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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.
| 1251. |
`BaO_(2)` and ozone reacts to produceA. `Ba `B. `Ba_(2)O_(3)`C. `BaO `D. `Ba(OH)_(3)` |
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Answer» Correct Answer - C `BaO_(2)+underset("(Ozone)")(O_3) to BaO +2O_(2)` |
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| 1252. |
When lead nitrate is heated , it givesA. `NO_(2)`B. `NO `C. `N_(2)O_(5)`D. `N_2O` |
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Answer» Correct Answer - A Lead nitrate decomposes on heating and gives lead monoxide and `NO_(2)` gas . `2Pb(NO_(3))_(2) to 2PbO+4NO_(2)+O_(2)` |
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| 1253. |
The molecular structure of noble gases areA. diatomicB. monoatomicC. tetra-atomicD. triatomic |
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Answer» Correct Answer - B Noble gas `(ns^2 np^6)` - zero valence . `therefore` Monoatomic |
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| 1254. |
Statement-1 : Sulphuric acid is less viscous than water due to intermolecular hydrogen bonding. Statement-2 : Concentrated sulphuric acid is used as dehydrating agent.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-14B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-15C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - D Statement-1 : `H_(2)SO_(4)` is more viscous due to the greater extent of intermolecular `H`-bonding then water. Statement-2 :Concentrated sulphuric acid is a strong dehydrating agent.Many wet gases can be dried by passing them through sulphuric acid, provided the gases do not react with the acid.Sulphuric acid removes water from organic compound.it is evident by its charring action on carbohydrates. `C_(12)H_(22)O_(11)overset(H_(2)SO_(4))to12C+11H_(2)O , H_(2)C_(2)O_(4) underset(-H_(2)O)overset(H_(2)SO_(4))toCO+CO_(2)` |
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| 1255. |
The lightest, non-inflammable gas isA. `O_2`B. `N_2`C. `H_2`D. He |
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Answer» Correct Answer - D He (Mass no.=4) is lightest and non inflammable |
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| 1256. |
Statement-1 : Mobility of mercury `(Hg)` decreases and its starts sticking to glass when it brought in contract with ozone. Statement-2 : Ozone oxidises mercury to `Hg_(2)O` which dissolves in mercury. Statement-2 : ozone oxidises mercury to `Hg_(2)O` which dissolves in mercury.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-13B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-14C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
| Answer» Correct Answer - A | |
| 1257. |
`SO_2` can be obtained from which of the following reaction?A. Reaction with dil. `H_2SO_4` with `O_2`B. Hydrolysis of dil. `H_2SO_4`C. Reaction of conc. `H_2SO_4` with CuD. None |
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Answer» Correct Answer - C `Cu+2H_2SO_4 to CuSO_4 + SO_4 + 2H_2O` |
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| 1258. |
The inert gas abundantly found in atmosphere is:A. XeB. KrC. ArD. He |
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Answer» Correct Answer - C Ar (0.93% by volume ) in atmosphere |
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| 1259. |
The none-existent species isA. `XeF_(6)`B. `XeF_(5)`C. `XeF_(4)`D. `XeF_(2)` |
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Answer» Correct Answer - B |
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| 1260. |
The inert gas abundantly found in atmosphere is:A. NeB. KrC. HeD. Ar |
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Answer» Correct Answer - D In atmosphere , inert gases are present in very small quantities . Among inert gases , Argon (Ar ) is most abundant . |
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| 1261. |
The compound formed when Mercury comes in contact with ozone isA. HgOB. `Hg_2O`C. `H_2O`D. `HgO_3` |
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Answer» Correct Answer - B `O_3 to O_2 + [O], 2Hg + [O] to Hg_2O` |
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| 1262. |
The inert gas abundantly found in atmosphere is:A. ArB. KrC. HeD. Xe |
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Answer» Correct Answer - A |
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| 1263. |
Which one of the following noble gases is not found in atmosphere ?A. (A) RnB. (B) KrC. NeD. (D) Ar |
| Answer» Correct Answer - A | |
| 1264. |
Which noble gas does not occur in atmosphere?A. RadonB. XenonC. HeliumD. Krypton |
| Answer» Correct Answer - A | |
| 1265. |
Name the following : noble gas not present in atmosphere |
| Answer» Radon is not present in atmosphere. | |
| 1266. |
The shape of all tetrafluorides of group 16 isA. PyramidalB. LinearC. Trigonal bipyramidalD. Tetrahedral |
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Answer» Correct Answer - C Trigonal bipyramidal because of `sp^3d` hybridisation |
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| 1267. |
Which of the following gaseous molecules is monoatomic ?A. (A) chlorineB. (B) helliumC. (C) oxygenD. (D) nitrogen |
| Answer» Correct Answer - B | |
| 1268. |
Which one of the following noble gases is not found in atmosphere ?A. RnB. KrC. NeD. Ar |
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Answer» Correct Answer - A |
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| 1269. |
The only element in group 16 whose hydride is colourless liquid isA. SulphurB. SeleniumC. OxygenD. Tellerium |
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Answer» Correct Answer - C Hydride of oxygen is `H_2O` which is colourless liquid |
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| 1270. |
Which of the following gaseous molecules is monoatomic ?A. chlorineB. heliumC. oxygenD. nitrogen |
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Answer» Correct Answer - B |
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| 1271. |
Out of `H_(2)O,H_(2)S,S_(2)Se`, Hydride which has largest `M-H` length also has:A. largest HMH bond angleB. weakest reducing strengthC. most effective for forming co-odinate bond with `H^(+)`D. largest `H^(+)` donating ability `(K_(a))` |
| Answer» Correct Answer - D | |
| 1272. |
The formation of `O_(2)^(+)[PtF_(6)]^(-)` is the basis for the formation of xenon fluorides. This is because:A. `O_(2)` and `Xe` have comparable sizes.B. both `O_(2)` and Xe are gases.C. `O_(2)` and Xe have comparable ionisation energies.D. `O_(2)` and Xe have comparable electronegativities. |
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Answer» Correct Answer - C |
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| 1273. |
`Pt+MF_(4) rarr PtF_(4)+M` above reaction is easily completed when `MF_(4)` is L:A. `CF_(4)`B. `SF_(4)`C. `XeF_(4)`D. All are possible |
| Answer» Correct Answer - C | |
| 1274. |
The oxidation state of `Pt` in `Xe^(+)[Ptf_(6)]^(-)` isA. `+4`B. `+5`C. `+6`D. none |
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Answer» Correct Answer - B `[PtF_(6)]^(-1)` `X+6(-1)=-1,X=+5`. |
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| 1275. |
Asseration: The first real compound of the noble gases in `1962 "was" Xe^(+)[PtF_(6)]^(-)`. Reason: The discovery was based on the basis of comparable ionisation energy of `O_(2)` and `Xe` and a compound `O_(2)^(+)[PtF_(6)]^(-)` was prepared by Bartlett which was later on reported to be `[XeF]^(+)[Pt_(2)F_(11)]^(-)`.A. If both asseration and reson are true and the reason is the correct explanation of the asseration.B. If both asseration and reason are true ans the reason is the correct explanation of the asseration.C. If asseration is true but reason is false.D. If asseration is false but reason is true. |
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Answer» Correct Answer - A Explanation is correct reason for statement. |
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| 1276. |
Asseration: The first real compound of the noble gases in `1962 "was" Xe^(+)[PtF_(6)]^(-)`. Reason: The discovery was based on the basis of comparable ionisation energy of `O_(2)` and `Xe` and a compound `O_(2)^(+)[PtF_(6)]^(-)` was prepared by Bartlett which was later on reported to be `[XeF]^(+)[Pt_(2)F_(11)]^(-)`.A. If both asseration and reson are true and the reason is the correct explanation of the asseration.B. If both asseration and reason are true ans the reason is the correct explanation of the asseration.C. If asseration is true but reason is false.D. If asseration is false but reason is true. |
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Answer» Correct Answer - A Explanation is correct reason for statement. |
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| 1277. |
Asseration: Inert gases are monoatomic. Reason: Inert gases have stable configuration.A. If both assertion and reason are true and reason is the true explanation of the asseraton.B. If both asseration and reason are true but the reason is not the correct explanation of asseration.C. If the asseration is true but reason is false.D. If asseration is false but reason is true. |
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Answer» Correct Answer - A Both asseration and reason are true and the reason is the correct explanation of the asseration. |
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| 1278. |
Borax is used as buffer since :A. Its aqueous solutions contains equal amount of weak acid and saltB. It is easily availableC. It is aqueous solution contains equal amount of strong acid and its saltD. Staments that borax is a buffer, is wrong |
| Answer» Correct Answer - A | |
| 1279. |
Which of the following reactions forms the basis of goldschmidt aluminothermite process ?A. `2Al+N_(2)to2AlN`B. `2Al+3Cl_(3)to2AlCl_(3)`C. `2Al+6HCLto2AlCl_(3)+3H_(2)`D. `2Al+Fe_(2)O_(3)toAl_(2)O_(3)+2Fe` |
| Answer» Correct Answer - D | |
| 1280. |
In Goldschmidt reaction, certain metallic oxides are reduced to the metallic by oxides are reduced to the metallic state by heating with:A. metallic magnesiumB. Metallic aluminiumC. Metallic ironD. sodium metal |
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Answer» Correct Answer - B `2Al+Fe_(2)toAl_(2)O_(3)+2Fe, DeltaH=-ve` The heat given out is wedling. This is also called Gold Schmidt at aluminothermic process. |
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| 1281. |
In the electrolysis of alumina, cryolite is added toA. lower the melting point of aluminaB. increaases the electrical conductivityC. both (a) and (b)D. remove impurities from alumina |
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Answer» Correct Answer - A Cryolite `(Na_(2)AlF_(6))` is added to `Al_(2)O_(3)` before electrolysis to lower the fusion temperature of bauxite in order to dissolve it and to make it good conductor of current. |
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| 1282. |
The major role of flourspar, `CaF_(2)` which is added in small amount in the electrolytic reduction of `Al_(2)O_(3)` dissolved on fused cryolite in fused cryolite isA. as a catalystB. to make the fused mixture very conductingC. to increases the temperature of the meltD. to decreases the rate of oxidation of carbon at the anode |
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Answer» Correct Answer - B Addition of `CaF_(2)` to alumina dissolve in `Na_(2)AlF_(6)` makes it more conducting. |
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| 1283. |
Aluminium metal is purified by `:`A. reducing `Al_(2)O_(3)` with cokeB. electrolysing `Al_(2)O_(3)` dissolved in `Na_(2)AlF_(6)`C. reducing `Al_(2)O_(3)` with chromiumD. heating `Al_(2)O_(3)` and cryolite |
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Answer» Correct Answer - B `Al` from `Al_(2)O_(3)` can be obtained only by electrolysis of fused `Al_(2)O_(3)` due its great affinity for oxygen. |
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| 1284. |
Aluminium metal is purified by `:`A. electrolyzing `Al_(2)O_(3)` dissolve in `Na_(2)AlF_(6)`B. reducing `Al_(2)O_(3)` with cokeC. reducing `AlO_(3)` with chromiumD. heating `Al_(2)O_(3)` and cryolite |
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Answer» Correct Answer - A `Al` from `AlO_(3)` can be obtained only by electrolysis of fused `Al_(2)O_(3)` dissolve in `Na_(3)AIF_(6)`. |
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| 1285. |
Aluminium chloride exists as dimer. Give reason.A. Cannot from a trimerB. Has high ionisation energyC. Belongs to third groupD. Can have higher coordination number |
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Answer» Correct Answer - D `AlCl_(3)` has high coordination number. |
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| 1286. |
Aluminium chloride exists as aA. MonomerB. DimerC. TrimerD. Polymer |
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Answer» Correct Answer - B `AlCl_(3)` is electron deficient. Al completes its octate by forming a dimer `Al_(2)Cl_(6)`. |
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| 1287. |
Which property is not exhibited by carbon in its compounds ?A. Forming bonds to other carbon atomsB. Forming multiple bondsC. Exhibiting allotropic formsD. Forming compounds with coordination number beyond four. |
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Answer» Correct Answer - D Carbon cannot expand its coordination number beyond four due to the absence of d-orbitals. |
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| 1288. |
Select the correct statement about follwing reaction: `"x- sulphur"underset(lt369K)overset(396K)iff "y-sulphur"` At 369 K both the forms ar stable. This temperature is called transition temperaturesA. x is `(alpha)` rhombic sulphurB. y is `(beta)` Monoclinic sulphurC. Both x and y sulphur are readily soluble in `CS_(2)`D. All are correct |
| Answer» Correct Answer - D | |
| 1289. |
Which of the following condition is used to find atomic `Cl_(2)` from molecular `Cl_(2)`?A. High tempreture, high pressureB. Low tempreture, high pressureC. High tempreture, low pressureD. Low tempereature, low pressure |
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Answer» Correct Answer - C `ubrace(Cl_(2))_(1"mole")toubrace(2Cl)_(2 "moles") DeltaH=+ve` High temperature and low pressure is favourable. |
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| 1290. |
Flurorine is prepared byA. Oxidation of `HF`B. Electrolysis of `KF`C. Electrolysis of fused `KHF_(2)`D. Decomposition of `HgF_(2)` |
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Answer» Correct Answer - C `KHF_(2)rarrKF+HF` `KFrarrK^(+)+F^(-)` At cathode: `K^(+)+e^(-)rarrK` `2K+2HFrarr2KF+H_(2)` At anode:`F^(-)rarrF+e^(-)` `F+FrarrF_(2)` |
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| 1291. |
In the oxyacids of chlorine `Cl-O` bond containsA. `dpi-dpi` bondingB. `ppi-dpi` bondingC. `ppi-ppi` bondingD. None of these |
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Answer» Correct Answer - B `underset(dpi)underset(darr)(Cl)-underset(p pi)underset(darr)(O^(-))` |
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| 1292. |
`ClF` on hydrolysis formsA. `HCl+HOF`B. `Cl_(2)O+HF`C. `HOCl+HF`D. None these |
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Answer» Correct Answer - C `ClF+H_(2)OrarrHOCl+HF` |
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| 1293. |
Carbogen is:A. used by victims of `CO` for respirationB. Used by pneumonia pateins for respirationC. mixture of `O_(2)+5-10%CO_(2)`D. all of the above |
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Answer» Correct Answer - D These are characterstics of carbogen. |
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| 1294. |
The `C-X` bond energy order for carbon tetrahalies is:A. `Cl_(4)gtCBr_(4)gtC Cl_(4)gtCF_(4)`B. `C Cl_(4)gtCBr_(4)gtCl_(4)gtCF_(4)`C. `CF_(4)gtC Cl_(4)gtCBr_(4)gtCl_(4)`D. none of these |
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Answer» Correct Answer - C The `C-H` bond energy in `CF_(4), C CI_(4), CBr_(4)` and `Cl_(4)` are `116,81,68` and `51 kJ` respectively. |
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| 1295. |
What gas is produced when dilulte `HNO_(3)` is added to silver metal?A. NOB. `H_(2)`C. `NH_(3)`D. `N_(2)` |
| Answer» Correct Answer - C | |
| 1296. |
Which of the following is the correct statement for `PH_(3)`?A. It is less basic than `NH_(3)`B. It is less poisonous than `NH_(3)`C. It does not show reducing propertiesD. None of the above |
| Answer» Correct Answer - A | |
| 1297. |
On heating graphite with conc. `HNO_(3)` repetedly, a yellow mass is obtained which is calledA. Graphite oxideB. Graphite peroxideC. Benzene hexacarboxylic acidD. Graphite nitrate |
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Answer» Correct Answer - C Graphite +Conc.`HNO_(3)to`yellow mass |
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| 1298. |
`CH_(3)-Mg-Br` is an oraganometallic compounds due to :A. `pi`-bond between C and MgB. `Mg-Br` covalent bondC. `sigma`-bond between C and BrD. `sigma`-bond between C and Mg |
| Answer» Correct Answer - D | |
| 1299. |
Which of the following species is not a pseudo halide ?A. `CNO^(-)`B. `RCOO^(-)`C. `OCN^(-)`D. `N N N^(-)` |
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Answer» Correct Answer - B |
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| 1300. |
Conc. `HNO_(3)` is yellow coloured liquid due to:A. dissolution of NO in conc. `HNO_(3)`B. dissolution of `NO_(2)` in conc. `HNO_(3)`C. dissolution of `N_(2)O` in conc. `HNO_(3)`D. dissolution of `N_(2)O_(3)` in conc. `HNO_(3)` |
| Answer» Correct Answer - B | |