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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.
| 151. |
`N_2` forms `NCl_3` whereas `P` can form both `PCl_3` and `PCl_5`. Why ?A. P has d-orbitals which can be used for bonding but `N_(2)` does not haveB. N atom is large than P in sizeC. P is more reactive towards Cl than ND. None of the above |
| Answer» Correct Answer - A | |
| 152. |
In qualitative analysis when `H_(2)S` is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. `HNO_(3)`, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution givesA. deep blue precipitate of `Cu(OH)_(2)`B. deep blue precipitate of `[Cu(NH_(3))_(4)]^(2+)`C. deep blue precipitate of `Cu(NO_(3))_(2)`D. deep blue percipitate of `Cu(OH)_(2).Cu(NO_(3))_(2)` |
| Answer» Correct Answer - B | |
| 153. |
Non combustible hydride isA. `PH_(3)`B. `SbH_(3)`C. `NH_(3)`D. `AsH_(3)` |
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Answer» Correct Answer - C `NH_(3)` is non combustable hydride |
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| 154. |
Which of the following reaction yield elementary gases like `N_(2),H_(2),O_(2)` as the byproducts ?A. `CuO+NH_(3)rarr`B. `NH_(3)+2Naunderset(300-400^(@)C)overset(Fe)(rarr)`C. `( NH_(4))_(2)Cr_(2)O_(7) overset(Delta)(rarr)`D. `2Pb(NO_(3))_(2)overset(Delta)(rarr)` |
| Answer» Correct Answer - A::B::C::D | |
| 155. |
Which of the following is most basic hydride ?A. `NH_(3)`B. `BiH_(3)`C. `PH_(3)`D. `AsH_(3)` |
| Answer» Correct Answer - A | |
| 156. |
Which is the most explosive?A. `NCl_(3)`B. `NF_(3)`C. `NH_(3)`D. `N_(2)O_(5)` |
| Answer» Correct Answer - A | |
| 157. |
Which of the following hydrides is most thermally stable?A. `PH_(3)`B. `AsH_(3)`C. `NH_(3)`D. `BiH_(3)` |
| Answer» Correct Answer - C | |
| 158. |
The correct order of ease of formation of hydrides, and their stabilities is :A. `NH_(3)gtPH_(3)gt AsH_(3)gtBiH_(3)`B. `BiH_(3)gtAsH_(3)gtPH_(3)gt NH_(3)`C. `NH_(3)gtAsH_(3)gtPH_(3)gtBiH_(3)`D. `BiH_(3)gtPH_(3)gtAsH_(3)gtNH_(3)` |
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Answer» Correct Answer - A `NH_(3)` to `BiH_(3)`-Thermal stability decreases |
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| 159. |
The element which gives explosive halides isA. PhosphorusB. NitrogenC. ArsenicD. Bismuth |
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Answer» Correct Answer - B Nitrogen forms `NCl_(3)` which is explosive |
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| 160. |
Which of the following elements will form an acidic oxide ?A. NitrogenB. PhosphorusC. ArsenicD. Antimony |
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Answer» Correct Answer - A Nitrogen form acidic hydride |
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| 161. |
Which one of the following elements does not form the compound, `M_(4)O_(10)` (M = element) ?A. PB. SbC. AsD. Bi |
| Answer» Correct Answer - D | |
| 162. |
Which readily form `p pi-p pi` multiple bonds with itself and with C and O among VA group elements ?A. P, AsB. N, AsC. N, PD. N |
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Answer» Correct Answer - D Nitrogen readilt form `ppi - ppi` multiple bondwith itself and with C and O among VA group elements, 0.3. `N_(3)H`-hydrazoic acid - acidic hydride of nitrgen |
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| 163. |
An element X belongs `I,II,III or V` groups. Its oxide reacts with water to produce highly acidic solution the element X belongs toA. I groupsB. II groupC. III groupD. V group |
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Answer» Correct Answer - D from left to right acidic nature increases |
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| 164. |
Nitrous oxide isA. Soluble in cold waterB. Soluble in hot water without decompositionC. Acidic in natureD. Basic in nature |
| Answer» Correct Answer - A | |
| 165. |
Which readily form `p pi-p pi` multiple bonds with itself and with C and O among VA group elements ?A. oxides of nitrogenB. halides of nitrogenC. oxides of phosphorousD. halides of phosphorous |
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Answer» Correct Answer - A Nitrogen form large number of oxides because of its ability of forming `p pi - p pi` multiple bonds. |
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| 166. |
Which phosphine is bubbled through a solution of silver nitrate, the compound formed is :A. Silver phosphideB. Silver oxideC. SylvineD. Horn silver |
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Answer» Correct Answer - A `3AgNO_(3)+PH_(3) rarr Ag_(3)P + 3HNO_(3)` |
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| 167. |
`N_(2)O_(4)` reacts with water to produceA. `N_(2)O and HNO_(3)`B. `HNO_(3) and N_(2)O_(3)`C. `HNO_(2) and NO`D. `HNO_(2) and HNO_(3)` |
| Answer» Correct Answer - D | |
| 168. |
The tendency of nitrogen halides to act as Lawis bases decreases in the orderA. `NF_(3) gt NBr_(3) gt NCl_(3) gt NI_(3)`B. `NI_(3) gt NBr_(3) gt NCl_(3) gt NF_(3)`C. `NF_(3) gt NCl_(3) gt NBr_(3) = NI_(3)`D. `NCl_(3) gt NBr_(3) gt NF_(3) gt NI_(3)` |
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Answer» Correct Answer - B `NF_(3)` to `NI_(3)`: Lewis basic nature increases |
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| 169. |
The dipoles moment of `NF_(3)` is less than `NH_(3)` becauseA. `NH_(3)` forms associated moleculesB. F is more reactive than HC. The resultant of bond polarity is lessD. The resultant of individual polarities is opposed by the polarity of lone pair in `NF_(3)` |
| Answer» Correct Answer - D | |
| 170. |
Give reason why elemental nitrogen exitsts as diatomic molecule whereas elemental phosphours is a tetraatomic molecule. |
| Answer» Nitrogen atoms are small in size and can approach very close to one another so lateral overlap of p-orbitalsd can takes place to form `pi`-bonds. Phosphorous atoms are larger in size hence lateral overlapping is not possible. So `P_(4)` molecules are formed by single bonds between P atoms. | |
| 171. |
Which of the following statements is not correct ?A. Nitrogen forms triple bonds whereas phosphorous does not exisy (unstable) as P = PB. The N - N (single) bond is stronger than P - P (single bond)C. Red phosphorous is less reactive than white phosphorousD. The catenation capacity of nitrogen is less than phosphorous |
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Answer» Correct Answer - B Phosphorus has high catenation capacity |
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| 172. |
What is the hydrolysis product of hypophosphoric acid ?A. `H_(3)PO_(3),H_(4)P_(2)O_(7)`B. `H_(3)PO_(4)` onlyC. `H_(3)PO_(3)` onlyD. `H_(3)PO_(3),H_(3)PO_(4)` |
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Answer» Correct Answer - D `H_(4)P_(2)O_(6)+H_(2)O rarr H_(3)PO_(3) +H_(0)PO_(4)` |
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| 173. |
Solid `N_(2)O_(5)` consists ofA. Linear `NO_(2)^(+)` and planar `NO_(3)^(-)`B. Nonionic polymeric unitsC. `NO^(+)` and tetrahedral `NO_(4)^(-)`D. Nonionic and diameric units only |
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Answer» Correct Answer - A Solid `N_(2)O_(5): NO_(2)^(+) NO_(3)^(-)` |
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| 174. |
Identify the incorrect statement from the followingA. `N_(2)` is formed when ammonia reacts with excess of `Cl_(2)`B. Ammonia on passing over hot CuO, liberates nitrogen gasC. When chlorine reacts with excess ammonia, nitrogen is liberatedD. `P_(4)O_(10)` is known as phosphoric anhydride |
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Answer» Correct Answer - A `underset(("excess"))(8NH_(3)) +3CI_(2) rarr N_(2)+NH_(4)CI` `NH_(3)+underset(("excess"))(3CI_(2)) rarr NCI_(3) +3HCI` `CuO +NH_(3) rarr Cu +N_(2)+H_(2)O` |
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| 175. |
A diatomic gas will be obtained inA. `Cu+dil. HNO_(3) rarr`B. `(NH_(4))_(2) Cr_(2)O_(7) overset(Heat)(rarr)`C. Both 1 & 2D. `NH_(4)NO_(3) overset (Delta)(rarr)` |
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Answer» Correct Answer - C `3Cu+8HNO_(3)rarr3Cu(NO_(3))_(2)+2NO+4H_(2)O` `(NH_(4))_(2)Cr_(2)O_(7)rarrN_(2)+Cr_(2)O_(3)+4H_(2)O` |
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| 176. |
Which of the following is not correct?A. White and red phosphorus react with chlorine at room temperatureB. White phosphorus is unstable, while red phosphorous is stableC. White phosphorous is lighter than red phosphorusD. White phosphorus is highly poisonous, while red phosphorus is not. |
| Answer» Correct Answer - A | |
| 177. |
Which of the following gas is most soluble in water ?A. COB. `N_(2)O`C. NOD. `NH_(3)` |
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Answer» Correct Answer - D due to H-bond |
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| 178. |
Which of the following is not correct ?A. Hydrolysis of `HCl_(3)` gives `NH_(3) and HOCl`B. `NH_(3)` is less stable than `PH_(3)`C. `NH_(3)` is weak reducing agent compared to `PH_(3)`D. Nitric oxide in solid state exhibits diamagnetic property |
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Answer» Correct Answer - B `NH_(3)` is more stable. Due to H-bond |
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| 179. |
The dipoles moment of `NF_(3)` is less than `NH_(3)` becauseA. `NH_(3)` forms associated moleculesB. F is more reactiven than HC. The resutant of bond polarity is lessD. The resultant of individual polarities is opposed by the polarity of lone pair |
| Answer» Correct Answer - D | |
| 180. |
Mixture of conc. `HNO_(3)` and conc. `H_(2)SO_(4)` is known asA. Sulphonating mixtureB. Nitration mixtureC. Explosion mixtureD. Fusion mixture |
| Answer» Correct Answer - B | |
| 181. |
Ammonia is not a product in theA. Hydrolysis of nitrolimB. Hydrolysis of Aluminium nitrideC. Decomposition of Ammonium nitriteD. Hydrolysis of urea |
| Answer» Correct Answer - C | |
| 182. |
`NH_(3)` on burning in oxygen givesA. `NO and H_(2)O`B. `NO_(2) and H_(2)O`C. `N_(2) and H_(2)O`D. `N_(2)O and H_(2)` |
| Answer» Correct Answer - A | |
| 183. |
Silver chloride dissolves in excess of `NH_4OH`. The cation present in solution is.A. `Ag^(+)`B. `[Ag(NH_(3))_(4)]^(+)`C. `[Ag(NH_(3))_(2)]^(+)`D. `[Ag(NH_(3))_(6)]^(+)` |
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Answer» Correct Answer - C `AgCl+2NH_(4)OH underset("Diammine silver(I) chloride")(rarr[Ag(NH_(3))_(2)]Cl+2H_(2)O)` |
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| 184. |
calcium cyanamide on treatment with steam under pressure gives ammonia andA. Calcium carbonateB. Calcium hydroxideC. Calcium oxideD. Calcium bicarbonate |
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Answer» Correct Answer - A `CaNCN+3H_(2)O rarr CaCO_(3)+2NH_(3)` |
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| 185. |
Which of the following statements is correct?A. All the hydrides of VA group elements are pyramidal in shapeB. The bond angle decreases from `NH_(3)` to `BiH_(3)` down the group because of bond pair-bond pair repulsionC. The basic strength decreases from `NH_(3)` to `BiH_(3)`, because of deceases in the availability of lone pair of electronsD. All are correct |
| Answer» Correct Answer - D | |
| 186. |
Phosphine is not obtained by the reactionA. White P is heated with NaOHB. Red P is heated with NaOHC. `Ca_(3)P_(2)` is heated with waterD. Phosphorus trioxide is boiled with water |
| Answer» Correct Answer - B | |
| 187. |
Which of the following trihalides is not hydrolysedA. `NF_(3)`B. `PCl_(3)`C. `AsCl_(3)`D. `SbCl_(3)` |
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Answer» Correct Answer - A Because `NF_(3)` is a stable halide |
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| 188. |
Treatment of `NH_(3)` with excess of ethyl chloride gives:A. the nitrogen atom of `NH_(3)` gains electronsB. `NH_(3)` can give a pair of electronsC. A proton in HCl can accept an electron pair from `NH_(3)`D. The `Cl^(-)` ions gas a stable configuration of 8 electrons. |
| Answer» Correct Answer - A | |
| 189. |
Which chloride is not appreciably hydrolysed by waterA. `BiCI_(3)`B. `PCI_(3)`C. `AsCI_(3)`D. `SbCI_(3)` |
| Answer» Correct Answer - A::D | |
| 190. |
Which of the following pairs of ions are isoelectronic and isostructural ?A. `CO_(3)^(2-),NO_(3)^(-)`B. `CIO_(3)^(-),CO_(3)^(2-)`C. `SO_(3)^(2-),NO_(3)^(-)`D. `CIO_(3)^(-),SO_(3)^(2-)` |
| Answer» Correct Answer - A | |
| 191. |
When white phosphorous reacts with `NaOH`, it produces a gaseous mixture by the following parallel reaction. `P_(4) +3NaOH +3H_(2)O rarr 3NaH_(2)PO_(2)+PH_(3)uarr` `3P_(4)+8NaOH +8H_(2)O rarr 8NaH_(2)PO_(2)+2P_(2)H_(4)uarr` The correct thermal stability order isA. The lone pair of P is present at 3d orbitalB. the lone pair of P raised at almost pure p orbitalC. the lone pairs of p raised at `sp^(3)` hybrid orbitalD. the lone pair of p raised at almost pure s orbital |
| Answer» Correct Answer - D | |
| 192. |
Nesslers reagent is used to detect trace amounts of ammonia. Its formula isA. `KHgI_(4)`B. `K_(2)HgI_(2)`C. `K_(2)HgI_(4)`D. `KHgI_(3)` |
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Answer» Correct Answer - C with `NH_(3)` gives reddish brown ppt. |
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| 193. |
Assertion `BF_(3)` has greater dipole momnet than `H_(2)S` Reasoning Fluorine is more electronegative than sulphur .A. Both A and R are correct and R is the correct explanation of AB. Both A and R are correct and R is not the correct explanation of AC. A is correct R is wrongD. A is wrong R is correct |
| Answer» Correct Answer - A | |
| 194. |
Valency and oxidation number of nitrogen in `N_(2)O_(5)` |
| Answer» `N_(2)O_(5)` : Contains N-O-N linkage | |
| 195. |
Let us consider the following reaction: `N_(2)O_(5)+NaCI rarr X +Y` (X is a sodium salt) What is the difference in the oxidation sates of nitrogen in the anionic and cationic parts of X and Y? |
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Answer» Correct Answer - B `X=NaNO_(3),Y=NOCl` `N_(2)O_(5)+NaC rarrNaNO_(3)+NOCl` |
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| 196. |
Let us consider the following conversion: `Na + NH_(3) overset("Fe catalyst")rarr (B) +H_(2)` `B overset(N_(2)O)rarr X +NH_(3) +NaOH` In one molecule of X how many atoms of nitrogen are present? |
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Answer» Correct Answer - 3 `B = NaNH_(2), X = NaN_(3)` `NaNH_(2) +N_(2)O rarr NaN_(3)+NH_(3)+NaOH` |
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| 197. |
`A + B underset(Delta)overset(NaOH)rarr` Product :A. (i) `gt` (ii) `gt` (iii)B. (iii) `gt` (ii) `gt` (i)C. (ii) `gt` (i) `gt` (iii)D. (ii) `gt` (iii) `gt` (i) |
| Answer» Correct Answer - B | |
| 198. |
The gas not having oxidizing as well as bleaching properties isA. ChlorineB. OzoneC. `SO_(2)`D. `N_(2)O` |
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Answer» Correct Answer - D `N_(2)O` is not having oxidising and bleaching properties |
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| 199. |
`Na+NH_(3)underset(Delta)overset("Iron catalyst")rarr(A) overset(N_(2)O)rarr(B)overset(Heat)rarrgas(X).` Which of the following is correct ?A. (B) is an amphoteric oxideB. (X) is a colourless, diamagnetic gas which combines with `Al` on heatingC. (X) can be produced by action of (Zn+NaOH) on `NaNO_(2)`D. (X) is coloured, paramagnetic gas which combines with `Al` on heating |
| Answer» Correct Answer - B | |
| 200. |
Assertion (A) : `PH_(3)` is more basic than `NH_(3)` Reason (R) : EN of N is more than that of PA. Both A and R are correct and R is the correct explanation of AB. Both A and R are correct and R is not the correct explanation of AC. A is correct R is wrongD. A is wrong R is correct |
| Answer» Correct Answer - A | |