4, however, the oxidation state may be `-4,-2 0,+2,-1` etc. In the compounds containing carbon. hydrogen and oxygen the oxidation number of carbon can be calculated as `"Oxidation number of carbon"=(2n_(O)-n_(H))/(n_(C)` Where, `n_(H), n_(O) and n_(C)` are number of respective atoms Which of the following oxides of carbon has fractional oxidation state?A. Carbon monoxideB. Carbon dioxideC. Carbon suboxideD. All of these |
| Answer» Correct Answer - C | |
| 3. |
Valency and Oxidation number are different for an element. Valency of carbon is generally 4, however, the oxidation state may be `-4,-2 0,+2,-1` etc. In the compounds containing carbon. hydrogen and oxygen the oxidation number of carbon can be calculated as `"Oxidation number of carbon"=(2n_(O)-n_(H))/(n_(C)` Where, `n_(H), n_(O) and n_(C)` are number of respective atoms Which of the following compounds have zero oxidation state at carbonA. `C_(6)H_(12)O_(6)`B. `HCOOH`C. HCHOD. `CH_(4)` |
| Answer» Correct Answer - A::C | |
| 4. |
The valancy of carbons is generally `4`, but its oxidation state may be `-4, -2, 0, +2, -1`, etc. In the compounds containing `C, H`, and `O`, the oxidation number of `C` is calculated as Oxidation number of `C= (2n_(O)-n_(H))/(n_(C ))` Where `n_(O), n_(H)` and `n_(C )` are the numbers of oxygen, hydrogen, and carbons, atoms, respectively. In which of the following compounds is the oxidation state of carbon is zero?A. `CH_(4)`B. `CH_(3)OH`C. `CH_(2)O`D. HCOOH |
| Answer» Correct Answer - D | |
| 5. |
In which of the following pairs. the oxidation states, of sulphuric and chromium are same?A. `SO_(3)^(2-),CrO_(4)^(2-)`B. `SO_(3),CrO_(4)^(2-)`C. `SO_(2),CrO_(4)^(2-)`D. `SO_(2),Cr_(2)O_(7)^(2-)` |
| Answer» Correct Answer - C | |
| 6. |
Valency and Oxidation number are different for an element. Valency of carbon is generally 4, however, the oxidation state may be `-4,-2 0,+2,-1` etc. In the compounds containing carbon. hydrogen and oxygen the oxidation number of carbon can be calculated as `"Oxidation number of carbon"=(2n_(O)-n_(H))/(n_(C)` Where, `n_(H), n_(O) and n_(C)` are number of respective atoms In which of the following compounds, the valency of carbon is two?A. CarbenesB. AllenesC. AlkenesD. Ketenes |
| Answer» Correct Answer - A | |
| 7. |
The oxidation state of chromium in chromoium trioxide is:A. `+3`B. `+4`C. `+5`D. `+6` |
| Answer» Correct Answer - D | |
| 8. |
In that compounds `KMnO_(4) and K_(2)Cr_(2)O_(7)` the highest oxidation state the element:A. potassiumB. chromiumC. oxygenD. maganse |
| Answer» Correct Answer - D | |
| 9. |
Nitrogen forms a variety of compounds in all oxidation states ranging from:A. `-3 "to"+5`B. `-3 "to"+3`C. `-3 "to"+4`D. `-3 "to"+6` |
| Answer» Correct Answer - A | |
| 10. |
When `SO_(2)` is passed through acidic solution of potassium dichromate, then chromium sulphate is formed. Change in valency of chronium isA. `+4 "to" +2`B. `+6"to"+3`C. `+7"to"+2`D. `+5"to"+3` |
| Answer» Correct Answer - B | |
| 11. |
Oxidation number of fluorine in `F_(2)O` is:A. `+1`B. `+2`C. `-1`D. `-2` |
| Answer» Correct Answer - C | |
| 12. |
Oxidation states of iodine vary fromA. `-1 "to" +1`B. `-1"to"+7`C. `+3"to"+5`D. `-1"to"+5` |
| Answer» Correct Answer - B | |
| 13. |
The oxidation state of iodine in `H_(4)IO_(6)^(-)` is:A. `+7`B. `-1`C. `+5`D. `+1` |
| Answer» Correct Answer - C | |
| 14. |
Oxidation number if iodine in `IO_(3)^(-), IO_(4)^(-),KI and I_(2)` respectively areA. `-1,-1,0,+1`B. `+3,+5,+7,0`C. `+5,+7,-1,0`D. `-1,-5,-1,0` |
| Answer» Correct Answer - C | |
| 15. |
The equivalent weight of `FeC_(2)O_(4)` in the change `FeC_(2)O_(4)rarrFe^(3+)+CO_(2)` isA. M/3B. M/6C. M/2D. M/1 |
| Answer» Correct Answer - D | |
| 16. |
In which of the following pairs both members contain peroxy linkage?A. `H_(2)S_(2)O_(8), H_(4)P_(2)O_(6)`B. `H_(2)SO_(5), H_(4)P_(2)O_(7)`C. `H_(2)TiO_(4), H_(4)P_(2)O_(8)`D. `S_(3)O_(9), P_(2)O_(7)` |
| Answer» Correct Answer - C | |
| 17. |
Statement-1:Spector ions are the species that are present in the solution but do not part in the reaction Because ltbr Statement-2: The phenomena of formation of `H_(2)O_(2)` by the oxidation of `H_(2)O` is known as auto-oxdationA. `PbO_(2)`B. `H_(2)O_(2)`C. `SrO_(2)`D. `BaO_(2)` |
| Answer» Correct Answer - B::C::D | |
| 18. |
The species that contain peroxide ions are:A. KIB. `KI_(3)`C. `I_(2)`D. `H_(2)O_(2)` |
| Answer» Correct Answer - B::C::D | |
| 19. |
In `[Cr(O_(2))(NH_(3))_(4)H_(2)O]Cl_(2)` oxidation number of Cr is +3 then oxygen will be the form:A. dioxoB. peroxoC. superoxoD. oxo |
| Answer» Correct Answer - C | |
| 20. |
Following reaction describes the rusting of iron `4Fe+3O_(2) rarr 4Fe^(3+)+6O^(2-)` Which one of the following statements is incorrect?A. It s redox reactionB. Metallic iron is a reducing agentC. `Fe^(3+)` is an oxidising agentD. Metallic iron is reduced to `Fe^(2+)` |
| Answer» Correct Answer - A | |
| 21. |
A reducing agent is a substance Which can:A. accept electronsB. donate electronsC. accept protonsD. donate protons |
| Answer» Correct Answer - B | |
| 22. |
In the reaction, `CrO_(5)+SnCl_(2) to CrO_(4)^(2-) +SnCl_(4)`,the element undergoing oxidation and reduction respectively, are:A. Cr,SnB. Sn,CrC. Sn,OD. Cl,C |
| Answer» Correct Answer - C | |
| 23. |
Among these, identify the species with an atom in `+6` oxidation state: .A. `MnO_(4)^(-)`B. `Cr(CN)_(6)^(2-)`C. `NiF_(6)^(2-)`D. `CrO_(2)Cl_(2)` |
| Answer» Correct Answer - D | |
| 24. |
In which of the following compounds, iron has an oxidation state of+3?A. `Fe(NO_(3))_(2)`B. `FeC_(2)O_(4)`C. `[Fe(H_(2)O)_(6)]Cl`D. `(NH_(4))_(2)SO_(4).FeSO_(4).6H_(2)O` |
| Answer» Correct Answer - C | |
| 25. |
In which of the following reactions the underlined substance is oxidised?A. `3Mg+underline N_(2) to Mg_(3)N_(2)`B. `2KI+underline Br_(2) to 2KBr+I_(2)`C. `underline CuO+H_(2) to Cu+H_(2)O`D. `underline CO+Cl_(2) to COCl_(2)` |
| Answer» Correct Answer - D | |
| 26. |
Equivalent mass of `KMnO_(4)` in acidic basic and netural are in the ratio, of:A. `3:5:15`B. `5:3:1`C. `5:1:3`D. `3:15:5` |
| Answer» Correct Answer - D | |
| 27. |
On reduction of `KMnO_(4)` by oxalic acid in acidic medium, the oxidation number of Mn. What is the magnitude of is change?A. 7 to 2B. 6 to 2C. 5 to 2D. 7 to 4 |
| Answer» Correct Answer - A | |
| 28. |
When `KMnO_(4)` is reduced with oxalic acid in acidic solution, the oxidation number of `Mn` changes fromA. 7 to 2B. 7 to 4C. 7 to 6D. 6 to 2 |
| Answer» Correct Answer - A | |
| 29. |
Assertion (A): `PbCl_(2)` is more stable than `PbCl_(4)`. Reason (R ): `PbCl_(4)` is a powerful oxidising agent.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).C. If(A) is correct, but (R) is incorrect.D. lf(A) is incorrect, but (R) is correct. |
| Answer» Correct Answer - B | |
| 30. |
Which of the following chemical reactions depicts the oxidising behaviour of `H_(2)SO_(4)`?A. `2HI+H_(2)SO_(4) to I_(2)+SO_(2)+2H_(2)O`B. `Ca(OH)_(2)+H_(2)SO_(4) to NaHSO_(4)+HCl`C. `NaCl+H_(2)SO_(4) to NaHSO_(4)+HCl`D. `2PCl_(5)+H_(2)SO_(4) to 2POCl_(3)+2HCl+SO_(2)Cl_(2)` |
| Answer» Correct Answer - A | |
| 31. |
In the reaction `8Al+3Fe_(3)O_(4)rarr 4Al_(2)O_(3)+9Fe` the number of electrons transferred from the reductant to the oxidant isA. 8B. 4C. 16D. 24 |
| Answer» Correct Answer - D | |
| 32. |
The oxidation number of `Fe` in `Fe_(0.94)O` isA. 200B. 200/94C. 94/200D. None of these |
| Answer» Correct Answer - B | |
| 33. |
which of the following is a redox reaction ?A. `NaCl+KNO_(3) to NaNO_(3)+KCl`B. `CaC_(2)O_(4)+2HCl to CaCl_(2)+H_(2)C_(2)O_(4)`C. `CaC_(2)O_(4)+2HCl to CaCl_(2)+H_(2)C_(2)O_(4)`D. `Zn+2AgCN to 2Ag+Zn(CN)_(2)` |
| Answer» Correct Answer - C | |
| 34. |
For decolourisation of `1 "mol of" KMnO_(4)`, the moles of `H_(2)O_(2)` required isA. `(1)/(2)`B. `(3)/(2)`C. `(5)/(2)`D. `(7)/(2)` |
| Answer» Correct Answer - C | |
| 35. |
Which of the following is not a disproportionation reaction ?A. B. C. `NaH+H_(2)0 to NaOH+H_(2)`D. All of these |
| Answer» Correct Answer - A | |
| 36. |
Which of the following species does not show disproportionation reaction?A. `ClO^(-)`B. `ClO_(2)^(-)`C. `ClO_(3)^(-)`D. `ClO_(4)^(-)` |
| Answer» Correct Answer - D | |
| 37. |
Which of the following is a disproportionation reaction?A. `Cu_(2)O+2H^(+) to Cu+Cu^(2+)+H_(2)O`B. `2CrO_(4)^(2-)+2H^(+) to Cr_(2)O_(7)^(2-)+H_(2)O`C. `CaCO_(3)+2H^(+) to Ca^(2+)+H_(2)O+CO_(2)`D. `Cr_(2)O_(7)^(2-)+2OH^(-) to 2CrO_(4)^(2-)+H_(2)O` |
| Answer» Correct Answer - A | |
| 38. |
Which of the following arc disproportionation reactions? (A) `2NO_(2)(g)+2NaOH(aq.) to NaNO_(2)(aq.)+NaNO_(3)(aq.)+H_(2)O(l)` (B). `Cl_(2)(g)_2NaOH(aq.) to NaOCl(aq.)+NaCl(aq.)+H_(2)O(l)` (C ).`3ClO^(-) to 2Cl^(-)+ClO_(3)^(-)` (D). `3Mg(s)+N_(2)(g) to NaOCl(aq.)+NaCl(aq.)+H_(2)O(l)`A. A,B,DB. B,C,DC. B,CD. A,B,C |
| Answer» Correct Answer - D | |
| 39. |
Phosphorus has the oxidation state `+3` inA. ortho phosphoric acidB. phosphorus acidC. meta phosphoric acidD. pyrophophoric acid |
| Answer» Correct Answer - B | |
| 40. |
The oxidation number of phosphorus in `PO_(4)^(3-), P_(4)O_(10)`, and `P_(2)O_(7)^(4-)` isA. `+5`B. `+3`C. `-3`D. `+2` |
| Answer» Correct Answer - B | |
| 41. |
Redox reactions are of three types: (i) Intermolernlar redox reactions. (ii) lntramolecular redox reactions, (iii) Auto redox reactions OR Disproportionation reactions. Redox reactions are divided into two main types: (i) Chemical redox reactions, (ii) Electrochemical redox reactions which either produce or consume electricity Oxidation and reduction process takes place in a reaction simultaneously. Which of the following is a redox reaction?A. `NaCl+KNO_(3) to NaNO_(3)+KCl`B. `CaC_(2)O_(4)+2HCl to CaCl_(2)+H_(2)C_(2)O_(4)`C. `Mg(OH)_(2)+2NH_(4)Cl to MgCl_(2)+2NH_(4)OH`D. `Zn+2AgCN to 2Ag+Zn(CN)_(2)` |
| Answer» Correct Answer - D | |
| 42. |
Which among the following are auto redox reactions?A. `P_(4)+OH^(-) to H_(2)PO_(4)^(-)+PH_(3)`B. `S_(2)O_(3)^(2-) to SO_(4)^(2-)+S`C. `H_(2)O_(2) to H_(2)O+O_(2)`D. `AgCl+NH_(3)to [Ag(NH_(3))_(2)]Cl` |
| Answer» Correct Answer - A::B::C | |
| 43. |
Redox reactions are of three types: (i) Intermolernlar redox reactions. (ii) lntramolecular redox reactions, (iii) Auto redox reactions OR Disproportionation reactions. Redox reactions are divided into two main types: (i) Chemical redox reactions, (ii) Electrochemical redox reactions which either produce or consume electricity Oxidation and reduction process takes place in a reaction simultaneously. Select the intramolccular redox reaction(s) among the following:A. `2KClO_(3) to 2KCl +3O_(2)`B. `(NH_(4))_(2)Cr_(2)O_(7) to N_(2)+Cr_(2)O_(3)+4H_(2)O`C. `Cl_(2) to Cl^(-)+ClO_(3)^(-)`D. `NH_(4)NO_(2) to N_(2)+2H_(2)O` |
| Answer» Correct Answer - A::B::D | |
| 44. |
Redox reactions are of three types: (i) Intermolernlar redox reactions. (ii) lntramolecular redox reactions, (iii) Auto redox reactions OR Disproportionation reactions. Redox reactions are divided into two main types: (i) Chemical redox reactions, (ii) Electrochemical redox reactions which either produce or consume electricity Oxidation and reduction process takes place in a reaction simultaneously. In which of the following reactions, `H_(2)O_(2)`, acts as reducing?A. `Cl_(2)+H_(2)O_(2) to 2HCl+O_(2)`B. `H_(2)O_(2)+ O_(3) to H_(2)O+2O_(2)`C. `HCHO+H_(2)O_(2) to HCOOH+H_(2)O`D. `PbO_(2)+H_(2)O_(2) to PbO+H_(2)O+O_(2)` |
| Answer» Correct Answer - A::B::D | |
| 45. |
Redox reactions are of three types: (i) Intermolernlar redox reactions. (ii) lntramolecular redox reactions, (iii) Auto redox reactions OR Disproportionation reactions. Redox reactions are divided into two main types: (i) Chemical redox reactions, (ii) Electrochemical redox reactions which either produce or consume electricity Oxidation and reduction process takes place in a reaction simultaneously. Which among the following acts as oxidising as well as reducing agent?A. `HNO_(2)`B. `HNO_(3)`C. `H_(2)SO_(4)`D. `KMnO_(4)` |
| Answer» Correct Answer - A | |
| 46. |
Redox reactions are of three types: (i) Intermolernlar redox reactions. (ii) lntramolecular redox reactions, (iii) Auto redox reactions OR Disproportionation reactions. Redox reactions are divided into two main types: (i) Chemical redox reactions, (ii) Electrochemical redox reactions which either produce or consume electricity Oxidation and reduction process takes place in a reaction simultaneously. The value of x in the following reaction, `MnO_(4)+8H^(+)+xe to Mn^(2+)+4H_(2)O ` isA. 5B. 10C. 2D. 3 |
| Answer» Correct Answer - A | |
| 47. |
In a redox reaction: `xCH_(3)CH_(2)OH+yI_(2)+zOH^(-) to CHO_(3)+HCO_(2)^(-)+I^(-)+H_(2)O`A. x=1,y=4,z=6B. x=1,y=6,z=4C. x=1,y=8,z=12D. x=1,y=8,z=8 |
| Answer» Correct Answer - A | |
| 48. |
In the redox reaction, `x KMnO_(4) + NH_(3) rarr y KNO_(3) + MnO_(2) + MnO_(2) + KOH + H_(2)O`, x and y areA. x=4,y=6B. x=8,y=3C. x=8,y=6D. x=3,y=8 |
| Answer» Correct Answer - B | |
| 49. |
How many mole of electrons are involved in the reduction of one mole of `MnO_(4)^(-)` ion in alkaline medium to `MnO_(3)^(-)`A. 2B. 1C. 3D. 4 |
| Answer» Correct Answer - A | |
| 50. |
(A) `HClO_(4)` is stronger acid than `HClO_(3)`. (R ) Oxidation state of Cl in `HClO_(4)` is +VII and in `HClO_(3)`, it is+V.A. If both (A) and (R ) are true. and (R ) is the correct explanation of (A).B. If both (A) und (R ) are true, but (R ) is not the correct explanation of (A).C. lf (A) and (R ) is false.D. lf (A) and (R )are both false. |
| Answer» Correct Answer - B | |