InterviewSolution
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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.
| 1. |
Assertion: Nitric oxide is paramagnetic in the liquid and solid states. Reason: Nitric oxide is an odd electron molecule and the gas is paramagnetic.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 |
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Answer» Correct Answer - D NO (nitric oxide) is paramagnetic in gas phase |
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| 2. |
`H_(3)PO_(2)` is the molecular formula of an acid of phosphorus. Its name and basicity respectively areA. Phosphorus acid and twoB. Hypophospheous acid and twoC. Hypophosphorous acid and oneD. Hypophosphoric acid and two |
| Answer» Correct Answer - C | |
| 3. |
In the compounds of the type `POX_3`, P atoms show multiple bonding of the typeA. `p pi - p pi`B. `d pi -d pi`C. `p pi-d pi`D. no multiplem bonding |
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Answer» Correct Answer - C Hybridisation of P is `Sp^(3)s` |
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| 4. |
Maximum `p pi-p pi` back bonding exists inA. 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 |
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Answer» Correct Answer - A Both A and R are correct and R is the correct explanation for A |
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| 5. |
Which of the following molecules(s) is /are having `p pi -dpi` back bondingA. `P_(4)O_(10)`B. `P_(4)O_(6)`C. `N_(2)O_(5)`D. `(CH_(3))_(3)N` |
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Answer» Correct Answer - A `P_(4)O_(10)`-four `p pi- dpi` bonds |
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| 6. |
Which acid is not formed by the action of water on phosphorus pentoxide ?A. `HPO_(3)`B. `H_(4)P_(2)O_(7)`C. `H_(3)PO_(4)`D. `H_(3)PO_(3)` |
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Answer» Correct Answer - D Ans. H3PO3 Reason: Oxidation state should remain same . All compounds except H3PO3 have +5 O.S . |
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| 7. |
In solid state `PCl_(5)` is aA. i,ii,iiiB. i,iii,ivC. i, iiiD. i,ii,iii,iv |
| Answer» Correct Answer - C | |
| 8. |
In solid state `PCl_(5)` exists as ionic solid i.e., `[X]^(+)[Y]^(-)`, shapes of `X^(+) and Y^(-)` are respectivelyA. Tetrahedral, PyramidalB. Tetrahedral, OctahedralC. Octahedral, LinearD. Octahedral, Trigonal bipyramidal |
| Answer» Correct Answer - B | |
| 9. |
The hybrid orbitals used by Phosphorus in the formation of `PCl_(5)` areA. `sp^(3)`B. `sp^(2)`C. `dsp^(2)`D. `sp^(3)d` |
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Answer» Correct Answer - D In `PCl_(5)` P undergoes `SP^(3)d` hydridisation due to absence of d-orbitals |
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| 10. |
The bond energies `("in KJ mole"^(-1))` of P-H, As-H and N-H respectively ?A. 247, 318 and 389B. 247, 389 and 318C. 318, 389 and 247D. 318, 247 and 389 |
| Answer» Correct Answer - D | |
| 11. |
The element which shows large number of allotropes among VIA group elementsA. NB. PC. BiD. Sb |
| Answer» Correct Answer - B | |
| 12. |
The bond energy of `N-=N` in KJ per mole isA. 180B. 945C. 350D. 120 |
| Answer» Correct Answer - B | |
| 13. |
What is the highest oxidation state exhibited by group 17 elements ?A. `+1`B. `+3`C. `-3`D. `+6` |
| Answer» Correct Answer - D | |
| 14. |
In the compound `NCl_(3)`, negative oxidation state is exhibited byA. NitrogenB. ChlorineC. Nitrogen & ChlorineD. Neither nitrogen nor chlorine |
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Answer» Correct Answer - A Nitrogen has greater effective nuclear charge than chlorine |
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| 15. |
Assertion: `PCI_(5)` in aqueous medium is a better oxidant than `NCl_(3)` Reason: Phosphorous has vacant d-orbitals while nitrogen has not.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 |
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Answer» Correct Answer - D `NCl_(3)+H_(2)OrarrNH_(3)+HOCl`, `PCl_(3)+H_(2)OrarrH_(3)PO_(3)+HCl` `NCl_(3)` in aq medium is a better oxidant than `PCl_(3)` |
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| 16. |
`PCI_(5)+H_(2)O rarr X +2HCI`, `X +3H_(2)O rarr Y +_3HCI` X and Y have sameA. shapeB. hybridisation for central atomC. same number of `sigma` bondsD. same number of `pi` bonds |
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Answer» Correct Answer - A::B::D `PCI_(5) +H_(2)O rarrPOCI_(3) +2HCI` `POCI_(3)+3H_(2)O rarr H_(3)PO_(4) +3HCI` `X = POCI_(3), Y = H_(3)PO_(4)` |
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| 17. |
Assertion: In hydrazoic acid oxidation state of nitrogen is `-(1)/(3)` Reason: In hydrazoic acid three nitrogen are attached to one hydrogen atom.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 |
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Answer» Correct Answer - C In hydrazoic acid, one nitrogen is attached to one hydrogen atom |
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| 18. |
Boric acid on heating at `100^@ C`, gives `(X)`. `(X)` on heating at `160^@ C` gives `(Y)` and `(Y)` on heating at red hot gives `(Z)`. Identify `(X),(Y)` and `(Z)`. |
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Answer» Correct Answer - 2 `PCI_(3) +H_(2)O rarr H_(2)PO_(3)+HCI` `H_(3)PO_(3) overset(200^(@)C)rarr H_(3)PO_(4)+PH_(3)` |
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| 19. |
Assertion: Phosphorous acid is a dibasic acid Reason: In phosphorous acid, there are two H-atoms directly attached to phosphorous.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 |
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Answer» Correct Answer - C In phosphorus acid, one H-atom directly attached to phosphorus |
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| 20. |
Among the oxyacids of phosphorous the dibasic acid is |
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Answer» Correct Answer - 4 oxoacid is `H_(4)P_(2)O_(6)` |
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| 21. |
Basicity of orthophosphoric acid isA. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - B | |
| 22. |
Orthophosphoric acid loses water on heating. The reaction sequence is represented as:A. `H_(3)PO_(4) overset(250^(@)C)rarr H_(4)P_(2)O_(7) overset(600^(@)C)rarr HPO_(3)`B. `H_(3)PO_(4)overset(250^(@)C)rarr HPO_(3) overset(600^(@)C)rarr H_(40P_(2)O_(7)`C. `H_(3)PO_(4)overset(250^(@)C)rarr P_(2)O_(5)`D. `H_(3)PO_(4)overset(250^(@))rarr HPO_(3) overset(600^(@)C)rarr H_(4)P_(2)O_(7) overset("red hot")rarr P_(2)O_(5)` |
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Answer» Correct Answer - A `H_(3)PO_(4) overset(250^(@)C)rarr H_(4)P_(2)O_(7) overset(600^(@)C)rarr HPO_(3)overset(Delta)rarr P_(4)O_(10)` |
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| 23. |
The following are some statements about oxyacids of VA group elements i) The salt of Nitric acid contains `NO_(3)` ion ii) The salt of phosphoric acid contains `PO_(4)^(3-)` ion iii) Salt of meta phosphoric acid contains `H_(2)PO_(3)^(-) & HPO_(3)^(2-)` ions The correct combination isA. i and ii are correctB. ii and iii are correctC. all are correctD. only ii is correct |
| Answer» Correct Answer - A | |
| 24. |
Assertion (A) : Ortho phosphoric acid is tribasic acid Reason (R) : Orthophosphoric acid forms three series of salts.A. Both (A) and (R) are true and (R) is the correct explanation of (A)B. Both (A) and (R) are true and (R) is not the correct explanation of (A)C. (A) is true and (R) is falseD. (A) is false but (R) is true |
| Answer» Correct Answer - B | |
| 25. |
The formula of meta phosphoric acid isA. 6B. 5C. 4D. 3 |
| Answer» Correct Answer - B | |
| 26. |
The starting material used for the maufactured of `HNO_(3)` by Ostwalds process isA. Ammonia and `N_(2)O`B. AmmoniaC. Air onlyD. Ammonia and nitrogen |
| Answer» Correct Answer - B | |
| 27. |
Which of the following is used in pyrotechniquesA. `NH_(3)`B. `HNO_(3)`C. `PH_(3)`D. `H_(3)PO_(4)` |
| Answer» Correct Answer - B | |
| 28. |
How do we get pure `N_(2)` gasA. `NH_(3)+NaNO_(2)`B. `NH_(4)Cl+NaNO_(2)`C. `N_(2)O+Cu`D. Heating of `Ba(N_(3))_(2)` |
| Answer» Correct Answer - D | |
| 29. |
Gas obtained by heating a mixture of ammonium chloride and slaked lime isA. `NH_(3)`B. `N_(2)`C. `N_(2)O`D. `NO_(2)` |
| Answer» Correct Answer - A | |
| 30. |
Ammonium nitrate decomposes on heating intoA. `N_(2)`B. `NO_(2)`C. `N_(2)O`D. NO |
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Answer» Correct Answer - C `NH_(4)NO_(3) overset(Delta)(rarr)N_(2)O+2H_(2)O` |
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| 31. |
Which of the following is a cyclic oxoacidA. `H_(4)P_(2)O_(7)`B. `H_(4)P_(2)O_(6)`C. `H_(3)P_(3)O_(9)`D. `H_(5)P_(5)O_(15)` |
| Answer» Correct Answer - C | |
| 32. |
Which of the following would produce cyclic silicon on hydrolysis?A. `NF_(3),PCl_(3)`B. `PF_(3),PCl_(3)`C. `PCl_(3),AsCl_(3)`D. `NF_(3),NCl_(3)` |
| Answer» Correct Answer - C | |
| 33. |
Pickout incorrect statement ?A. Pyrophosphoric acid can be obtained by heating orthophosphorusB. Orthophosphorous can be obtained by reacting `P_(4)O_(6)` with waterC. Orthophosphoric acid can be obtained by reacting `P_(4)O_(10)` with waterD. Metaphosphoric acid is obtained by the dehydration of orthophosphoric acid at `316^(@)C` |
| Answer» Correct Answer - A | |
| 34. |
Which of the following is/are correct statement(s)?A. Phosphine is readily obtained when red phosphorus is reacted with NaOH at room temperatureB. At room temperature `N_(2)O_(3)` dissociates into two neutral oxides of nitrogenC. Hydrolysis product of pyrophosphoric acid is orthophosphoric acidD. Solid `PCl_(5)` and `PBr_(5)` are ionic and exists as `PX_(4)^(+)PX_(6)^(-)` while `PI_(5)` does not exists as such |
| Answer» Correct Answer - C | |
| 35. |
Select the incorrect statementA. `N_(2)O` with sodium metal in liquid ammonia forms sodium azide and nitrogen gas is liberatedB. Ammonia is oxidised to nitrogen by dilute solution of `NaOCl` in presence of glueC. `(NH_(4))_(2)Cr_(2)O_(7)` on heating decomposes to give nitrogen and a green coloured compound.D. CaNCN on hydrolysis produces a white precipitate and a gas which turns filter paper moistened with copper sulphate solution deep blue |
| Answer» Correct Answer - B | |
| 36. |
Which of the following is incorrect ?A. `NO_(2)` is acidic paramagnetic oxideB. NO gas is formed during lightening stateC. `N_(2) O_(4)` is mixed anhydrideD. Heating of ammononium nitrate forms a brown coloured paramagnetoc gas |
| Answer» Correct Answer - D | |
| 37. |
Number of acidic oxides among the following is: (a) `N_(2)O` (b) `NO` (c) `N_(2)O_(3)` (d) `N_(2)O_(4)` (e) `N_(2)O_(5)` (f) `P_(4)O_(6)` (g) `P_(4)O_(10)` (h) `SO_(3)` (i) `B_(2)O_(3)` (j) `CO`A. 4B. 3C. 5D. 6 |
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Answer» Correct Answer - B `NO,NO_(2),O_(2)^(-)`: paramagnetic |
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| 38. |
In which of the following acids, P-P bonds is present?A. Tetrapolyphpshoric acidB. Pyrophosphoric acidC. Hypophosphoric acidD. Polymetaphosphoric acid |
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Answer» Correct Answer - C Tetrapolyphosphoric acid `-H_(6)P_(4)O_(13)-` contain `P-O-P` linkages Hypophosphoric acid `-H_(4)P_(2)O_(6)`- contain P-P linkage Pyrophosphoric acid `-H_(4)P_(2)O_(7)-`contain `P-O-P` linkage Polymethaphosphoric acid `-(HPO_(3))_(n)-` contain `P-O-P` linkage |
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| 39. |
Incorrect statement about `Mn_(2)O_(7)` is :A. If self ionises as `NO^(+)` and `NO_(3)^(-)`B. If is paramagneticC. Substance containing `NO^(+)` is said to be acid and that containing `NO_(3)^(-)` is said to be base in `N_(2)O_(4)`.D. `NO_(2)` dimerises to `N_(2)O_(4)` with disappearance in paramagnetism. |
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Answer» Correct Answer - B `N_(2)O_(4)`-dimagnetic |
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| 40. |
Trisilyamine `(SiH_(3))_(3)` N isA. 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 - B | |
| 41. |
Liquide ammonia is used for refrigeration beacauseA. 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 - B | |
| 42. |
`CaCO_(3)(g) overset(Delta)rarr A (s)+B(g)`, `A(s) +D(s) rarr E(s)+F(g)` `H(s)+H_(2)O` (steam) `rarr CaCO_(3)+X (g)` `H+D` mixture is calledA. susperphate of limeB. thomas slagC. nitrolimD. triple phosphate |
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Answer» Correct Answer - C `CaCO_(3)overset(Delta)rarrCaO +CO_(2)` `CaO +C rarr CaC_(2)+CO` `CaC_(2) +N_(2) rarr CaCN_(2)+C` `CaCN_(2)+H_(2)O rarr NH_(3)+CaCO_(3)` |
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| 43. |
The order of the oxidation state of the phosphorus in `H_(3)PO_(2),H_(3)PO_(4),H_(3)PO_(3) and H_(4)P_(2)O_(6)` isA. `H_(3)PO_(4)`B. `HPO_(3)`C. `H_(4)P_(2)O_(6)`D. `H_(3)PO_(3)` |
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Answer» Correct Answer - B `H_(3)PO_(2):` mono basic acid `HPO_(3):` Glacial phosphoric acid `H_(4)P_(2)O_(7) overset(600^(@)C)rarrHPO_(3)` |
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| 44. |
The order of the oxidation state of the phosphorus in `H_(3)PO_(2),H_(3)PO_(4),H_(3)PO_(3) and H_(4)P_(2)O_(6)` isA. `HPO_(3)`B. `H_(3)PO_(2)`C. `H_(3)PO_(3)`D. `H_(4)P_(2)O_(7)` |
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Answer» Correct Answer - A `H_(3)PO_(2):` mono basic acid `HPO_(3):` Glacial phosphoric acid `H_(4)P_(2)O_(7) overset(600^(@)C)rarrHPO_(3)` |
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| 45. |
Oxidation state of `+1` for phosphorus is found inA. `H_(3)PO_(3)`B. `H_(3)PO_(4)`C. `H_(3)PO_(2)`D. `H_(4)P_(2)O_(7)` |
| Answer» Correct Answer - C | |
| 46. |
Phosphorus has the oxidation state `+3` inA. Orthophosphorus acidB. Orthophosphoric acidC. Pyrophosphoric acidD. Metaphosphoric acid |
| Answer» Correct Answer - A | |
| 47. |
`{:(,"List-1",,"List-2"),("A)",HCl_(3)+H_(2)Orarr,"1)",HOCl),("B)",PCl_(3)+H_(2)Orarr,"2)",H_(3)PO_(3)),("C)",PCl_(5)+H_(2)Orarr,"3)",H_(3)PO_(4)),("D)",PF_(3)+H_(2)Orarr,"4)",H_(3)PO_(2)):}` The correct match isA. `{:("A B C D"),("1 2 3 5"):}`B. `{:("A B C D"),("2 4 2 5"):}`C. `{:("A B C D"),("3 2 1 4"):}`D. `{:("A B C D"),("5 3 2 1"):}` |
| Answer» Correct Answer - A | |
| 48. |
Acid having peroxide linkage in its structure isA. `HNO_(3)`B. `H_(3)PO_(4)`C. `H_(4)P_(2)O_(7)`D. `HNO_(4)` |
| Answer» Correct Answer - D | |
| 49. |
Which of the following oxide/oxy-anions does not contain `P-O-P` linkage?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 - B | |
| 50. |
The salts of phosphorous acid are calledA. PhosphatesB. PhosphitesC. HypophosphitesD. Phosphides |
| Answer» Correct Answer - B | |