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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.
| 351. |
Which one of halogen oxidizes water to oxygen with large evolution of heat?A. `F_(2)`B. `Cl_2`C. `Br_(2)`D. `I_(2)` |
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Answer» Correct Answer - A F atoms are reduced to `F^(-)` `2F_(2)+2H_(2)O to 4HF+O_(2)+"Heat"` `3F_(2)+3H_(2)O to 6HF+O_(3)+"Heat"` A similar relation of chlorine with `H_(2)O` occurs, but the reaction is very slow, because the energy of activation is high. |
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| 352. |
AgCl dissolves in `NH_3` solution, due to the formationA. AgOHB. AgC. `Ag_(2)O`D. `[Ag(NH_(3))_(2)]^(+)Cl^(-)` |
| Answer» Correct Answer - D | |
| 353. |
Amongst the compounds, `Mg_2N_2, NH_3 and N_2O_3`nitrogen shows an oxidation state of +3 inA. `N_2O_3` onlyB. `NH_(3) only`C. `NH_(3) and N_2O_3`D. All of the above |
| Answer» Correct Answer - A | |
| 354. |
When a heated Pt wire is introduced into a mixture of `NH_3` and airA. Pt forms the oxideB. `NO and H_2O` are formedC. Pt forms oxide and nitrideD. `N_2O and H_2O` are formed |
| Answer» Correct Answer - B | |
| 355. |
Halogen prepared from sea-weeds isA. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)` |
| Answer» Correct Answer - D | |
| 356. |
Conc. `HNO_3` oxidizes phosphorus toA. `HPO_3`B. `H_3PO_2`C. `H_3PO_4`D. `H_3PO_4` |
| Answer» Correct Answer - D | |
| 357. |
One of the products of a reaction between solid `KMNO_4` and conc. HCl isA. a red liquidB. a greenish yellow gasC. `MnO_(2)`D. `HClO_(4)` |
| Answer» Correct Answer - B | |
| 358. |
When conc. HCl is mixed with conc. `HNO_3`, the species produced areA. `NO_(2), Cl_(2) and H_(2)O`B. `NO, Cl_(2) and H_(2)O`C. `NOCl , Cl_(2) and H_(2)O`D. `NO_(2) and HOCl` |
| Answer» Correct Answer - C | |
| 359. |
mark the element which displaces three halogens from their compoundsA. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)` |
| Answer» Correct Answer - A | |
| 360. |
The common oxidation states shown by halogens areA. `+1, +3, +5, +7 `B. `+1, +2, +4, +6`C. `+1, +2, +3, +4`D. `+1, +3, +4, +6` |
| Answer» Correct Answer - A | |
| 361. |
Which one of the following is the anhydride of HCIO?A. `Cl_(2)O_(7)`B. `Cl_(2)O_(3)`C. `ClO_(2)`D. `Cl_(2)O_(7)` |
| Answer» Correct Answer - D | |
| 362. |
Borax bead test is not given byA. divalent metalsB. heavy metalsC. light metalsD. metal which forms coloured metaborates |
| Answer» Correct Answer - D | |
| 363. |
Carborundum is the commercial name ofA. `H_(3)PO_(4)`B. `Ca(H_(2)PO_(4))_(2)`C. `Al_(2)O_(3)`D. `SiC` |
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Answer» Correct Answer - D |
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| 364. |
`4` moles of `NaBH_(4)` react completely with `I_(2)`. calculate volume of gaseous products at `STP` from above process. (Give you answer by dividing `4.48`) |
| Answer» Correct Answer - B | |
| 365. |
Colour of the bead in borax bead testis mainly due to the formation ofA. metal oxidesB. boron oxideC. metal metaboratesD. elemental boron. |
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Answer» Correct Answer - B |
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| 366. |
(i) What happens when: (a) Borax is heated strongly (b) Boric acid is added to water ( c) Aluminium is treated with dilute `NaOH`. (d) `BF_(3)` is reacted with ammonia. (ii) Explain the following reaction. `CO` is heated with `ZnO`. |
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Answer» Correct Answer - (i)(a)When borax is heated strongly, a transparent glassy bead which consists of sodium metaborate `(NaBO_(2))` and boric anhydride is formed. `Na_(2)B_(4)O_(7). 10H_(2)Ooverset(Delta)toNa_(2)B_(4)O_(7)+10H_(2)O uar r` `Na_(2)B_(4)O_(7)overset(740^(@)C)to 2NaBO_(2)+underset("borax bead")(B_(2)O_(3))` (b)Boric act acts as a weak Lewis acid by accepting a hydroxide ion of water and releasing a proton into the solution. ( c)Dihydrogen is evolved. `2Al(s)+2NaOH(aq)+6H_(2)O(l)to2Na^(+)[Al(OH)_(4)]^(-)(aq)+3H_(2)(g)` (d)`BF_(3)` being a lewis acid accepts a pair of electrons from `NH_(3)` to form the corresponding complex. (ii)`ZnO` is reduced to zinc metal. `ZnO+CO to Zn+CO_(2)` |
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| 367. |
State with equations what happens when borax is heated on a platinum wire Ioop and to the resulting transparent mass, a minute amount of `CuO` is added and the mixture is again heated first in the oxidising flame and then in the reducing flame of a Bunsen burner? |
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Answer» Correct Answer - When a borax is heated on a platinum wire loop, a transparent glassy beat called the borax bead is formed. `Na_(2)B_(4)O_(7) . 10H_(2)Ounderset(-10H_(2)O)overset(Delta)toNa_(2)B_(4)O_(7)overset(740^(@)C)to ubrace(2NaBO_(2)+B_(2)O_(3))_("glassy mass");` When this transparent glassy bead is heated with `CuO` in the oxidising flame, it imparts blue colour to the bead due to the formation of cupric metaborate. `CuO + B_(2)O_(3) overset("oxidising flame")to Cu(BO_(2))_(2)`(blue bead) However, when cupric metaborate is heated in the reducing flame of the Bunsen burner, the blue cupric metaborate is reduced by carbon present in the flame first to colourless coprous metaborate and then to metal which produces red scales. `underset("Cupric metaborate")(2Cu(BO_(2))_(2))+C to underset("Cuprous metaborate")(2CuBO_(2)+B_(2)O_(3))+CO` `overset(("blue"))(2CuBO_(2))+C to undersetunderset(("red"))("Copper metal")(2Cu overset(("Colourless"))(+)B_(2)O_(3))+CO` |
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| 368. |
Which of the following is used in purifying air of crowded places ?A. `O_2`B. `O_3`C. `Cl_2`D. `SO_2` |
| Answer» Correct Answer - B | |
| 369. |
Which is/are true in case of `BF_(3)` ?A. It is volatile liquid even at room temperatureB. It is Lewis acidC. It has planer geometryD. It forms adduct with `NH_(3)` |
| Answer» Correct Answer - B::C::D | |
| 370. |
Write the balanced equations for the reactions of the following compounds with water: (i) `AI_(4)C_(3)` (ii) `CaNCN` (iii) `BF_(3)` (iv) `NCI_(3)` (v) `XeF_(4)` |
| Answer» Correct Answer - A::B::C::D | |
| 371. |
Write balanced equations for the sollowing reactions: Tin is treated with an excess of chlorine gas. |
| Answer» Correct Answer - A::B::C::D | |
| 372. |
Complete the following reaction : `C`(graphite) + `HNO_(3)` (conc.) `to` |
| Answer» Correct Answer - A::B::C::D | |
| 373. |
Classify sollowing oxides sa neutral, acidic, basic or amphoteric. `CO,SiO_(2),CO_(2),Al_(2)O_(3),TI_(2)O_(3)` |
| Answer» Correct Answer - A::B::C::D | |
| 374. |
Metalloid among the following isA. `Si`B. `C`C. `Pb`D. `Ge` |
| Answer» Correct Answer - D | |
| 375. |
The elements which exists in the liquid state is/ areA. bromineB. mercuryC. galliumD. all of these |
| Answer» Correct Answer - D | |
| 376. |
Coal gas is a mixture of:A. `CO` and `H_(2)`B. `H(2)`, saturated and unsaturated hydrocarbons, `CO,CO_(2),N_(2)` and `O_(2)`C. saturated and unsaturated hydrocabonsD. `CO,CO_(2)` and `CH_(4)` |
| Answer» Correct Answer - B | |
| 377. |
Polonium is a radioactive element. This element w discovered byA. FaradayB. LewisC. Marie CurieD. Fajan |
| Answer» Correct Answer - C | |
| 378. |
Which of the elements is/are semiconductor(s) ?A. OxygenB. SulphurC. SeleniumD. Selenium and tellurium |
| Answer» Correct Answer - D | |
| 379. |
The liquified metal expanding on solidification is :A. `Ga`B. `Al`C. `Zn`D. `Cu` |
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Answer» Correct Answer - A Gallium with low melting point `(303 K)`, could exist in liquid state during summer which on solidification expands. |
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| 380. |
Which of the group 16 elements is not called chalcogen ?A. SB. SeC. TeD. Po |
| Answer» Correct Answer - D | |
| 381. |
Elements of group `14`A. exhibit oxidation state of `+4` onlyB. exhibit oxidation state of `+2` and `+4`C. form `M^(-2)` and `M^(4+)` ionsD. form `M^(2+)` and `M^(4+)` ions |
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Answer» Correct Answer - B They have valence shell electron configuration `ns^(2)np^(2)` , so two electrons of `p` sub shell or four elecrtrons of `s` and `p` sub shells can participate in chemical bonding. |
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| 382. |
Which of the following elements of group 15 in a typical metal ?A. PB. AsC. SbD. Bi |
| Answer» Correct Answer - D | |
| 383. |
Which readily form `p pi-p pi` multiple bonds with itself and with C and O among VA group elements ?A. NB. PC. AsD. Bi |
| Answer» Correct Answer - A | |
| 384. |
Borax is prepared by treating coleminate withA. `NaNO_(3)`B. `NaCl`C. `Na_(2)CO_(3)`D. `NaHCO_(3)` |
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Answer» Correct Answer - C `Ca_(2)B_(6)O_(11)+Na_(2)CO_(3)to 2CaCO_(3) darr +Na_(2)B_(4)O_(7)+2NaBO_(2)` |
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| 385. |
Hydrogens bonding does not play any role in boiling ofA. `NH_(3)`B. `H_(2)O`C. HID. `C_(2)H_(5)OH` |
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Answer» Correct Answer - C Hydroggen bonding is absent in HI while it is present in `NH_(3), H_(2)O and C_(2)H_(2)OH`. |
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| 386. |
`Br^(-)` is converted into `Br_(2)` by usingA. `Cl_2`B. `"Conc."HCl`C. HBrD. `H_(2)S` |
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Answer» Correct Answer - A `Cl_(2)+2Br^(-) to 2Cl^(-)+Br_(2)` |
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| 387. |
The hybridization of boron in the stable borane having thelowest molecular weight is-A. `sp^(2) `B. `sp^(3) `C. `sp `D. `sp^(3)d` |
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Answer» Correct Answer - B |
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| 388. |
The value of n in the molecular formula `Be_(n)Al_(2)Si_(6)O_(18)` is: |
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Answer» Correct Answer - C `Be_(n)Al_(2)Si_(6)O_(18)`.The value of `n` comes `3` by charge balancing. `(Be^(2+))_(n)(Al^(3+))_(2)(Si_(6)O_(18))^(12-) [2xxn+2(+3)+(-12)=0 therefore n=3]` |
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| 389. |
Which one of the following molecule is not trigonal pyramidal ?A. `NF_(3)`B. `NCl_(3)`C. `PH_(3)`D. `BF_(3)` |
| Answer» Correct Answer - D | |
| 390. |
Which would Ihave trigonal planar shape ?A. `CH_(3)`B. `ClO_(2)^(+)`C. `H_(3)O^(+)`D. `ClO_(3)^(-)` |
| Answer» Correct Answer - A | |
| 391. |
The type of hybrid orbitals used by the chlorine atom in `CIO_(2^(-))` isA. spB. `sp^(2)`C. `sp^(3)`D. none of these |
| Answer» Correct Answer - C | |
| 392. |
The type of hybrid orbitals used by the chlorine atom in `CIO_(2^(-))` isA. `sp^(3)`B. `sp^2`C. spD. none of these |
| Answer» Correct Answer - A | |
| 393. |
`Ca_(2)B_(6)O_(11)+2Na_(2)CO_(3)to X+2CaCO_(3)+2NaBO_(2)` The compound X in the above reaction isA. `Na_(2)B_(4)O_(7)`B. `HBO_(2)`C. `H_(3)BO_(3)`D. `H_(2)B_(4)O_(7)` |
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Answer» Correct Answer - A `underset("Colemanite")(Ca_(2)B_(6)O_(11))+2Na_(2)CO_(3) to underset((X)("Borax"))(Na_(2)B_(4)O_(7))+2NaBO_(2)+2CaCO_(3)` |
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| 394. |
`H_(3)BO_(3)` is :A. monobasic and weak lewis acidB. monobasic and weak Bronsted acidC. monobasic and strong Lewis acidD. tribasic and weak Bronsted acid |
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Answer» Correct Answer - A `B(OH)_(3)+2H_(2)O hArr [B(OH)_(4)]^(-)+H_(3)O^(+)` Here, Boron completes its octet by accepting the `OH^(-)` from water molecule.So boric acid `H_(3)BO_(3)` is monobasic and weak Lewis acid and not proton donor (as it does not give proton). Back-bonding in `H_(3)BO_(3)` makes it weak. |
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| 395. |
Tourmalene is a class of cyclosilicates with general formula. `(Ca, K, Na) (Al, Fe, Li, Mg, Mn)_(3)(Al, Cr, Fe, V)_(6) (BO_(3))_(3) (Si, Al, B)_(6)O_(18)(OH, F)_(4)` Which of the following is not a correct example of tourmalene ?A. `CaAl_(3)Fe_(6)(BO_(3))_(3)S_(6)O_(18)F_(4)`B. `Ca_(2)Li_(3)V_(6)(BO_(3))_(3)Si_(6)O_(18)(OH)_(4)`C. `KMg_(3)Cr_(6)(BO_(3))_(3)Si_(6)O_(18)F_(4)`D. `CaAl_(9)(BO_(3)_(3)Si_(6)O_(18)(OH)_(4)` |
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Answer» Correct Answer - A You are not expected to have a prior knowledge of tournaline.It is simply a common-sense based question based on adding all the changes. `(1)+2+3xx3+x xx 6-3xx3+4xx6-2xx18-1xx4` `=6 xx -14 ne 0` for `x=+2` or `+3` (possible on Fe) `(2)+2xx2+1xx3+3xx6-3xx3+6xx4-18xx2-1xx4=0` it fits so it is possible `(3)+1xx1+2xx3+3xx6-3xx3+4xx6-2xx18-1xx4=0` `(4)+2xx1+9xx3-3xx3+6xx4-2xx18-1xx4=0` |
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| 396. |
Boron of highest purity `(~99.9%)` is obtained byA. reduction of `B_(2)O_(2)` by `Mg`.B. electrolysis of fused tetrafluoroborates `(KBF_(4))` in molten `KF`.C. reduction of `BCl_(3)` with `H_(2)` at `1270 K`.D. thermal decomposition of boranes at `1173 K`. |
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Answer» Correct Answer - C Boron of maximum purity `(~99.9%)` is obtained by the reduction of `BCl_(3)` with `H_(2)` at `1270 K`. |
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| 397. |
How many compounds form acidic solution when dissolved in water `H_(3)PO_(4), H_(3)BO_(3),Na_(2)B_(4)O_(7).10H_(2)O, H_(3)P_(3)O_(9), Ba(OH)_(2) Ca(OH)_(2),PbO,CO` |
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Answer» Correct Answer - C Acidic nature , `H_(3)PO_(4),H_(3)BO_(3),H_(3)P_(3)O_(9)` Basic nature , `Na_(2)B_(4)O_(7).10H_(2)O, Ba(OH)_(2), Ca(OH)_(2)` Amphoteric , `PbO` Neutral oxide , `Co` |
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| 398. |
Amorphous boron of `95%` to `98%` purity is obtained by:A. heating `B_(2)O_(3)` with `H_(2)`B. heating `B_(2)O_(3)` with `Mg` or `Na` at high temperature.C. heating `KBF_(4)` with `Na` or `K`.D. heating `BBr_(3)` with `H_(2)` in presence of a catalyst. |
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Answer» Correct Answer - B `B_(2)O_(3)+3Mg` or `Naunderset(Delta)overset("High temperature")to2B+3MgO //Na_(2)O` |
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| 399. |
Which of the following is/are true about silicones.A. Silicones contain repeated `R_(2)SiO` unitsB. `RSiCl_(3)` gives a complex cross linked siliconesC. `(CH_(3))_(2) SiCl_(2)` gives a chain siliconesD. When silicone undergo combustion, it form solid white powder as one of the products. |
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Answer» Correct Answer - A::B::C::D Conbustion of silicone produce solid silica. |
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| 400. |
Reaction I : `3C` ( natural graphite) + `SoO_(2)overset("heat")tounderset(+2CO)(SiC)overset(2500^(@)C)to C` (graphite) +`Si` Reaction II : `SiO_(2)+2CtoSi+2CO` Reaction I is used in production of synthetic graphite, whereas Reaction II is used in extraction od silicon.A. Reaction I - `SiO_(2)` in excess , Reaction II - `SiO_(2)` in excessB. Reaction I - `C` in excess , Reaction II - `SiO_(2)` in excessC. Reaction I - `SiO_(2)` in excess , Reaction II - `C` in excessD. It does not matter. |
| Answer» Correct Answer - B | |