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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.
| 1801. |
A dark violet solid X reacts with `NH_3` to form a mild explosive which decomposes to give a violet coloured gas .X also reacts with `H_2` to give an acid Y. Y can also be prepared by heating its salt with `H_3PO_4 .X and Y` are :A. `Cl_2, HCl`B. `SO_2, H_2SO_4`C. `Br_2,HBr`D. `I_2, HI` |
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Answer» Correct Answer - D |
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| 1802. |
Which of the following compounds is explosive in nature?A. `PCl_5`B. `NCl_3`C. `H_2N_2O_2`D. NOCl |
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Answer» Correct Answer - B `NCl_3` is explosive in nature |
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| 1803. |
Which of the following represents laughing gas?A. `NO`B. `N_(2)O`C. `NO_(2)`D. `N_(2)O_(3)` |
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Answer» Correct Answer - B When `N_(2)O` is inhaled in moderated quantities, it produces hysterical loughter, hence the name laughing gas. |
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| 1804. |
Which is the most explosive?A. `NCl_(3)`B. `PCl_(3)`C. `AsCl_(3)`D. All of these |
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Answer» Correct Answer - A `NCl_(3)` is highly reactive and unstable. Hence it is explosive. |
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| 1805. |
In the catalytic oxidation of ammonia an oxide is formed which is used in the preparation of `HNO_(3)`. This oxide isA. `N_(2)O_(3)`B. `N_(2)O_(4)`C. `NO_(2)`D. `NO` |
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Answer» Correct Answer - D `4NH_(3)+5O_(2)overset(Pt)underset(1100K)(rarr)4NO+6H_(2)O` No is used in the prepareation of `HNO_(3)` `2NO+O_(2)rarr2NO_(2),` `4NO_(2)+2H_(2)O+O_(2)rarr4HNO_(3)` |
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| 1806. |
In the preparation of `HNO_(3)`, we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of `NH_(3)` will beA. 2B. 3C. 4D. 6 |
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Answer» Correct Answer - A `4NH_(3)+5O_(2)overset(Delta)to4NO+6H_(2)Oor2NH_(3)+5//2O_(2)to2NO+3H_(2)O` |
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| 1807. |
Which of the following molucules can show Lewis acidity. (I) `CO_(2)`, (II) `Br_(2)`, (III) `SnCl_(2)` (IV) HF, (V)`NMe_(3)`A. III,IVB. I,II,IIIC. I,III,IVD. II,III,IV |
| Answer» Correct Answer - B | |
| 1808. |
Select the correct order of acidity :A. `HI gt HBr gt HCl gt HF`B. `HCIO_(4) gt HBrO_(4) gt HIO_(4)`C. `HCIO gt HBrO gt HIO`D. `HCIO_(4) gt HBrO_(3) gt HIO_(2) gt HCIO` |
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Answer» Correct Answer - ABD |
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| 1809. |
A red liquid (A) when treated with sodium carbonate gives a mixture of two sails (B) and (C) in the solution In which (C) contains oxygen. The mixture then on acidification with sulphuric acid and distillation produces the red liquid (A) again. Select the correct statement (or the liquid (A).A. It acts as an oxidising agentB. It is sparingly soluble in waterC. It converts the yellow-dye stuff fluorescein (l) into red colour compoundD. All of these |
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Answer» Correct Answer - D |
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| 1810. |
The set with correct order of acidity is :A. `HCIO lt HCIO_(2) lt HCIO_(3) lt HCIO_(4)`B. `HCIO_(4) lt HCIO_(3) lt HCIO_(2) lt HCIO`C. `HCIO lt HCIO_(4) lt HCIO_(3) lt HCIO_(2)`D. `HCIO_(4) lt HCIO_(2) lt HCIO_(3) lt HCIO` |
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Answer» Correct Answer - A |
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| 1811. |
A red liquid (A) when treated with sodium carbonate gives a mixture of two sails (B) and (C) in the solution in which (C) contains oxygen. The mixture then on acidification with sulphuric acid and distillation produces the red liquid (A) again. Which of the following statement is correct?A. Liquid (A) undergoes disproportionation reaction in aqueous solution of sodium carbonateB. The anion of compound ( C) has `sp^(3)` hybridisation and is trigonal pyramidal in shapeC. (A) and (B) bothD. none of these |
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Answer» Correct Answer - C |
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| 1812. |
Give an example of oxidation of halide by another halogen. Explain the feasibility of the reaction. |
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Answer» Correct Answer - `2KI(aq.)+Cl_(2) to 2KCl(aq.) + I_(2)` In the reaction `Cl_(2)` oxidises iodide ion (-1 oxidation state) to `I_(2)` (0 oxidation state).`Cl_(2)` has higher oxidation potential than `I_(2)` and thus oxidises iodide to iodine getting itself reduced to chloride ion. Similarly, `({:(2l^(-),(aq.),to,I_(2)(s),+,2e^(-)),(Cl_(2),(g),+,2e^(-),to,2Cl^(-),(aq.)):})/(2I^(-)(aq)+Cl_(2)(g)toI_(2)(s)+2Cl^(-)(aq.))` |
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| 1813. |
White crystalline solid (A) reacts with `H_2` to form a highly associated liquid (B) and a monoatomic , colourless gas (C ). The liquid (B) is used for etching glass. Compound (A) undergoes hydrolysis slowly to form (C ), (B) and a diatomic gas (D ) whose IE is almost similar to that of (C ). (B) forms an addition compound with KF to form (E) which is electrolysed in the molten state to form a most reactive gas (F) which combines with (C ) in 2:1 ratio of produce (A). Which of the following is correct for the white crystalline solid (A) ?A. It oxidises `F^(-)` to `F_(2)`B. It on hydrolysis with alkali under goes disproportionation.C. It is obtained by the reaction of ( C) with `O_(2)F_(2)` at `118^(@)C`.D. None of these |
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Answer» Correct Answer - C |
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| 1814. |
Draw the structure of white phosphorus and red phosphorus. Which one of these two types of phosphorus, is more reactive and why ? Or Which allotrope of phosphorus is more reactive and why? Or Why is red phosphorus less reactive than white phosphorus. Or Draw the structural difference between white and red phosphorus. |
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Answer» Both white and red phosphorus consist of `P_(4)` tetrahedra. In white phosphorus, the various `P_(4)` molecules are held together by weak van der Waals forces of attraction. In each `P_(4)` molecule, the PPP angle is only `60^(@)` (Fig. 11.31, page 11/127) which is much smaller than the normal tetrahedral angle of `109^(@)-28`. As a result, there is considerable angle strain. Due to weaker forces of attraction and considerable angle strain, white phsphorus is very reactive. In contrast, in red phosphorus, these `P_(4)` tetrahedra are joined together throughi covalent bonds to give polymeric structure (Fig. 11.32, page 11/129). Since it is difficult to break strong covalent bond as compared to weak van der Waals forces of attraction, therefore, white phosphorus is more reactive than red phosphorus. |
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| 1815. |
Red phosphorus is chemically less reactive becauseA. it does not contain P-P bondsB. it does not not contain tetrahedral `P_(4)` moleculesC. it does not catch fire in air even upto `400^(@)`CD. it has a polymeric structure |
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Answer» Correct Answer - D It is a reasons for the given fact |
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| 1816. |
Red phosphorus is denser, less volatile and chemically less reactive than white phosphrous. Explain ? |
| Answer» Correct Answer - A::B::C::D | |
| 1817. |
What happens when white phosphrous is heated with concetrated NaOH solution in an inert atmosphere of `CO_(2)` ? |
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Answer» White phosphours reacts with NaHO to form phosphine. `underset("Phosphorus")(P_(4))+3NaOH+3H_(2)Ounderset(CO_(2)"atmosphere")overset("Heat")tounderset("Phoshine")(PH_(3))+underset("Sod. hypopsphite")(3NaH_(2)PO_(2))` |
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| 1818. |
Which glass has the highest percentage of lead ?A. Soda glassB. Flint glassC. Jena glassD. Pyrex glass |
| Answer» (b) Flint glass or lead glass has composition of `K_(2)OcdotPbOcdot6SiO_(2)`. It is used in making electric bulb and optical instruments. | |
| 1819. |
Why does `"PCl"_(3)` fume in moisture ? |
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Answer» `"PCl"_(3)` hydrolyses in the presence of moisture giving fumes of HCl. `"PCl"_(3)+3"H"_(2)"O"to"H"_(3)"PO"_(3)+3"HCl"` |
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| 1820. |
Explain the following reaction of alkali with red phosphrous. |
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Answer» Red phosphorus reacts with alkalies slowly and forms phosphine and hypophosphite. `P_(4)+3NaOH+3H_(2)OtoPH_(3)+3"NaH_(2)PO_(2)` |
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| 1821. |
Why does `PCl_(3)` fume in moisture ? |
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Answer» `PCl_(3)` hydrolyses in the presence of moisture giving fumes of HCl. `PCl_(3)+3H_(2)OtoH_(3)PO_(3)+3HCl` |
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| 1822. |
Why does `PCL_(5)` fume in moisture? |
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Answer» In presence of moisture `(H_(2)),PCl_(5)` undergoes hydrolysis giving fumes of HCl. `PCl_(5)+4H_(2)Otounderset("Phosphoric acid")(H_(3)PO_(4))+5HCl` |
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| 1823. |
Among the halogens, the one which is oxidised by nitric acid isA. fluorineB. iodineC. chlorineD. bromine |
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Answer» Correct Answer - B Nitric acid oxidises iodine into iodic acid `(HIO_(3))` . `10NHO_3 +I_2 to underset(" Iodic acid ")(2HIO_(3)) +10NO_(2)+4H_(2)O` |
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| 1824. |
Ammonium dichromate is used in some fireworks. The green-coloured powder blown in the air isA. `CrO_3`B. `Cr_2O_3`C. CrD. `CrO (O_2)` |
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Answer» Correct Answer - B `(NH_4)_2Cr_2O_7 oversetDeltato Cr_2O_3 + 4H_2O + N_2` |
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| 1825. |
The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atoms. The hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in `[Be(OH)_(4)]^(-)` and the geometry of the complex are respectivelyA. `sp^(3)`, tetrahedralB. `sp^(3)` square planarC. `sp^(3)d^(2)`, octahedralD. `dsp^(2)`, square planar |
| Answer» Correct Answer - A | |
| 1826. |
Which of the following set of combination is correct ?A. (IV)-S-(i)B. (III)-S-(iii)C. (II)-Q-(ii)D. (I)-Q-(iv) |
| Answer» Correct Answer - B | |
| 1827. |
Which of the following set of combination is correct ?A. (I)-(S)-(iv)B. (II)-(R )-(iii)C. (III)-(Q)-(ii)D. (IV)-(P)-(i) |
| Answer» Correct Answer - B | |
| 1828. |
Which of the following set of combination is correct ?A. (II)-(Q)-(ii)B. (III)-(R )-(iii)C. IV)-(S)-(iv)D. (I)-(P)-(i) |
| Answer» Correct Answer - C | |
| 1829. |
Which of the following set of combination is incorrect ?A. (IV)-S-(i)B. (III)-(P)-(ii)C. (II)-(R )-(iii)D. (I)-(S)-(iv) |
| Answer» Correct Answer - D | |
| 1830. |
Which of the following set of combination is incorrect ?A. (I)-Q-(iv)B. (II)-R-(iii)C. (III)-P-(ii)D. (IV)-P-(i) |
| Answer» Correct Answer - C | |
| 1831. |
On heating `KClO_(3)` we get:A. (A) `KClO_2 +O_2`B. (B) `KCl +O_2`C. (C) `KCl +O_3`D. (D) `KCl +O_2+O_3` |
| Answer» Correct Answer - B | |
| 1832. |
`Cl_2O_6` reacts with water and alkali to give:A. (A) Only sodium chlorateB. (B) Only sodium perchlorateC. (C) Both sodium chlorate and sodum perchlorateD. (D) None of these |
| Answer» Correct Answer - C | |
| 1833. |
Alkali metal hydrogen fluorides have a formula `M[HF_2]`. They are found to contain a linear symmetrical anion having an overall F—H—F distance of 2.26 Å which may be compared with the H—F bond length of 0.92 Å In the moment. Which of the following is false for the anion?A. (A) Hydrogen bonding plays a significant role in the existence of the anionB. (B) Average bond length (H - F) Is 1.13 Å in the anion `HF_2^- `C. C) The stretching of H - F bond in the anion Is 0,21 ÅD. (D) H-atom is bonded to two F-atoms through two T bonds in the anion. |
| Answer» Correct Answer - D | |
| 1834. |
For `H_(2)PO_(3)` and `H_(3)PO_(4)` the correct choice is :A. `H_(3)PO_(3)` "is dibasic and reducuing"B. `H_(3)PO_(3)` "is dibasic and non- reducing"C. `H_(3)PO_(4)` "is tribiasic and reducing"D. `H_(3)PO_(3)` "is tribasic and non- reducing" |
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Answer» Correct Answer - A In `H_(3)PO_(3)`,there are two `OH^(-)` groups i.e. there are two ionisable protons. So it is diabasic in nature. The hydrogen which is directly attached to phosphorous atom is called as reducing hydrogen. `As H_(3)PO_(3)` contains one P-H bond it acts as a reducing agent. |
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| 1835. |
Arrange the hydrides of group `15` in the correct order of reducing natureA. `NH_(3)ltPH_(3)ltAsH_(3)ltSbH_(3)ltBiH_(3)`B. `NH_(3)gtPH_(3)gtAsH_(3)gtSbH_(3)gtBiH_(3)`C. `PH_(3)gtAsH_(3)gtSbH_(3)gtBiH_(3)gtNH_(3)`D. |
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Answer» Correct Answer - A Reducing nature [other reduce and self-oxidises] size `prop` Reducing nature. |
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| 1836. |
Among the hydrides of halogens Which has lowest boiling point ? |
| Answer» Among hydrides of halogens HCl (189K) has lowest boiling point. | |
| 1837. |
Nitrous oxideA. Is a mixed oxideB. Is an acidic oxide.C. Is an acidic oxideD. Is highly soluble in hot water |
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Answer» Correct Answer - D `N_(2)O` is itself non-combustible but supports combustion. `S+2N_(2)OrarrSO_(2)+2N_(2)` |
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| 1838. |
For `H_(3)PO_(3)` and `H_(3)PO_(4)` the correct choice isA. `H_(3)PO_(3)` is dibasic and reducingB. `H_(3)PO_(3)` is dibasic and non-reducingC. `H_(3)PO_(4)` is tribasic and reducingD. `H_(3)PO_(3)` is tribasic and non-reducing |
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Answer» Correct Answer - A `H-Ooverset(H)overset(|)underset(O)underset(|)(P)-OH`, hence it is dibasic. It acts as |
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| 1839. |
Which has the lowest boiling point?A. `NH_(3)`B. `PH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
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Answer» Correct Answer - B `{:("Hydride",NH_(3),PH_(3),AsH_(3),SbH_(3),biH_(3)),("Boiling point",238.5,185.5,210.6,254.6,290):}` |
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| 1840. |
Hydrogen bonding is strongest inA. O - H--- FB. S - H --- OC. F - H --- FD. F- H --- O |
| Answer» Correct Answer - C | |
| 1841. |
Nitrous oxide is known asA. breathing gasB. laughing gasC. exercising gasD. laboratory gas |
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Answer» Correct Answer - B Nitrous oxides is known as laughing gas. |
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| 1842. |
Which of the following compound show sublimation?A. `NH_(4)Cl`B. `CaCO_(3)`C. `BaSO_(4)`D. `CaHPO_(3)` |
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Answer» Correct Answer - A When a solid compound on heating changes into gaseous state without changing into liquid state, the phenomenon is known as sublimation, e.g, `I_(2)`, `NH_(4)Cl` and camphor. |
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| 1843. |
The strongest base isA. `NH_(3)`B. `PH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
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Answer» Correct Answer - A `NH_(3)` is a strongest base because Lone pair is easily available for donation. |
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| 1844. |
The element which forms oxides in all oxidation states ` +1 ` to `+5` is.A. `N`B. `P`C. `As`D. `Sb` |
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Answer» Correct Answer - A Hydrometallurgy is the process of dissolbing the metal or its ore by the actiobn of a suitable chemical regent followed by recovery of the metal either by electrolysis or by the use of a suitable precipitating agent. `4Au+8KCN+2H_(2)O+underset(air)(O_(2))rarr4K[Au(CN)_(2)]+4KOH` `2K[Au(NC)_(2)]+Znrarr2Au+K_(2)[Au(NC)_(4)]` |
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| 1845. |
The element which forms oxides in all oxidation states ` +1 ` to `+5` is.A. AsB. PC. ND. Bi |
| Answer» Correct Answer - C | |
| 1846. |
Oxide of nitrogen used as an oxidiser for rocket fuels in missiles and space vehicles isA. `N_2O`B. `NO_2`C. `N_2O_4`D. NO |
| Answer» Correct Answer - C | |
| 1847. |
Ionisation enthalpy `(Delta_(i) H_1 kj "mol"^(-1))` for the elements of Group 13 follows the order.A. `B gt Al gt Ga gt In gt Tl`B. `B lt Al lt Ga lt In lt Tl`C. `B lt Al gt Ga lt In gt Tl`D. `B gt Al lt Ga gt In lt Tl` |
| Answer» Correct Answer - D | |
| 1848. |
In the laboratory `H_2S ` gas is prepared by using black lumps and dil. `H_2SO_4`. The black lumps areA. `FeSO_(4)`B. `MnO_(2)`C. FeSD. `FeSO_(3)` |
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Answer» Correct Answer - C In laboratory , `H_2S` is prepared by treating ferrous sulphide (black lumps ) with dil. `H_2SO_4`. `FeS +H_(2)SO_(4)("dil.")to FeSO_(4)+H_(2)S ` |
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| 1849. |
Statement-I: Borax bead test is applicable only to coloured salt. Statement-II: In borax bead test, voloured salts are decmosed to give coloured metal meta borates.A. If both statement -I & Statement-II are true & the Statement-II is correct explaination of the statement-I.B. If both Statement-I & Statement-II are true but Statement-II is not a correct explainatin of Statement-I.C. If Statement-I is True but the Statement-II is FalseD. If the Statement-I is False but the Statement-II is True |
| Answer» Correct Answer - A | |
| 1850. |
`Zn` gives `H_(2)` gas with `H_(2)SO_(4)` and `HCl` but not with `HNO_(3)` becauseA. Zn act as oxidising agent when react with `HNO_(3)`B. `HNO_(3)` is weaker acid than `H_(2)SO_(4)` and HClC. In electrochemical series `Zn` is placed above hydrogenD. `NO_(3)^(-)` is reduced in preference to hydronium ion |
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Answer» Correct Answer - D Zn have lower value of `E_("cell")^(@)` and easily gives oxidation. Zn is present above `H_(2)` in electrochemical series. So, it liberates hydrogen gas from dilu. `HCl//H_(2)SO_(4)`. But `HNO_(3)` is an oxidising agent. The hydrogen obtained in this reaction is converted into `H_(2)O` . In `HNO_(3), NO_(3)^(-)` ion is reduced and give `NH_(4)NO_(3), N_(2)O, NO` and `NO_(2)` (based upon the concentration of `HNO_(2)`). `[Zn+underset(("Nearly"6%))(2HNO_(3)) rarr Zn(NO_(3))_(2)+2H]xx4` `({:(HNO_(3)+8HrarrNH_(3)+3H_(2)O),(NH_(3)+HNO_(3)rarrNH_(4)NO_(3)):})/(4Zn+10HNO_(3)rarr4Zn(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O)` |
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