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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.
| 51. |
`{:(,"List-I",,"List-II"),("A)","HNO"_(3),"1)","-3,+5 oxidation state"),("B)","NH"_(4)"NO"_(3),"2)","-1/3 oxidation state"),("C)","N"_(3)"H","3)","+5 oxidation state"),("D)","H"_(3)"PO"_(3),"4)","+3 oxidation state"),(,,"5)","+ 1/3 oxidation state"):}` The correct match isA. `{:("A B C D"),("3 1 2 4"):}`B. `{:("A B C D"),("5 2 3 4"):}`C. `{:("A B C D"),("1 2 3 4"):}`D. `{:("A B C D"),("4 3 2 5"):}` |
| Answer» Correct Answer - A | |
| 52. |
Which contains O-O linkage ?A. `H_(3)PO_(3)`B. `H_(4)P_(2)O_(7)`C. `H_(4)P_(2)O_(6)`D. `H_(3)PO_(5)` |
| Answer» Correct Answer - D | |
| 53. |
Oxidation state of `+3` for phosphorous 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 - A | |
| 54. |
Phosphorous has the oxidation state of +1 in:A. `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 | |
| 55. |
Phosphorous forms a number of oxoacids which differ in their structures and oxidation state of phosphorous. Each of them has at least one `P = O` or `P rarr O` unit and one P-OH units. The OH group is ionisable but H atom linked directly to P is nonionisable. structures of all the acids are considered to be derived from phosphorous acid or phosphoric acid. The number of `P-H, P rarr O` or `P = O` & `P-O-H` bonds in orthophosphoric acid are respectively:A. 0,3,1B. 1,2,2C. 2,1,2D. 0,1,3 |
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Answer» Correct Answer - D Orthophosphoric acid: `H_(3)PO_(4)` Hypophosphoric acid: `H_(4)P_(2)O_(6)` |
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| 56. |
Phosphorus forms a number of oxoacids which differ in their structures and oxidation state of phosphorus. All the acids contain phosphorus atom//atoms linked tetrahedrally to four other atoms or groups. Each of them has at least one `P=O` or `P rarr O` unit and one `P-OH` unit. The `OH` group is ionisable but `H` atom linked directly to `P` is non-ionisabl. Structures of all the acids are considered to be derived either from phosphorus acid or phosphoric acid. Which of the following is a cycle oxoacid ?A. `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_(9)` |
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Answer» Correct Answer - C Orthophosphoric acid: `H_(3)PO_(4)` Hypophosphoric acid: `H_(4)P_(2)O_(6)` |
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| 57. |
Which of the following metal Fe, Zn, Pb, Ag and Pt do not give a metal nitrate on treatment with concentrated `HNO_3`?A. `Fe`B. `Pt`C. `Pb`D. `Ag` |
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Answer» Correct Answer - A::B Noble metels |
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| 58. |
The neutral oxide 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 | |
| 59. |
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 gas mixture comes out and catches fire immediately due the presence ofA. `PH_(3)`B. `P_(2)H_(4)`C. `P_(2)H_(6)`D. `H_(2)` |
| Answer» Correct Answer - B | |
| 60. |
The State of hybridisation of phosphorus (Z=15) in phosphate ion `(PO_(4)^(3-))` is the same asA. 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 orthophosphates, phosphorus is in `sp^(3)` hybridised state |
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| 61. |
Teeth and bons are made of mainlyA. Calium silicateB. Calcium phosphateC. Calcium silicon phosphateD. Calcium hydrogen phosphate |
| Answer» Correct Answer - B | |
| 62. |
Nitrozen (i) oxide is produced byA. thermal decomposition of sodium nitrite at low temperatureB. thermal decomposition of ammonium nitriteC. disproportionation of `N_(2)O_(4)`D. interaction of hydroxyl amine with nitroous acid |
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Answer» Correct Answer - D `NH_(2)OH + HNO_(2) rarr N_(2)O + H_(2)O` |
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| 63. |
Nitrozen (i) oxide is produced byA. Thermal decomposition of Ammonia NitrateB. Decomposition of `NO_(2)`C. By the decomposition of `NaNO_(2)`D. By the interaction of Hydroxyl amine and Nitrous acid |
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Answer» Correct Answer - A `NH_(4)NO_(3)rarrN_(2)O+2H_(2)O` (nitrogen in `N_(2)O` gas `+` oxidation state) |
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| 64. |
Correctly matched :A. `{:(,"P = O","P - OH","P - H"),(,"bonds","bonds","bonds"),("H"_(3)"PO"_(3),1,3,0):}`B. `{:(,"P = O","P - OH","P - H"),(,"bonds","bonds","bonds"),("H"_(4)"P"_(2)"O"_(6),2,4,1):}`C. `{:(,"P = O","P - OH","P - H"),(,"bonds","bonds","bonds"),("H"_(3)"PO"_(2),1,1,2):}`D. `{:(,"P = O","P - OH","P - H"),(,"bonds","bonds","bonds"),("H"_(4)"P"_(2)"O"_(7),2,2,0):}` |
| Answer» Correct Answer - C | |
| 65. |
Which of the following is true about prionsA. Hydrolysis of urea does not give ammoniaB. Moist ammonia can not be dried by CaOC. In Haber process, Fe catalyst is promoted by small amounts of a mixture of `K_(2)O and Al_(2)O_(3)`D. In the cyananmide process, nitrolium mixture is formed. Nitrolium is a mixture of calcium cyanide and graphite |
| Answer» Correct Answer - C | |
| 66. |
Incorrect statements abouti cyclotrimetaphosphoric acid are (i) six `pi` bonds (ii) three `pi` bonds (iii) absence of P - O - P bonds[ (iv) absence of P - P bonds (v) Three P - H bondsA. i,iii,vB. i,iv,vC. ii,iii,ivD. i,iii,iv |
| Answer» Correct Answer - A | |
| 67. |
Which of the following is an acidA. `Ca(OH)_(2)`B. `P(OH)_(3)`C. `NH_(4)OH`D. NaOH |
| Answer» Correct Answer - B | |
| 68. |
Assertion: `Na_(2)HPO_(3)` is an acidic salt Reason: An acidic salt contains an ionisable proton.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 `Na_(2)HPO_(3):` normal salt |
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| 69. |
The oxyacid of phosphorous which has more non-ionisable hydrogensA. `H_(3)PO_(2)`B. `H_(3)PO_(3)`C. `H_(4)P_(2)O_(7)`D. `H_(4)P_(2)O_(6)` |
| Answer» Correct Answer - A | |
| 70. |
The oxyacid of phosphorous which has more non-ionisable hydrogensA. `H_(3)PO_(2)`B. `H_(3)PO_(3)`C. `H_(3)PO_(4)`D. `H_(3)PO_(5)` |
| Answer» Correct Answer - A | |
| 71. |
With reference to protonic acids, which of the following statements is correctA. `PH_(3)` is more basic than `NH_(3)`B. `PH_(3)` is less basic than `NH_(3)`C. `PH_(3)` is equally basic as `NH_(3)`D. `PH_(3)` is amphoteric while `NH_(3)` is basic |
| Answer» Correct Answer - B | |
| 72. |
Which of the following undergoes Hydrolysis most easily:A. `NCl_(3)`B. `PCl_(3)`C. `AsCl_(3)`D. `BiCl_(3)` |
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Answer» Correct Answer - A `NCl_(3)` undergoes hydrolysis easily |
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| 73. |
The geometry with respect ot the central atom of the following molecules are `N(SiH_(3))_(3), Me_(3)N , (SiH_(3))_(3) P`A. planar,pyramidal,pyramidalB. pyramidal,planar,pyramidalC. planar,pyramidal,planarD. planar,planar,planar |
| Answer» Correct Answer - A | |
| 74. |
The laughing gas isA. Nitrous oxideB. Nitric oxideC. Nitrogen oxideD. Nitrogen pentoxide |
| Answer» Correct Answer - A | |
| 75. |
Which of the following pairs produce same gas?A. `NH_(4)NO_(3)` on heating and `Hg(NO_(3))_(2)` on heatingB. `NH_(4)CI` on heating and `CaCN_(2)+H_(2)o`C. `Ca_(3)N_(2)+` dilute `HCI` and `NH_(4)NO_(2)` on heatingD. `(NH_(4))_(2) Cr_(2)O_(7)` on heating and `NH_(4)NO_(2)` on heating |
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Answer» Correct Answer - B::D `Ca_(3)N_(2) +6HCI rarr 3CaCI_(2) + 2NH_(3)` `NH_(4)NO_(2) overset(Delta)rarr N_(2)+2H_(2)O` `(NH_(4))_(2) Cr_(2)O_(7) overset(Delta)rarr N_(2)+Cr_(2)O_(3)+4H_(2)O` `NH_(4)NO_(3) overset(Delta)rarr N_(2)O +2H_(2)O` |
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| 76. |
Match the following : `{:(,"Column-I",,"Column-II"),("a)","Laughing gas","p)",H_(2)N_(2)O_(2)),("b)","Anhydride of nitric acid","q)",N_(2)O_(3)),("c)","Anhydride of nitrous acid","r)",N_(2)O_(5)),("d)","Hyponitrous acid","s)",N_(2)O),(,,"t)",HNO_(2)):}` ltbgt The correct match isA. `{:("A B C D"),("s r q p"):}`B. `{:("A B C D"),("s q r p"):}`C. `{:("A B C D"),("s r p q"):}`D. `{:("A B C D"),("q p r s"):}` |
| Answer» Correct Answer - A | |
| 77. |
Match each of the reactions given in Column I with the corresponding product(s) given in Column II . |
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Answer» Correct Answer - a-ps ; b-qs ; c-rt ; d-qt `Cu + dil HNO_(3) rarr NO +Cu (NO_(3))_(2) +H_(2)O` `Cu + "conc" HNO_(3) rarr NO_(2) +Cu (NO_(3))_(2) +H_(2)O` `Zn + dil HNO_(3) rarr N_(2)O +Zn (NO_(3))_(2)+H_(2)O` `Zn + "conc" HNO_(3) rarr NO_(2) +Zn (NO_(3))_(2) +H_(2)O` |
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| 78. |
`C_(6)H_(5)Br overset(Mg)rarr X overset(CH_(3)I)rarr Y` The product Y isA. `K_(2)Cr_(2)O_(7)`B. `NH_(4)NO_(3)`C. `NH_(4)NO_(2)`D. `(NH_(4))_(2)Cr_(2)O_(7)` |
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Answer» Correct Answer - D `(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)(rarr)N_(2)+Cr_(2)O_(3)+H_(2)O` `(NH_(4))_(2)Cr_(2)O_(7)+NaCl+Conc H_(2)SO_(4) overset(Delta)(rarr)` `CrO_(2)Cl_(2) uarr overset(NaOH)(rarr)Na_(2)CrO_(4)` `N_(2)+Mgoverset(Delta)(rarr)Mg_(3)N_(2) overset(H_(2)O)(rarr)NH_(3)` `H_(2)O`+anhydrous `CuSO_(4)rarr` Blue vitriol. |
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| 79. |
What is compound Z? `CH_(3)CH_(2)CH_(2)Br overset(NaCN)rarr X overset(H_(3)O^(+))underset("heat")rarr Y overset(CH_(3)CH_(2)OH)underset(H^(+))rarr Z`A. `Mg_(3)N_(2)`B. `NH_(3)`C. `MgO`D. `Mg(NO_(3))_(2)` |
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Answer» Correct Answer - A `(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)(rarr)N_(2)+Cr_(2)O_(3)+H_(2)O` `(NH_(4))_(2)Cr_(2)O_(7)+NaCl+Conc H_(2)SO_(4) overset(Delta)(rarr)` `CrO_(2)Cl_(2) uarr overset(NaOH)(rarr)Na_(2)CrO_(4)` `N_(2)+Mgoverset(Delta)(rarr)Mg_(3)N_(2) overset(H_(2)O)(rarr)NH_(3)` `H_(2)O`+anhydrous `CuSO_(4)rarr` Blue vitriol. |
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| 80. |
The pronounced change from non-metallic to metallic behaviour and also increase in the basic nature of oxides from nitrogen to bismuth in group 15 is principally due to increasing size of the atom. The ionisation potential of nitrogen is very high on account of it small size. however, ionisation potential decreases regularly on desceding the group. Which one of the following fluorides does not exist?A. `NF_(5)`B. `AsF_(5)`C. `SbF_(5)`D. `PF_(5)` |
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Answer» Correct Answer - A `NH_(3)` to `BiH_(3)` : Thermal stability decreases `N_(2)O_(3)` to `Bi_(2)O_(3)` : Acidic nature of oxides decrease `NF_(5)` : does not exists due to lack of empty d-orbitals in the valence shell of nitrogen `NH_(3)` to `BiH_(3)` : Lewis basic nature decreases |
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| 81. |
The pronounced change from non-metallic to metallic behaviour and also increase in the basic nature of oxides from nitrogen to bismuth in group 15 is principally due to increasing size of the atom. The ionisation potential of nitrogen is very high on account of it small size. however, ionisation potential decreases regularly on desceding the group. The most unstable hydride is:A. `SbH_(3)`B. `BiH_(3)`C. `PH_(3)`D. `NH_(3)` |
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Answer» Correct Answer - B `NH_(3)` to `BiH_(3)` : Thermal stability decreases `N_(2)O_(3)` to `Bi_(2)O_(3)` : Acidic nature of oxides decrease `NF_(5)` : does not exists due to lack of empty d-orbitals in the valence shell of nitrogen `NH_(3)` to `BiH_(3)` : Lewis basic nature decreases |
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| 82. |
The pronounced change from non-metallic to metallic behaviour and also increase in the basic nature of oxides from nitrogen to bismuth in group 15 is principally due to increasing size of the atom. The ionisation potential of nitrogen is very high on account of it small size. however, ionisation potential decreases regularly on desceding the group. Which one of the following oxides is most acidic?A. `Bi_(2)O_(3)`B. `Sb_(2)O_(3)`C. `As_(2)O_(3)`D. `P_(2)O_(3)` |
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Answer» Correct Answer - D `NH_(3)` to `BiH_(3)` : Thermal stability decreases `N_(2)O_(3)` to `Bi_(2)O_(3)` : Acidic nature of oxides decrease `NF_(5)` : does not exists due to lack of empty d-orbitals in the valence shell of nitrogen `NH_(3)` to `BiH_(3)` : Lewis basic nature decreases |
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| 83. |
The pronounced change from non-metallic to metallic behaviour and also increase in the basic nature of oxides from nitrogen to bismuth in group 15 is principally due to increasing size of the atom. The ionisation potential of nitrogen is very high on account of it small size. however, ionisation potential decreases regularly on desceding the group. Which one of the following is a strongest base?A. `AsH_(3)`B. `SbH_(3)`C. `PH_(3)`D. `NH_(3)` |
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Answer» Correct Answer - D `NH_(3)` to `BiH_(3)` : Thermal stability decreases `N_(2)O_(3)` to `Bi_(2)O_(3)` : Acidic nature of oxides decrease `NF_(5)` : does not exists due to lack of empty d-orbitals in the valence shell of nitrogen `NH_(3)` to `BiH_(3)` : Lewis basic nature decreases |
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| 84. |
Real gases show deviation from ideal behaviour at low temperature and high pressure.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 | |
| 85. |
Which of the following statements are true about `P_(4)O_(6)` and `P_(4)O_(10)`?A. Both these oxides have a closed cage like structuresB. Each oxide requires 6 water molecules for complete hydrolysis to form their respective oxo acids.C. both these oxides contain 12 equivalent `P-O` bondsD. `P_(4)O_(6)` and `P_(4)O_(10)` both contains `p pi-d pi` bonds |
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Answer» Correct Answer - A::B::C `P_(4)O_(6)` does not contain `p pi - d pi` bonds |
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| 86. |
Which is true about `N_(2)O_(5)`?A. It is anhydride of `HNO_(3)`B. In solid state it exists as `NO_(2)^(+)NO_(3)^(-)`C. It is structurally similar to `P_(2)O_(5)`D. It can be prepared by heating `HNO_(3)` over `P_(2)O_(5)` |
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Answer» Correct Answer - A::B::D `N_(2)O_(5)` and `P_(2)O_(5)` have different structures |
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| 87. |
Due to which one of the following 'vortex rings' are formed?A. `PH_(3)`B. `P_(2)H_(4)`C. `N_(2)O`D. `NO_(2)` |
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Answer» Correct Answer - B Generally `PH_(3)` is associated with tracess of `P_(2)H_(4)` (phosphorus dihydride). `P_(2)H_(4)` catches fire spontaneously forming rings of smale known as ' vortex rings'. `(P_(2)H_(4)` is highly inflamable) `(2P_(2)H_(4)+7O_(2)rarr 4HPO_(3)+2H_(2)O)` |
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| 88. |
`PCl_(3)` is an electrical conductor in its aqueous solution. Explain |
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Answer» `PCl_(3)` hydrolysis in moisture (in water) giving the fumes of `HCl` `PCl_(3)+H_(2)OrarrH_(3)PO_(3)+3HCl` In aqueous solutions, `HCl` ionises and it therefore act as an electrical conductor. |
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| 89. |
All five bonds of `PCl_(5)` are not equilvalent and `PCl_(5)` is less stable. Explain. |
| Answer» `PCl_(5)` has a trigonal bipyramidal structure and the three equatroial `P-Cl` bonds are equivalent, while the two axial bonds suffer more repulsions as compared to the equatorial bonds. Hence, `PCl_(5)` is less stable. | |
| 90. |
Complete the following. `HNO_(3)+P_(4)O_(10)to` |
| Answer» `P_(4)O_(10)+6H_(2)Orarr4H_(3)PO_(4)` | |
| 91. |
The number of hydroxyl group in pyrophosphoric acid is |
| Answer» Pyrophosphoric acid : `H_(4)P_(2)O_(7)` (contains 4 P - OH linkages) | |
| 92. |
Among `NCl,PF_(5) and NF_(5) why NF_(5)` is impossible ?A. N has high electronegativityB. N has high ionisation energyC. N has lowest atomic sizeD. N has no vacant d-orbital |
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Answer» Correct Answer - D excitation is not possible |
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| 93. |
Which of the following statements is incorrect?A. Due to hydrogen bonds, `H_(3)PO_(4)` is a viscous liquidB. `H_(3)PO_(4)` cannot react with ammonium molyb dateC. On igniting a mixture of `H_(3)PO_(4),NH_(4)CI` and magnesium salt, `MgNH_(4)PO_(4)` (white ppt) is obtained.D. Orthophsophoric acid on heating with `POCI_(3)` gives polymetaphosphoric acid |
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Answer» Correct Answer - B::C::D `H_(3)PO_(4)` can react with ammonium molybdate |
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| 94. |
Calculate the EAN of central atom in the following complexes `(a) [Fe(CO)_(2)(NO)_(2)] " " (b) [Fe(C_(5)H_(5))_(2)]`A. `[Fe(CO)_(3)(NO)_(2)]`B. `[Fe(CO)_(3)(NO)_(3)]`C. `[Fe(NO)_(5)]`D. `[Fe(CO)_(2)(NO)_(2)]` |
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Answer» Correct Answer - D `[Fe(CO)_(5)] +2 NO rarr [Fe(CO)_(2)(NO)_(2)] + 3CO` |
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| 95. |
One of the acid listed below is formed `P_(2)O-(3)` and the rest are formed from `P_(2)O_(5)`. The acid formed from phosphorus `(III)` pxide isA. `HPO_(3)`B. `H_(4)P_(2)O_(7)`C. `H_(3)PO_(4)`D. `H_(3)PO_(3)` |
| Answer» Correct Answer - D | |
| 96. |
`P_(4)O_(10)` is the anhydride of the followingA. `H_(3)PO_(2)`B. `H_(3)PO_(3)`C. `H_(3)PO_(4)`D. `H_(3)PO_(5)` |
| Answer» Correct Answer - C | |
| 97. |
Which of the following is not an acidic salt ?A. `NaH_(2)PI`B. `NaH_(2)PO_(3)`C. `NaH_(2)PO_(4)`D. `Na_(2)HPO_(4)` |
| Answer» Correct Answer - A | |
| 98. |
The reducing strength of oxyacid of the Phosphorous depends onA. The number of H-atoms directly attached to PB. The number of H-atoms attached to oxygen atomC. The number of O-atoms attached to P-atomsD. The number of P-atoms |
| Answer» Correct Answer - A | |
| 99. |
In `H_(3)PO_(3)` moleculeA. P-atom is surrounded by three -OH groupsB. P-atom is tetrahedrally surrounded b two -OH groups, one oxygen atom and onee hydrogen atomC. P-atom is surounded by four -OH groupsD. P-atom is surrounded by two -H atoms |
| Answer» Correct Answer - B | |
| 100. |
The following are some statements about `HNO_(2)` I) Its undissociated forms are tautomers II) Its undissociated forms are resonance structures III) Its anhydride in pure state exists as pale blue solid and that melts to deep blue liquid The correct combination isA. All are correctB. I, III are correctC. II, III are correctD. I,II are correct |
| Answer» Correct Answer - B | |