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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.
| 301. |
Oxalic acid when heated with `conc. H_2 SO_4` it gives outA. `H_(2)O and CO_(2)`B. `CO and CO_(2)`C. `CO_(2) and H_(2)S`D. oxalic sulphate |
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Answer» Correct Answer - B `underset(COOH)underset(|)(COOH) underset("conc.")overset(H_(2)SO_(4))to CO+CO_(2)+H_(2)O` |
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| 302. |
Bromine can exhiits the following oxidation states.A. `-1,+1,+3,+5`B. `-1,+1,+3`C. `-1,+1,+3,+5,+7`D. `+1,+3,+5` |
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Answer» Correct Answer - A Bromine does not show +7 oxidation state or does not form `BrF_7` compound. |
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| 303. |
Hl when heated with conc. `H_2SO_3`, it formsA. `HIO_(3)`B. `KIO_(3)`C. `I_(2)`D. All of these |
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Answer» Correct Answer - C `2HI+H_(2)SO_(4) to I_(2)+SO_(2)+2H_(2)O` |
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| 304. |
Which one of the following elements has highest ability for catenation ?A. OB. SC. SeD. Te |
| Answer» Correct Answer - B | |
| 305. |
The main source of bromine isA. silver bromide oreB. sea-waterC. the Frasch processD. phosphate rock |
| Answer» Correct Answer - B | |
| 306. |
Which one of the following elements has not been observed to form any compounds ?A. HeB. NeC. ArD. All of the above |
| Answer» Correct Answer - D | |
| 307. |
Which of the following species exists:A. `[BF_(6)]^(3-)`B. `[AIF_(6)]^(3-)`C. `[GaF_(6)]^(3-)`D. `[InF_(6)]^(3-)` |
| Answer» Correct Answer - B::C::D | |
| 308. |
Which does not existsA. `[CF_(6)]^(2-)`B. `[SiF_(6)]^(2)`C. `[GeF_(6)]^(2)`D. `[SnF_(6)]^(2)` |
| Answer» Correct Answer - A | |
| 309. |
Which of the following is hyponitrous acid ?A. `N_2O_5`B. `H_2N_2O_2`C. `HNO_2`D. `H_N_2O` |
| Answer» Correct Answer - B | |
| 310. |
`NO_(3)^(-)` is isoelectronic with,A. `CO_(2)`B. `SO_(2)`C. `CO_(3)^(2-)`D. `SO_(3)^(2-)` |
| Answer» Correct Answer - C | |
| 311. |
Fuming nitric acid is,A. 50% `HNO_(3)`B. 60% `HNO_(3)`C. 68% `HNO_(3)`D. 98% `HNO_(3)` |
| Answer» Correct Answer - D | |
| 312. |
`NO_(3^(-))`, is isoelectronic withA. `CO_(2)`B. `CO_(3)^(2-)`C. NOD. `NO_(2)^(-)` |
| Answer» Correct Answer - B | |
| 313. |
Dilute nitric acid react with copper to give,A. NOB. `N_(2)O`C. `NO_(2)`D. `N_2O_5` |
| Answer» Correct Answer - A | |
| 314. |
In which of following first is more acidic than secondA. `N_(2)O_(3) gt N_(2)O_(5)`B. `Bi_(2)O_(5) gt Bi_(2)O_(3)`C. `P_(2)O_(3) gt P_(2)O_(5)`D. `Sb_(2)O_(3) gt Sb_(2)O_(5)` |
| Answer» Correct Answer - B | |
| 315. |
Conc. `HNO_(3)`, acid react with copper to give,A. NOB. `N_2O`C. `NO_(2)`D. `N_(2)O_(5)` |
| Answer» Correct Answer - C | |
| 316. |
Which of following does not react with conc. `HNO_(3)`A. NB. PC. AsD. Pi |
| Answer» Correct Answer - A | |
| 317. |
Which of following element produces oxide with conc. `HNO_(3)`A. NB. PC. AsD. Sb |
| Answer» Correct Answer - D | |
| 318. |
Write down hydrolysis of: (i) alkyl substituted chlorosilane , (ii) trialkyl chlorosilane |
| Answer» Correct Answer - A::B::C::D | |
| 319. |
Which noble gas does not occur in atmosphere?A. RnB. KrC. NeD. Ar |
| Answer» Correct Answer - A | |
| 320. |
The noble gas which is least abundant isA. ArB. KrC. XeD. Rn |
| Answer» Correct Answer - D | |
| 321. |
Chlorine is liberated, when we heatA. `KMnO_(4)+NaCl`B. `K_(2)Cr_(2)O_(7)+MnO_(2)`C. `Pb_(2)(NO_(3))_(4)+MnO_(2)`D. `K_(2)Cr_(2)O_(7)+HCl` |
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Answer» Correct Answer - D `K_(2)Cr_(2)O_(7)+14HCl to 2KCl+2CrCl_(3)+7H_(2)O+3Cl_(2)` |
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| 322. |
Which of the following has least bond angle?A. `H_(2)O`B. `HCl`C. HBrD. HI |
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Answer» Correct Answer - D In B-A-B type of molecule the bond angle decreases with the increase of the size of centreal atom. Hence, the bond angle decrease as: `H_(2)O gt H_(2)S gt H_(2)Se gt H_(2)Te ` |
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| 323. |
The chief source of iodine in which it is present as sodium iodate isA. Sea weedsB. CalicheC. CarnalliteD. Iodine never exists as sodium iodate |
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Answer» Correct Answer - B Caliche is crude chile salt petre `(NaNO_(2))` which contains about 0.02% iodine as sodium iodate `(NaIO_(3))`. |
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| 324. |
Nitrogen can form `N^(3-)` ion because ofA. high electronegativityB. low electronegativityC. high I.E.D. Low I.E. |
| Answer» Correct Answer - A | |
| 325. |
Which of the following has more atomic sizeA. NB. AsC. PD. Bi |
| Answer» Correct Answer - B | |
| 326. |
Which of the following is fluoroapatiteA. `CaF_23Ca_(3)(PO_(4))_(2)`B. `NaF 3Ca_(3) (PO_(4))_(2)`C. `KF 3Ca_(3) (PO_(4))_(2)`D. `Ca(OH)_(2) 3Ca_(3) (PO_(4))_(2)` |
| Answer» Correct Answer - A | |
| 327. |
Which of the following is most stable to heat?A. HClB. HBrC. HOClD. HI |
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Answer» Correct Answer - A The stability of halogen hydrides to thermal deomposition decreases in the order: `HCI gt HBr gt HI` and this is due to progressive decreases in H-X bond energy. Hydrogen chloride shows little tendency to decompose into its constituent elements when heated , whereas hypochlorous acid (HOCI) decomposes in presence of sunlight. `2HOCl to 2HCl +O_(2)` |
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| 328. |
Which has maximum number of oxo groups ?A. `H_(2)SO_(4)`B. `H_(2)SO_(3)`C. `H_(3)PO_(4)`D. `H_(3)PO_(4)` |
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Answer» Correct Answer - A M=0 bonds are called oxo bonds in organic compounds `H_(2)SO_(4)` has two S=O bonds, where as `H_(2)SO_(3)` has one S=O bond. `H_3PO_(3)` has one P=O and `H_(3)PO_(4)` also has one P=O bond. |
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| 329. |
Which of the following oxo acids of chlorine is the best oxidisinig agent?A. HClOB. `HClO_(2)`C. `HClO_(3)`D. `HClO_(4)` |
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Answer» Correct Answer - A As the oxidation state of halogen atom increases, the halogen-xoygen bond becomes more covalent. As a result, thermal stability of the acid increases and hence, oxidizing power of oxo acid decreases. In other words, the more the oxidation state of the halogen, the lesser is the oxidizing power of its oxo acids. Thus, the oxidizing power oxo acids is in the order `HCIIO gt HCIO, gt HCIO_(3) gt HCIO_4 `. Hence, HCIO is the best oxidizing agent. |
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| 330. |
Which of following statements is false ?A. Density of white phosphorus is less than that of red phosphorusB. White phosphorus is soluble in `CS_2`, but red phosphorus is insoluble in `CS_2`C. Both red and white phosphorus evolves `PH_3` on heating with NaOH solutionD. White phosphorus show phosphorescence, while red phosphorus does not show phosphorescence. |
| Answer» Correct Answer - C | |
| 331. |
The following oxo acids have been arranged in the order decreasing acid strength. ldentify the correct order. `ClOH(I), BrOH(II), IOH(III)`A. `III gt IV gt II gt I`B. `III gt II gt I gt IV`C. `I gt II gt III gt IV`D. `IV gt III gt II gt I` |
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Answer» Correct Answer - D The acidity of oxo acid of the same. halogen increases with the increase in oxidation state the halogen. It is because the release of `H^(+)` in each case would result in the formation of `ClO_(4)^(-)` ions. Now as the number of oxygen atoms increases the ion, the more and more dispersal of negative charge occurs, The more and more dispersal of negative charge results in more and more stabilization of the resulting ion. Since a more stable ion would be formed relatively with more ease, therefore, the ease of formation of ions would be `ClO_(4)^(-) gt ClO_(3)^(-) gt ClO_(2)^(-) gt ClO^(-)`. Thus, the acid strength also follow the same trend as given above. |
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| 332. |
Which of the following is correct about interhalogen compounds?A. These are paramagneticB. These are ionic in natureC. On hydrolysis, less electronegative atom form HXD. on hydrolysis, more electronegative atom form HX |
| Answer» Correct Answer - D | |
| 333. |
Which of the following is a tetrabasic acid?A. Orthophosphoric acidB. Hypophosphoric acidC. Metaphosphoric acidD. Pyrophosphoric acid |
| Answer» Correct Answer - D | |
| 334. |
The stability of interhalogen compounds follows the orderA. `IF_(3) gt BrF_3 gt CIF_(3)`B. `BrF_(3) gt IF_(3) gt CIF_(3)`C. `CIF_(3) gt BrF_(3) gt IF_(3)`D. `CIF_(3) gt IF_(3) gt BrF_(3)` |
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Answer» Correct Answer - A Due to electronegativity difference, the stability of interhologen compounds follows following order: `IF_(3) gt BrF_(3) gt CIF_(3)` |
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| 335. |
The incorrect order of acidic strength is (DCE 2009)A. `HI gt HBr gt HCl`B. `HIO_(4) gt HBrO_(4) gt HClO_(4)`C. `HClO_(4) gt HClO_(3) gt HClO_(2)`D. `HF gt H_(2)O gt NH_(3)` |
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Answer» Correct Answer - B The acidic strength of oxy0acids decreases downwards in a group. The correct order of acidic strength of oxyacids of halogens is `HClO_(4) gt HBrO_(4) gt HIO_(4)`. |
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| 336. |
Among ` KO_2 , AlO_(2)^(-) BaO_2` and `NO_2^+` unpaired electron is present in :A. `NO_(2)^(+) and BaO_(2)`B. `KO_(2) and BaO_(2)`C. `KO_(2) only`D. `BaO_(2)"only "` |
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Answer» Correct Answer - C `KO_(2)` because in `O_(2^(-))` (superoxide ion) One unpaired electron is present in the antibonding orbital. |
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| 337. |
Hypophosphorus acid isA. monobasic acidB. a dibasic acidC. a tribasic acidD. not an acidic at all |
| Answer» Correct Answer - A | |
| 338. |
When chlorine is passed through concentrated solution of KOH, the compound formed is ____________ .A. KClB. `KClO_(3)`C. `KClO_(2)`D. `KClO_(4)` |
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Answer» Correct Answer - B `6KOH+3Cl_(2) to 5KCl+KClO_(3)+3H_(2)O` |
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| 339. |
Which of the following is most electronegative?A. OB. SC. TeD. Se |
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Answer» Correct Answer - A `{:(,"Element",O,S,Sc,Te,Po),(,"Electronegativity",3.5,2.5,2.4,2.1,2.0):}` |
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| 340. |
The highest electron affinity is shown byA. `F_(2)`B. `Br_(2)`C. `Cl_(2)`D. `I_(2)` |
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Answer» Correct Answer - B On moving down the group, electron affinity must decrease, because of the increase in the size of the atom. However, fluorine has lower electron affinity than chlorine. A low value of electron affinity for fluorine is due to the small size of F atom. In a compact 2 p-orbitals. of F, the added electron does not feel much attraction, because of inter-electronic repulsion between the electrons already present in small compact 2p-subshell of F atom. |
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| 341. |
Chlorine reacts with sodium hydroxide under various conditions to giveA. Sodium chlorideB. Sodium hypochloriteC. Sodium chlorateD. All of these |
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Answer» Correct Answer - D `underset(("dil."))(2NaOH^(+))Cl_(2) overset("Cold")to NaCl+ underset("Sod. hypochlorite")(NaClO)+H_(2)O underset(("conc."))(6NaOH)+Cl_(2) overset("heat")to 5NaCl+underset("Sodium chlorate")(NaClO_(3))+3H_(2)O` |
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| 342. |
Electron affinity is positive whenA. `O^(-)` is formed from OB. `O^(2-)` is formed from `O^(-)`C. `O^(+)` is formed from OD. `O^(3-)` is formed from `O^(-)` |
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Answer» Correct Answer - B `O_((g))^(-)+e^(-) to O_(g)^(2-)+E,(DeltaH=ve, "Endothermic").` |
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| 343. |
Ammonia reacts with excess of chlorine to giveA. `NH_(4)Cl`B. `Cl_(2)`C. `NCl_(3)`D. `NCl_(5)` |
| Answer» Correct Answer - C | |
| 344. |
Which of the following has the highest proton affinity ?A. Stibine `(SbH_(3))`B. Arsine `(AsH_(3))`C. Phosphine `(PH_(3))`D. Ammonia `(NH_(3))` |
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Answer» Correct Answer - D `MH_(3)+H^(+) to MH_(4^(+))` As the size of the central atom increases, the stability of the conjugate acid decreases and hence the basic character decreases in the order. `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)` |
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| 345. |
Correct order of decreasing thermal stability isA. `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)`B. `PH_(3) gt NH_(3) gt AsH_(3) gt SbH_(3)`C. `AsH_(3) gt PH_(3) gt NH_(3) gt SbH_(3)`D. `SbH_(3) gt AsH_(3) gt PH_(3) gt NH_(3)` |
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Answer» Correct Answer - A The thermal stability of hydrides of nitrogen family or group 15 elements decreases on moving downwards in the group. Therefore, `NH_(3)` is the most stable and `BiH_(3)` is the least stable. The stability of the hybrides of group 15 elements decreases in the order : `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_3` |
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| 346. |
Match list I with list It and select the correct answer using the codes given below the lists. A. `{:(,A,B,C,D),((a),1,3,4,2):}`B. `{:(,A,B,C,D),((b),1,2,3,4):}`C. `{:(,A,B,C,D),((c),3,4,1,2):}`D. `{:(,A,B,C,D),((d),3,1,2,4):}` |
| Answer» Correct Answer - C | |
| 347. |
Hydrolysis of calcium cyanamide gives Hydrazine is formed when ammonia react withA. `HNO_(3)`B. `Ca(OH)_(2)`C. `H_2SO_4`D. NaOCl |
| Answer» Correct Answer - D | |
| 348. |
calcium cyanamide on treatment with steam under pressure gives ammonia andA. Calcium carbonateB. Calcium hydroxideC. Calcium oxideD. Calcium nitrate |
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Answer» Correct Answer - A `CaCN_(2)+3H_(2)O to CaCO_(3)+2NH_(3)` |
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| 349. |
Nitric acid on standing develops brownish colour, which may be attributed to the presence ofA. `NO_(2)`B. `NO_(2)^(+)"ions"`C. `NO_(3)^(-)"ions`D. `HNO_(2)` |
| Answer» Correct Answer - A | |
| 350. |
The reaction of calcium cyanamide with water yieldsA. `Ca(OH)_(2) and N_(2)`B. `CaC_(2) and N_(2)H_(4)`C. `Ca(HCO_(3))_(2) and NH_(3)`D. `CaCO_(3) and NH_(4)OH` |
| Answer» Correct Answer - D | |