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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. |
Crown shape of `S_(8)` molecule is present inA. Rhombic sulphurB. Monoclinic sulphurC. Both 1 & 2D. None of these |
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Answer» Correct Answer - C Both rhombic & monoclinic sulphur has crown shape |
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| 52. |
Match the reaction listed in coloumn -I with characteristic (s)/type of reactions listed in coloumn II |
| Answer» Correct Answer - `(A -p,q,s); (B-p,q,r,s); (C-q,r,s); (D-p,q,r,s)` | |
| 53. |
The true statement for the acids of phosphorus `H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4)` isA. the order of their reducing strength is `H_(3)PO_(2) gt H_(3)PO_(3) gt H_(3)PO_(4)`B. the hybridisation of phosphorus is `sp^(2)` in all theseC. The acidic strength order is `H_(3)PO_(2) gt H_(3)PO_(3) gt H_(3)PO_(4)`D. All of these |
| Answer» Correct Answer - A | |
| 54. |
The true statement for the acids of phosphorus. `H_(3)PO_(2) ,H_(3)PO_(3)` and `H_(3)PO_(4)` is:A. `H_(3)PO_(3)` on heating does not disproportionateB. all of them are reducing in natureC. all of them are tribasic acidsD. `H_(3)PO_(2)` is obtained by alkaline hydrolysis of `P_(4)` (white) |
| Answer» Correct Answer - D | |
| 55. |
How many of the following properties increase down the group for nitrogen family (a) Atomic size (b) Acidic character of oxides (c) Boiling point of hydrides (d) Reducing power of hydrides (e) Extent of `p pi - p pi` overlap (f) Metallic character (g) Basic character of hydrides |
| Answer» Correct Answer - `(a,b,c,e,f)` | |
| 56. |
The basic strength of the hydrides of group 15 elements :A. decreases on moving down the groupB. increases on moving down the groupC. first decrease upto `AsH_(3)` and then increasesD. first increases upto `AsH_(3)` and then decreases |
| Answer» Correct Answer - A | |
| 57. |
The number of P-O-P bonds in cyclic trimetaphosphoric acid is :A. zeroB. twoC. threeD. four |
| Answer» Correct Answer - C | |
| 58. |
Ozone is obtained from oxygenA. By oxidation at high temperatureB. By oxidation using a catalystC. By silent electric dischargeD. By conversion at high pressure |
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Answer» Correct Answer - C `3O_(2) underset("discharge")overset("electric")hArr 2O_(3)` |
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| 59. |
Number of acidic oxides among the following is: (a) `N_(2)O` (b) `NO` (c) `N_(2)O_(3)` (d) `N_(2)O_(4)` (e) `N_(2)O_(5)` (f) `P_(4)O_(6)` (g) `P_(4)O_(10)` (h) `SO_(3)` (i) `B_(2)O_(3)` (j) `CO` |
| Answer» Correct Answer - 7 | |
| 60. |
Match the oxy-acids of phosphorus listed in column-I with type of bond (s) listed in column -II |
| Answer» Correct Answer - `(A-q,s) ; (B-q,r); (C-q,s) ; (D-q)` | |
| 61. |
The correct order of acidic strength isA. `Cl_(2)O_(7) gt SO_(2) gt P_(4)O_(10)`B. `CO_(2) gt N_(2)O_(5) gt SO_(3)`C. `Na_(2)O gt MgO gt Al_(2)O_(3)`D. `K_(2)O gt CaO gt MgO` |
| Answer» Correct Answer - A | |
| 62. |
Which of the following oxides is the most acidic?A. `N_(2)O_(5)`B. `P_(2)O_(5)`C. `As_(2)O_(5)`D. `Ab_(2)O_(5)` |
| Answer» Correct Answer - A | |
| 63. |
The ozone hole in the upper atmosphere of the earth is due to the breakdown of ozone to oxygen. The reaction is catalyzed byA. chlorofluorocarbonsB. oxygen generated during the reactionC. carbon dioxide present in the atmosphereD. chlorine formed by the decomposition of chlorofluorocarbons |
| Answer» Correct Answer - D | |
| 64. |
The electron -pair geometry of the central oxygen atom of ozone isA. linearB. trigonal planarC. tetrahdralD. trigonal bipyramidal |
| Answer» Correct Answer - B | |
| 65. |
Number of gaseous oxides among the following at room temperature is: (a) `N_(2)O` (b) `NO` (c) `N_(2)O_(3)` (d) `NO_(2)` (e) `N_(2)O_(5)` (f) `P_(4)O_(6)` (g) `P_(4)O_(10)` (h) `SO_(2)` (i) `SO_(3)` |
| Answer» Correct Answer - 4(a,b,d and h) | |
| 66. |
What happens ? (a)When phosphine is heated at `150^(@)C`. (b)When phosphine is dissolved in water in presence of light. |
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Answer» (a) Phosphine on heating at `150^(@)C` burns forming `H_(3)PO_(4) " " PH_(3) + 2O_(2) rarr H_(3)PO_(4)` (b) The solution of `PH_(3)` in water decomposes in presence of light giving red phosphorus and `H_(2)` |
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| 67. |
Ammonia can be dried by `:`A. conc. `H_(2)SO_(4)`B. `P_(4)O_(10)`C. `CaO`D. anhydrous `CaCl_(2)` |
| Answer» Correct Answer - C | |
| 68. |
When `P_(4)O_(10)` is dissolved in water, the acid formed finally is :A. `H_(3)PO_(2)`B. `H_(3)PO_(4)`C. `H_(3)PO_(3)`D. `H_(4)P_(2)O_(7)` |
| Answer» Correct Answer - B | |
| 69. |
The correct order of decreasing acidic strength of oxy acids of group 15 elements :A. `HNO_(3) gt H_(3)SbO_(4) gt H_(3)AsO_(4) gt H_(3)PO_(4)`B. `H_(3)PO_(4) gt H_(3)AsO_(4) gt H_(3)SbO_(4) gt HNO_(3)`C. `HNO_(3) gt H_(3)PO_(4) gt H_(3)AsO_(4) gt H_(3)SbO_(4)`D. `HNO_(3) gt H_(3)AsO_(4) gt H_(3) PO_(4) gt H_(3) SbO_(4)` |
| Answer» Correct Answer - C | |
| 70. |
Ozone layer is being depleted. This is due to :A. NO emission from supersonic jetsB. chloroflurocarbon used as aerosolsC. both A and BD. none of the above |
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Answer» (A) `O_(3) + NO rarr NO_(2) + O_(2)` (B) `{:(Cl_(2) CF_(2) rarr .^(*)(Cl) + .^(*)C CIF_(2) ,,,.^(*)Cl + O_(3) rarr ClO^(*) + O_(2)),(ClO^(*) rarr Cl^(*) + O^(*),,,ClO^(*) + O^(*) rarr .^(*)Cl + O_(2)):}` |
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| 71. |
Give the important applications of `O_(3)` |
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Answer» (A) As a germicide and disinfectant for sterilising water improving the atmosphere of crowded places. (B) for detecting the position of double bond in the unsaturated organic compoiunds. (C) In mfg. of artificial silk, synthetic camphor, `KMnO_(4)` etc. It is also used for bleaching oil, ivory, flour starch etc. |
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| 72. |
`NO_(2)` can not be dried by an alkali, why ? |
| Answer» `NO_(2)` being acidic in nature is absorbed by alkali | |
| 73. |
Which of the following is the most powerful oxidising agent:A. `H_(2)SO_(4)`B. `HPO_(3)`C. `H_(3)BO_(3)`D. `H_(3)PO_(4)` |
| Answer» Correct Answer - A | |
| 74. |
Which of the following can convert acidified `Cr_(2)O_(7)^(2-)` to green ?A. `SO_(2)//H_(2)SO_(3)//H_(2)SO_(4)`B. `SO_(3)//H_(2)SO_(3)//H_(2)S`C. `SO_(3)^(2-)//H_(2)S//Fe^(2+)`D. `S(2)O_(3)^(2-)//SO_(3)//Fe^(3+)` |
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Answer» Correct Answer - C Reducing agents can reduce `Cr_(2)O_(7)^(2-) " to " Cr^(3+)` (green solution) |
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| 75. |
`O_(3)` is a powerful oxidising agent. Write equation to represent oxidation of (a)`I^(-)` to `I_(2)` in acidic solution, (b)sulphur to sulphuric acid in the presence of moisture, |
| Answer» (a) `O_(3) + 2I^(-) + 2H^(+) rarr O_(2) + I_(2) + H_(2)O` (b) `3O_(3) + S + H_(2)O rarr H_(2)SO_(4) + 3O_(2)` | |
| 76. |
Which of the following is not formed when `H_(2)S` reacts acidic `K_(2)Cr_(2)O_(7)` solution ?A. `CrSO_(4)`B. `Cr_(2)(SO_(4))_(3)`C. `K_(2)SO_(4)`D. `S` |
| Answer» Correct Answer - A | |
| 77. |
Which of these statements is not true ?A. `NO^(+)` is not isoelectronic with `O_(2)`B. B is always covalent in its compoundsC. In aqueous solution, the `TI^(+)` ions is much more stable than T(III)D. `LiAIH_(4)` is a versatile reducing agent in organic synthesis |
| Answer» Correct Answer - A | |
| 78. |
In the following reaction explain which one is oxidising agent and which one is reducing agent ? `H_(2)O_(2) + O_(3) rarr 2 O_(2) + H_(2)O` |
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Answer» Ozone is behaving as an oxidising agent and `H_(2)O_(2)` is behaving as reducing agent. `2e^(-) + 2H^(+) + O_(2) rarr O_(2) + 2H_(2)O` `H_(2)O_(2) rarr O_(2) + 2H^(+) + 2e^(-)` The above interpretations is further supported on the following grounds. SRP of `H_(2)O_(2) " is " + 1.77V` while SRP of `O_(3) " is " + 2.07V`. Therefore, `O_(3)` is stronger oxidising agent than `H_(2)O_(2)` |
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| 79. |
Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases `H_(2)O_(2)` acts as a reducing agent in acid medium ?A. `MnO_(4)^(-)`B. `Cr_(2)O_(7)^(2-)`C. `SO_(3)^(2-)`D. `KI` |
| Answer» Correct Answer - A | |
| 80. |
Upon heating`KClO_(3)` in presence of catalytic amount of `MnO_(2)`, a gas `W` is formed. Excess amount of `W` reacts with white phosphorus to given `X`. The reaction of `X` with pure `HNO_(3)` gives `Y` and `Z`. Y and Z are, respectivelyA. `N_(2)O_(4) and PHO_(3)`B. `N_(2)O_(4) and H_(3)PO_(3)`C. `N_(2)O_(3) and H_(3)PO_(4)`D. `N_(2)O_(5) and HPO_(3)` |
| Answer» Correct Answer - D | |
| 81. |
Ammonia reacts with red -hot cupric oxide to produceA. `Cu_(2)O, N_(2), H_(2)`B. `Cu, H_(2)O, N_(2)`C. `Cu(OH)_(2), N_(2)`D. `[Cu(NH_(3))_(4)] (OH)_(2)` |
| Answer» Correct Answer - B | |
| 82. |
Identify the incorrect statement :A. Rhombic and monoclinic sulphur have `S_(8)` moleculesB. `S_(8)` ring has a crown shapeC. `S_(2)` is paramagnetic like oxygenD. The `S - S - S` bond angle in the `S_(8) and S_(6)` rings are the same |
| Answer» Correct Answer - D | |
| 83. |
The non-metal that does not exhibit posittve oxidation state is:A. FluorineB. OxygenC. ChorineD. Iodine |
| Answer» Correct Answer - A | |
| 84. |
Match each of the reaction given in Column I with the corresponding product(s) given in Column II. `{:("Column I","Column II"),(A. "Cu+dil. HNO"_(3),p."NO"),(B."Cu+cons. HNO"_(3),q. "NO"_(2)),(C. "Zn+dil.HNO"_(3),r. "N"_(2)"O"),(D. "Zn+cons HNO"_(3),s. "Cu"("NO"_(3))_(2)),(,t. "Zn"("NO"_(3))_(2)):}` |
| Answer» Correct Answer - `A rarr p,s; B rarr q,s; C rarr r,t; D rarr q,t` | |
| 85. |
Extra pure `N_2` can be obtained by heatingA. `NH_(3) " with " CuO`B. `NH_(4)NO_(3)`C. `(NH_(4))_(2) Cr_(2)O_(7)`D. `Ba(N_(3))_(2)` |
| Answer» Correct Answer - D | |
| 86. |
Which of the following does not give oxygen on heating?A. `(NH_(4))_(2) Cr_(2) O_(7)`B. `KClO_(3)`C. `Zn(ClO_(3))_(2)`D. `K_(2)Cr_(2)O_(7)` |
| Answer» Correct Answer - A | |
| 87. |
The compound which gives oxygen on moderate heating isA. Cupric oxideB. Mercuric oxideC. Zinc oxideD. Aluminium oxide |
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Answer» Correct Answer - B `2HgO overset(450^(@))rarr 2Hg + O_(2)` |
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| 88. |
Which of the following oxides of Nitrogen is NeutralA. `N_(2)O_(5)`B. `N_(2)O_(3)`C. `N_(2)O_(4)`D. `N_(2)O` |
| Answer» Correct Answer - D | |
| 89. |
Following are neutral oxides except :A. NOB. `N_(2)O`C. `CO`D. `NO_(2)` |
| Answer» Correct Answer - D | |
| 90. |
Which of the following oxides is amphoteric in nature ?A. `N_(2)O_(3)`B. `P_(4)O_(6)`C. `Sb_(4)O_(5)`D. `Bi_(2)O_(3)` |
| Answer» Correct Answer - C | |
| 91. |
Which of the following statements are correct for `H_(2)O_(2)` ?A. it is neutral towards litmus, but bleaches litmus whiteB. It is more acidic than `H_(2)O`C. Density and dielectric constant are higher than dilute solution of `H_(2)O`D. `H_(2)O_(2)` is produced by auto oxidation of 2-ethyl anthraquinol |
| Answer» Correct Answer - A::B::C::D | |
| 92. |
Which of these statement is true for sodium thiosulphate ?A. it acts as an antichlorB. it is used as a reducing agent in iodometric titrationC. it reacts with hydrochloric acid to form `SO_(2)` and sulphurD. it is used in photography as hypo to dissolve excess of AgBr as a soluble complex |
| Answer» Correct Answer - A::B::C::D | |
| 93. |
Sodium thiosulphate is prepared byA. reducing `Na_(2)SO_(3)` solution with `H_(2)S`B. Boiling `Na_(2)SO_(3)` with S in alkaline mediumC. Neutralising `H_(2)S_(2)O_(3)` solution with NaOHD. Boiling `Na_(2)SO_(3)` with S in an acidic medium |
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Answer» Correct Answer - B `Na_(2)SO_(3) + S underset(OH^(-))overset("Boiling")rarr Na_(2)S_(2)O_(3)` |
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| 94. |
An inorganic iodide (A) on heating gives gases (B) and (C). (B) is neutral towards litmus while (C) is acidic (B) gives back dense white fumes of (A) when cooled with (C). (A) functions as a strong acid in water. (C) is also obtained by action of (D) on water. (D) can be obtained when (B) reacts with `I_(2)` in presence of anhydrous `CaCl_(2)`. (B) is poisonous, has smell of rotten fish and it is sparingly soluble in water. Now answer the following question Select the correct statement from the following for the gas (B)A. It produces dense white fumes with `HCl`B. It produces dense violet fumes on combustionC. It produces dense white fumes with `BF_(3)`D. It can act as oxidising agent |
| Answer» Correct Answer - C | |
| 95. |
Illustrate, how copper gives different products on reaction with `HNO_3`. |
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Answer» On heating with dil `HNO_(3)`, copper nitrate and nitric oxide. `3Cu + 8HNO_(3) ("dil") overset("Heat")rarr 3Cu (NO_(3))_(2) + 4H_(2)O + 2NO` (nitric oxide) With conc. `HNO_(3)` instead of `NO, NO_(2)` is evolved `Cu + 4HNO_(3) ("conc.") overset("Heat")rarr Cu(NO_(3))_(2) + 2H_(2)O + 2NO_(2)` (nitrogen dioxide) |
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| 96. |
Write the allotropic forms of oxygen. |
| Answer» Ordinary oxygen and ozone | |
| 97. |
Which of the following compounds does give `N_(2)` on heating ?A. `NH_(4)NO_(2)`B. `NH_(4)NO_(3)`C. `NaN_(3)`D. Both (A) and (C) |
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Answer» Correct Answer - D (A) `NH_(4)NO_(2) overset(Delta)rarr N_(2) + 2H_(2)O`, (B) `NH_(4)NO_(3) overset(Delta)rarr N_(2)O + 2H_(2)O`, (C) `2NaN_(3) overset(Delta) 3N_(2) + 2Na` |
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| 98. |
`xP_(4) + y SO_(2)Cl_(2) rarr` then y/x ? |
| Answer» Correct Answer - 10 | |
| 99. |
Complete hydrolysis product of 1 mole each of following will need how many total number of moles of NaOH for complete neutralisation? `SOCl_(2), SO_(2)Cl_(2), PCl_(3), PCl_(5), NCl_(3)` |
| Answer» Correct Answer - 24 | |
| 100. |
Select the correct statement(s) regarding reaction of `SO_(2) " with " PCl_(5)`A. It is a redox reactionB. One of the product is sulphuryl chorideC. Both the products on addition of water produce strongely acidic solutionD. both the products have same hybridisation of central atom |
| Answer» Correct Answer - C::D | |