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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.
| 51. |
Oxidation number of `P` in `Ba(H_(2)PO_(2))_(2)` isA. `+3`B. `+2`C. `+1`D. `-1` |
| Answer» Correct Answer - B | |
| 52. |
The highest oxidation state of `Mn` is shown byA. `K_(2)MnO_(4)`B. `KMnO_(4)`C. `MnO_(2)`D. `Mn_(2)O_(3)` |
| Answer» Correct Answer - C | |
| 53. |
The oxidation number of `S` in `Na_(2)S_(4)O_(6)` isA. `+0.5`B. 2.5C. `+4`D. `+6` |
| Answer» Correct Answer - D | |
| 54. |
Carbon is in highest oxidation state in:A. `CH_(3)Cl`B. `C Cl_(4)`C. `CHCl_(3)`D. `CH_(2)Cl` |
| Answer» Correct Answer - B | |
| 55. |
When methane is burnt in oxygen to produce `CO_(2) and H_(2)O`. the oxidation number changes by:A. `-8`B. zeroC. `+8`D. `+4` |
| Answer» Correct Answer - C | |
| 56. |
The oxidation number of nitrogen in `NO_(3)^(-)` is:A. `-1`B. `+2`C. `+3`D. `+5` |
| Answer» Correct Answer - B | |
| 57. |
An element that never has a positive oxidation state in any of its compounds isA. boronB. oxygenC. chlorineD. fluorine |
| Answer» Correct Answer - D | |
| 58. |
Which of the following statements is correctA. Oxidation of a substance is followed by reduction of anotherB. Reduction of a substance is followed by oxidation of anotherC. Oxidation and reduction are complementary reactions.D. It is not necessary that both oxidation and reduction should take place in the same reaction |
| Answer» Correct Answer - C | |
| 59. |
Reduction never involves:A. gain of electronsB. decrease in oxidation numberC. loss of electronsD. decrease in valency of electropositive component |
| Answer» Correct Answer - C | |
| 60. |
Oxidation and reduction process involves the transaction of electrons. Loss of electrons is oxidation and the gain of electrons is reduction. It is thus obvious that in a redox reaction, the oxidant is reduced by accepting the electrons and the reductant is oxidised by losing electrons. The reactions in which a species disproportionates into two oxidation states (lower and higher) are called disproportionation reactions. In electrochemical cells, redox reaction is involved, i.e., oxidation takes place at anode and reduction at cathode. Detennine the change in oxidation number of sulphur in `H_(2)S and SO_(2)` respectively in the following reaction: `2H_(2)S+SO_(2) to 2H_(2)O+3S`A. 0,+2B. `+2,-4`C. `-2,+2`D. `+4,0` |
| Answer» Correct Answer - B | |
| 61. |
Oxidation and reduction process involves the transaction of electrons. Loss of electrons is oxidation and the gain of electrons is reduction. It is thus obvious that in a redox reaction, the oxidant is reduced by accepting the electrons and the reductant is oxidised by losing electrons. The reactions in which a species disproportionates into two oxidation states (lower and higher) are called disproportionation reactions. In electrochemical cells, redox reaction is involved, i.e., oxidation takes place at anode and reduction at cathode. In the reaction: `I_(2)+2S_(2)O_(3)^(2-) to 2I^(-)+S_(4)O_(6)^(2-)`A. `I_(2)` is a reducing agentB. `I_(2)` is an oxidising agentC. `S_(2)O_(3)^(2-)` is a reducing agentD. `S_(2)O_(3)^(2-)` is an oxidising agent |
| Answer» Correct Answer - B::C | |
| 62. |
Which of the following reactions is not a redox reaction?A. `Ag^++Cl^(-) to AgCl`B. `Zn(s)+Cu^(2+)(aq.)toZn^(2+)+Cu(s)`C. `2Mg(s)+O_(2)(g)to2MgO`D. `FeO+C to Fe+CO` |
| Answer» Correct Answer - A | |
| 63. |
Pick the group which docs not on an a neutral oxide:A. `NO_(2),P_(4)O_(10),Al_(2)O_(3),NO`B. `MgO,N_(2)O_(3),SO_(3),N_(2)O`C. `CO_(2),SO_(3),CaO,XeO_(3)`D. `CO,SiO_(2),SnO_(2),Na_(2)O_(3)` |
| Answer» Correct Answer - C | |
| 64. |
The reaction of `H_(2)S+H_(2)O_(2) rarr S+2H_(2)O` manifestsA. oxidising action of `H_(2)O_(2)`B. reducing nature of `H_(2)O_(2)`C. acidic nature `H_(2)O_(2)`D. alkaline nature of `H_(2)O_(2)` |
| Answer» Correct Answer - A | |
| 65. |
Which of the following is not a redox reaction?A. Burning of candleB. Rusting of ironC. Dissolving a salt in waterD. Disssolving Zn in dil. `H_(2)SO_(4)` |
| Answer» Correct Answer - C | |
| 66. |
The oxidant which cannot act as a reducing agent isA. `CO_(2)`B. `NO_(2)`C. `SO_(2)`D. `ClO_(2)` |
| Answer» Correct Answer - A | |
| 67. |
The oxidation number of xenon in `XeOF_(2)` isA. zeroB. 2C. 4D. 3 |
| Answer» Correct Answer - C | |
| 68. |
Oxidation and reduction process involves the transaction of electrons. Loss of electrons is oxidation and the gain of electrons is reduction. It is thus obvious that in a redox reaction, the oxidant is reduced by accepting the electrons and the reductant is oxidised by losing electrons. The reactions in which a species disproportionates into two oxidation states (lower and higher) are called disproportionation reactions. In electrochemical cells, redox reaction is involved, i.e., oxidation takes place at anode and reduction at cathode. Select the correct statement:A. oxidation takes place at anode in electrochemical cellB. reduction take place at anode in electrolytic cellC. oxidation takes place at anode n electrolytic cellD. all are correct |
| Answer» Correct Answer - A::B | |
| 69. |
In a reaction `H_(2)O("steam")+C("glowing")=CO+H_(2)`A. `H_(2)O` Is the reducing agentB. `H_(2)O` is the oxidising agentC. carbon is the oxidising agentD. oxidation reduction does no occur |
| Answer» Correct Answer - B | |
| 70. |
Oxygen has an oxidation state of +2 inA. `H_(2)O_(2)`B. `OF_(2)`C. `SO_(2)`D. `H_(2)O` |
| Answer» Correct Answer - A | |
| 71. |
Addition of iron or zinc to copper sulphate cause, precipitation of copper owing to the:A. reduction of `Cu^(2+)`B. oxidation of `Cu^(2+)`C. hydrolysis of `CuSO_(4)`D. ionisationn of `CuSO_(4)` |
| Answer» Correct Answer - A | |
| 72. |
When iron is rusted, it isA. oxidisedB. reducedC. evaporatedD. decomposed |
| Answer» Correct Answer - D | |
| 73. |
`6xx10^(-3)` mole `K_(2)Cr_(2) C_(7)` reacts completely with `9xx10^(-3)` mole `X^(n+)` to give `XO_(3)^(-)` and `Cr^(3+)`. The value of `n` is `:`A. 1B. 2C. 3D. 5 |
| Answer» Correct Answer - A | |
| 74. |
Select the compound in which chlorine shows oxidation state +7:A. `HClO_(4)`B. `HCIO_(3)`C. `HCIO_(3)`D. `HCIO` |
| Answer» Correct Answer - A | |
| 75. |
Assertion (A): `SO_(2)` and `Cl_(2)` are both bleaching agents. Reason (R ): Both are reducing agents.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 - C | |
| 76. |
The oxidation number of chlorine in HOCI is:A. `-1`B. zeroC. `+1`D. `+2` |
| Answer» Correct Answer - C | |
| 77. |
Oxidation state(s) of chlorine in `CaOCl_(2)` (bleaching powder)A. `+1 and -1`B. `1+only`C. `-1` onlyD. None of these |
| Answer» Correct Answer - A | |
| 78. |
In which one of the following reactions, hydrogen is acts as an oxidising agent ?A. With iodine to give hydrogen iodideB. With lithium to give lithium hydrideC. With nitrogen to give ammoniaD. With sulphur to give hydrogen sulphide |
| Answer» Correct Answer - A | |
| 79. |
(A) Identification of cathode and anode is done with the help of thermometer. (R ) Higher is the value of reduction potential. greater would be its reducing power.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 - D | |
| 80. |
Assertion (A) In the reaction between potassium permanganate and potassium iodide, permanganate ions acts as oxidising agent. Reason ( R) Oxidation state of manganese changes from +2 and +7 during the reaction.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 - C | |
| 81. |
In which of the following coordmation compounds do the transition metals have an oxidation number of +6?A. `[Cr(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O `B. `[Fe(CO)_(5)]`C. `[(H_(2)O)_(5)Cr-O-Cr(H_(2)O)_(5)]^(4+)`D. `K_(2)[Cr(CN)_(2)O_(2)(O_(2))NH_(3)]` |
| Answer» Correct Answer - D | |
| 82. |
The missing tenn in the following equation is: `2Fe^(3+)+Sn^(2+) to 2Fe^(2+)+...`A. `Sn^(4+)`B. `Sn^(3+)`C. `Sn^(2+)`D. `Sn^(+)` |
| Answer» Correct Answer - C | |
| 83. |
Which among the following compounds have +6 state with the metal atoms?A. `[Fe(CN)_(6)]^(4-)`B. `[Fe(CN)_(6)]^(3-)`C. `[Cr(CN)_(6)]^(3-)`D. `CrO_(2)Cl_(2)` |
| Answer» Correct Answer - D | |
| 84. |
In the ethylene molecule the two carbon atoms have the oxidation numbers:A. `-1,-1`B. `-2,-2`C. `-1,-2`D. `+2,-2` |
| Answer» Correct Answer - B | |
| 85. |
A compound contains atoms A, B and C. the oxidation number of A is `+2`, of B is `+5` and of C is `-2`. The possible formula of the compound isA. `ABC_(2)`B. `B_(2)(AC_(3))_(2)`C. `A_(3)(BC_(4))_(2)`D. `A_(3)(B_(4)C)_(2)` |
| Answer» Correct Answer - D | |
| 86. |
Why the following reaction is not possible?A. Both `Cr_(2)O_(7)^(2-) and Fe^(3+)` are reducing agentsB. Both `Cr_(2)O_(7)^(2-) and Fe^(3+)` are oxidising agentsC. `Cr_(2)O_(7)^(2-)` is a strong oxidsing agent while `Fe^(3+)` is a weak oxidising agent.D. The solution is acidic in nature |
| Answer» Correct Answer - B | |
| 87. |
Which one of the following statements is not correct?A. Oxidation number of S in `(NH_(4))_(2)S_(2)O_(8)` is +6B. Oxidation number of Os in `OsO_(4)` is +8C. Oxidation number of S in `H_(2)SO_(5)` is +8D. Oxidation number of O in `KO_(2)"is" -(1)/(2)` |
| Answer» Correct Answer - C | |
| 88. |
Which of the following groups of molecules act both as oxidising agent as well as reducing agent?A. `KMnO_(4).O_(3),SO_(3)`B. `HClO_(4),HNO_(2),H_(2)O_(2)`C. `HNO_(2),SO_(2),H_(2)O_(2)`D. `HNO_(2),SO_(2),H_(2)SO_(4)` |
| Answer» Correct Answer - C | |
| 89. |
The oxidant which cannot act as a reducing agent isA. `SO_(2)`B. `NO_(2)`C. `CO_(2)`D. `ClO_(2)` |
| Answer» Correct Answer - C | |
| 90. |
Which of the following is not a reducing agent ?A. `SO_(2)`B. `H_(2)O_(2)`C. `CO_(2)`D. `NO_(2)` |
| Answer» Correct Answer - C | |
| 91. |
Which of the following molecules can act as an oxidating as well as a reducing agent?A. `H_(2)S`B. `SO_(3)`C. `H_(2)O_(2)`D. `F_(2)` |
| Answer» Correct Answer - C | |
| 92. |
The reaction, `2H_(2)O(l) to 4H^(+)(aq.)+O_(2)(g)+4^(-)` isA. a redox reactionB. a hydrolysis reactionC. a solvolysis reactionD. an oscillatory reaction |
| Answer» Correct Answer - A | |
| 93. |
The reaction of `H_(2)S+H_(2)O_(2) rarr S+2H_(2)O` manifestsA. acidic nature of `H_(2)O_(2)`B. reducing agent of `H_(2)O_(2)`C. oxidising action of `H_(2)O_(2)`D. alkaline nature of `H_(2)O_(2)` |
| Answer» Correct Answer - C | |