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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. |
Most acidic oxide among the following isA. `Cl_(2)O_(5)`B. `Cl_(2)O`C. `Cl_(2)O_(3)`D. `Cl_(2)O_(7)` |
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Answer» Correct Answer - D In case of `Cl_(2)O_(7) , Cl ` has +7 oxidation state ( maximum oxidation state ) and also has highest oxygen content . So, it is most acidic. |
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| 202. |
`ClO^(-)` disproportionate intoA. `Cl^(-) and O `B. `Cl^(-) and ClO_(3)^(-)`C. `Cl and O `D. `Cl^(-) and O^(-)` |
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Answer» Correct Answer - B The hypochlorites `(ClO^(-))` disproportionate on heating as follows `3ClO^(-) to 2Cl^(-) +ClO_(3)^(-)` |
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| 203. |
When thiosulphate ion is oxidised by iodine. which one of the following ion is produced ?A. (A) `SO_3^(2-)`B. (B) `SO_4^(2-)`C. (C) `S_4O_6^(2-)`D. (D) `S_2O_6^(2-)` |
| Answer» Correct Answer - C | |
| 204. |
Which among the following factors is the most important in making fluorine the strongest oxidizing halogen ?A. Electron affinityB. Ionisation enthalpyC. Hydration enthalpyD. Bond dissociation energy |
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Answer» Correct Answer - C `F_(2)` has the most negative `DeltaG^(@)` value which is dependent on hydration enthalpy . |
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| 205. |
The correct sequence of reducing power of halide ions areA. `Cl^(-) gt Br^(-) gt I^-`B. `Br^(-) gt I^(-) gt Cl^(-)`C. `I^(-) gt Br^(-) gt Cl^(-)`D. `Cl^(-) gt I^(-) gt Br^(-)` |
| Answer» Correct Answer - C | |
| 206. |
Fluorine has -1 oxidation state while iodine exhibits oxidation states of -1, +1, +3 ,+5 and +7. This is due toA. fluorine being a gasB. availability of d-orbitals in iodineC. non-availability of d-orbitals in iodineD. none of above |
| Answer» Correct Answer - B | |
| 207. |
Which among the following factors is the most important in making fluorine the strongest oxidizing halogen ?A. (1) Hydration enthalpyB. (2) Ionization enthalpyC. (3) Electron affinityD. (4) Bond dissociation energy |
| Answer» Correct Answer - A | |
| 208. |
Which pseudo-halogen does not have dimeric natureA. cyanogenB. azideC. thiogeneD. selenothigen |
| Answer» Correct Answer - B | |
| 209. |
`{:("Column I","Column II"),((A)PCl_(5),(p)"Angular"),((B)IF_(7),(q)"Pyramidal"),((C)H_(3)O^(+),(r)"Trigonal bipyramidal"),((D)ClO_(2),(s)"Pentagonal bipyramidal"):}`A. `A-r,B-s,C-q,D-p`B. `A-r,B-q,C-p,D-s`C. `A-p,B-s,C-q,D-r`D. `A-s,B-p,C-r,D-q` |
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Answer» Correct Answer - A `A(PCl_(5))-gamma("trigonal bipyramid"),B(IF_(7))-` s (pentagonal bipyramid), `C(H_(3)O^(+))-2NO_(2)+H_(2)Otounderset("(Reducing agent")(HNO_(2))+Hoverset(+5)NO_(3)` q (pyramidal) , `D(ClO_(2))-p("angular")` |
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| 210. |
Give reasons for the following (a) `C Cl_(4)` is immiscible in water, whereas `SiCl_(4)` is easily hydrolysed. (b) Carbon has a strong tendency for catenation compared to silicon. |
| Answer» (i) `C Cl_(4)` is immicible with water and cannot be hydrolysed because the central carbon atom has no vacant orbitals and cannot accept elec tron pairs from `H_(2)O` molecules, On the other hand, `SiCl_(4)` can be easily hydrolysed because silicon atom has vacant 3d orbitals and can accept electron paris from `H_(2)O` molecuels. | |
| 211. |
Oleum isA. castor oilB. oil of vitriolC. fuming `H_(2)SO_(4)`D. None of these |
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Answer» Correct Answer - C Dissulphuric acid `(H_(2)S_(2)O_(7))` is called oleum or fuming sulphuric acid. It is strongest oxidising agent and more powerful dehydrating agent. |
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| 212. |
Bromine can be liberated form potassium bromide solution by the action ofA. Iodine solutionB. Chlorine waterC. Sodium chlorideD. Potassium iodide |
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Answer» Correct Answer - B Since `Cl_2` is a stronger oxidising agent than `Br_2`, so `Cl_2` water will liberate bromine KBr solution |
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| 213. |
Oleum isA. `H_(2)SO_(3)`B. `H_(2)SO_(5)`C. `H_(2)S_(2)O_(7)`D. `H_(2)S_(2)O_(8)` |
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Answer» Correct Answer - C Oleum is chemically `H_2S_2O_(7)` (pyrosulphuric acid ) . |
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| 214. |
Boron nitride is isoelectronic withA. `C_(2)`B. `B_(2)`C. `N_(2)`D. `O_(2)` |
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Answer» Correct Answer - A `{:("Bron nitride(BN)=12electrons"),("B=15 electrons"),("N=7 electrons"),(C_(2)=12e^(-)):}` |
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| 215. |
S - S bond is not present inA. `S_2O_4^(2-)`B. `S_2O_6^(2-)`C. `S_2O_3^(2-)`D. `S_2O_7^(2-)` |
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Answer» Correct Answer - D `S_2O_7^(2-)` ion is : `O-underset(O^-)underset|oversetOoverset(||)S-O-O-underset(O^-)underset(|)oversetoverset(O)(||)S=O` |
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| 216. |
Oleum is chemically known asA. `H_2SO_3`B. `H_2SO_5`C. `H_2S_2O_7`D. `H_2S_2O_8` |
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Answer» Correct Answer - C Oleum is `H_2S_2O_7` (Disulphuric acid ) |
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| 217. |
Nitrogen is chemically inert due toA. low densityB. absence of bond polarityC. its dialomicityD. presence of triple bond |
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Answer» Correct Answer - D `N_2` contains `(N-=N)` triple bond , difficult to break . Therefore less reactive , inert |
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| 218. |
Nitrogen is chemically inert due toA. low densityB. absence of bond polarityC. its diatomicityD. presence of triple bond |
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Answer» Correct Answer - D It is difficult to break triple bond `(N-=N)` |
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| 219. |
Pick up the wrong statement.A. Borax is used in the manufacture of optical glassesB. Borax is used as a fluxC. Borax is used as a water softenerD. Borax is used as a fuel in rockets. |
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Answer» Correct Answer - D Borax is not used as fuel in rockets. |
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| 220. |
Alane is chemicallyA. `AlH_(3)`B. `(AlH_(3))_(n)`C. `LiAlH_(4)`D. none of these |
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Answer» Correct Answer - B `(AlH_(3))_(n)`. |
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| 221. |
Which of the following is more stable?A. `Si^(4+)`B. `Sn^(4+)`C. `Ge^(4+)`D. `Pb^(4+)` |
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Answer» Correct Answer - A Inert pair effect increases down the group and thus, `+4` ionic valence is not shown by lower elements. |
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| 222. |
The coal form containing maximum percentage of carbon is:A. liganiteB. peatC. bituminousD. antracite |
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Answer» Correct Answer - D The purest variety of coal is anthracite. |
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| 223. |
Which is the least pure form of carbon?A. Animal charcoalB. Lamp blackC. Wood charcoalD. Graphite |
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Answer» Correct Answer - A It is a fact. |
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| 224. |
Carbon monoxide is absorbed byA. ammoniacal curpose chlorideB. pyrogallolC. chloroformD. `C Cl_(4)` |
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Answer» Correct Answer - A `CO` is readily absorbed by an ammonical solution of copper `(I)` chloride to give `CuCl.CO.2H_(2)O`. |
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| 225. |
Carbon monoxide will be reduce?A. lithargeB. zinc oxideC. cupric oxideD. ferric oxide |
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Answer» Correct Answer - B `Zn` is stronger oxidation than carbon. |
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| 226. |
Carbon monoxide is prepared byA. heating formic acid with conc. `H_(2)SO_(4)`B. heating potassium ferrocyanide with conc. `H_(2)SO_(4)`C. heating malonic acid with `P_(4)O_(10)`D. hydrolysis of `Mg_(2)C_(3)` |
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Answer» Correct Answer - A::B |
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| 227. |
A considerable part of the harmful ultraviolet radiation of the sun does not reach the surface of earth. This is because in the upper atmosphere, there is a layer ofA. `O_(3)`B. `CO_(2)`C. `SO_(2)`D. `NO` |
| Answer» Correct Answer - A | |
| 228. |
Sulphur on oxidation with hot sulphuric acid gives :A. `SO_(3)`B. `SO_(2)`C. `H_(2)SO_(3)`D. `H_(2)S_(2)O_(3)` |
| Answer» Correct Answer - B | |
| 229. |
Estimation of ozone can be made quantitatively by :A. decomposition into `O_(2)` and absorption of `O_(2)` into pyragallolB. volumetric method using `Kl` and titration of the liberated iodine using hypo solutionC. oxidative ozonolysis methodD. all methods given above |
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Answer» Correct Answer - B `2 KI + H_(2)O + O_(3) to 2KOH + O_(2) + I_(2)` `2S_(2)O_(3)^(2-)+I_(2) to S_(4)O_(6)^(2-) + 2I^(-)` 1 mole of `O_(3)=` 1 mole of `I_(2)=` 2 mole of `S_(2)O_(3)^(2-)` |
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| 230. |
.......A....... is used in the estimation of carbon monoxide . Here , A refers toA. `I_(2)O_(5)`B. `I_(2)O_(7)`C. `BrO_2`D. `BrO_3` |
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Answer» Correct Answer - A `I_2O_5` is used in the estimation of carbon monoxide and it a very good oxidising agent . |
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| 231. |
Estimation of ozone can be made quantitatively by :A. decomposing into and `O_(2)` and absorption of `O_(2)` into pyrogallolB. volumetric method using `KI` and titration of the libertated iodine using hypo solutionC. oxidative ozonolysis methodD. all methods given above |
| Answer» `2KI+H_(2)O+O_(3)rarr2KOH+I_(2)+O_(2)` | |
| 232. |
Which of the following compound is used for estimation of CO?A. `I_(2)O_(4)`B. `I_(4)O_(9)`C. `I_(2)O_(7)`D. `I_(2)O_(5)` |
| Answer» Correct Answer - D | |
| 233. |
The species that undergo(es) disproportionation in al alkaline medium is/are:A. `Cl_(2)`B. `MnO_(4)^(2-)`C. `P_(4)`D. `ClO_(4)^(-)` |
| Answer» Correct Answer - A::B::C | |
| 234. |
Name three oxoacids of nitrogen . Write the disproportionation reaction of that oxoacid of nitrogen is in +3 oxidation state. |
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Answer» Three oxoacids of nitrogen having oxidation state + 3 are (a) `HNO_(2)`, nitrous acid (b) `HNO_(3)` nitric acid ( c) Hyponitrous acid , `H_(2)N_(2)O_(2)` In `HNO_(2)` N is + 3 oxidation state Disproportionation reaction `3HNO_(2)overset("Disproportionation")toHNO_(3)+H_(2)O+2NO` |
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| 235. |
Disproportionation products of `H_(3)PO_(2)` on heating are:A. `H_(3)PO_(3)+PH_(3)`B. `H_(3)PO_(3)+H_(3)PO_(4)`C. `PH_(3)+H_(3)PO_(4)`D. only `PH_(3)` |
| Answer» Correct Answer - C | |
| 236. |
Statement-1 : Fluorine with sodium hydroxide solution does not undergo disproportionation reaction. Statement-2 : Fluorine has the highest SRP value, therefore, it is completely reduced only.A. Statement-1 is True, Statement-2 is True,Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True,Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True |
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Answer» Correct Answer - A |
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| 237. |
The strongest acid amongst the following is:A. (A) `HClO_4`B. (B) `HClO_3`C. (C) `HClO_2`D. (D) HCIO |
| Answer» Correct Answer - A | |
| 238. |
Which element undergoes disproportionation in water ?A. `Cl_(2)`B. `F_(2)`C. `K`D. `Cs ` |
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Answer» Correct Answer - A `Cl_(2) +H_(2)O to H overset(-1)(Cl)+H overset(+1)(Cl)O` |
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| 239. |
Which one of the following reaction of xenon compounds is not Feasible?A. `3XeF_(4)+6H_(2)O to 2Xe + XeO_(3)+12HF + 1.5O_(2)`B. `2XeF_(2)+2H_(2)O to 2Xe + 4HF + O_(2)`C. `XeF_(6)+ RbF to Rb[XeF_(7)]`D. `XeO_(3)+6HF to XeF_(6)+3H_(2)O` |
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Answer» Correct Answer - 4 |
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| 240. |
Which of the following reaction is not feasible?A. `2KI+Br_(2) to 3KBr + I_(2)`B. `2KBr +I_(2) to 2KI+Br_(2)`C. `2KBr + Cl_(2) to 2KCl+ Br_(2)`D. `2H_(2)O+2F_(2) to 4HF +O_(2)` |
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Answer» Correct Answer - B `2KBr +I_(2) to 2KI+Br_(2)` Reaction is not possible because `Br^(-)` ion is not oxidised in `Br_(2)` with `I_2` due to higher electrode potential of `I_2` than bromine. |
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| 241. |
Which of the following halogen hydrides will have the weakest conjugate base?A. (A)HFB. (B)HCIC. (C)HBrD. (D)HI |
| Answer» Correct Answer - D | |
| 242. |
The weakest acid isA. `HI `B. HBrC. HClD. HF |
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Answer» Correct Answer - D HF is the weakest acid . |
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| 243. |
Which one of the following reaction of xenon compounds is not Feasible?A. `XeO_(3)+6HFrarrXeF_(6)+3H_(2)O`B. `3XeF_(4)+6H_(2)Orarr2Xe+XeO_(3)+12HF+1.5O_(2)`C. `2XeF_(2)+2H_(2)Orarr2Xe+4HF+O_(2)`D. `XeF_(6)+RbFrarrRb[XeF_(7)]` |
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Answer» Correct Answer - A `XeF_(6)` has much tendency to hydrolyse . The reverse reaction is more spontaneous . `XeF_(6) + 3H_(2)O rarr XeO_(3) + 6HF` |
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| 244. |
Which of the following is weakest oxidising agent ?A. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)` |
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Answer» Correct Answer - D |
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| 245. |
Which of the following reaction is not feasible?A. `2Kl + Br_(2) rarr 3KBr + I_(2)`B. `2KBr + I_(2) rarr 2Kl + Br_(2)`C. `2KBr + Cl_(2) rarr 2KCl + Br_(2)`D. `2H_(2)O + 2F_(2) rarr 4HF + O_(2)` |
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Answer» Correct Answer - B `2KBr + I_(2) +2KI+Br_(2)` Reaction is not possible because `Br^(-)` ion is not oxidised in `Br_(2)` with `I_(2)` due to higher electrode potential of `I_(2)` than bromine. In halogens, fluorine can displace chlorine bormine and iodine, chlorine can displace bromine and iodine and bromide can displace iodine from their salts. |
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| 246. |
Which has the highest molar heat of vaporisation?A. `HF`B. `HCl`C. `HBr`D. `HI` |
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Answer» Correct Answer - D In case of `HI` due to large size of iodine strong van der Waal forces are present. Hence, it has highest molar heat of vaporisation. |
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| 247. |
Which of the following is the weakest acid?A. `HF`B. `HCl`C. `HBr`D. `HI` |
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Answer» Correct Answer - A `HF` is the weakest acid. Since it is unable to give `H^(+)` ions which are trapped in `H-`bonding. |
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| 248. |
Which of the following reaction is not feasible?A. `2KI+Br_(2)rarr2KBr+I_(2)`B. `2H_(2)O+2F_(2)HF+O_(2)`C. `2KBr+I_(2)rarr2KI+Br_(2`D. `2KBr+Cl_(2)rarr2KCl+Br_(2)` |
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Answer» Correct Answer - C `2KBr+I_(2)rarr2KI+Br_(2)` Iodine is a less electronegative as compared to Bromine, hence iodine does not change `Br^(-)` to `Br_(2)`. |
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| 249. |
Excess of `KI` reacts with `CuSO_(4)` solution and `Na_(2)SO_(3)` solution is added to it. Which of the following statements in incorrect for the reaction?A. `Cu_2I_2` is reducedB. Evolved `I_2` is reducedC. `Na_2S_2O_3` is oxidisedD. `CuI_2` is formed |
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Answer» Correct Answer - D `2CuSO_4 + KI "(excess)" to 2K_2SO_4 + Cu_2I_2 + I_2 uarr` `Na_2S_2O_3 + I_2 to Na_2 S_4 O_6 + 2NaI` |
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| 250. |
In which of the following pairs, the two species are not isostructural?A. `CO_3^(2-)` and `NO_3^(-)`B. `PCl_4^(+)` and `SiCl_4`C. `PF_5` and `BrF_5`D. `AlF_6^(3-)` and `SF_6` |
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Answer» Correct Answer - C (a)`CO_3^(2-)` and `NO_3 to sp^2` hybridised,Trigonal planar (b)`PCl_4^+` and `SiCl_4 to sp^3` hybridised , Tetrahedral (c )`PF_5 to sp^3`d hybridised , Trigonal bipyramidal `BrF_5 to sp^3 d^2` hybridised , Square pyramidal |
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