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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. |
`CaC_(2)+N_(2) to A, "Product A is "`A. `CaCN_(2)`B. `CaCN_(2) and C`C. `CaCN_(2)+N_(2)`D. None of these |
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Answer» Correct Answer - B When calcium carbide reacts with nitrogen at `1000^@C`. calcium cyanide and carbon is formed. `CaC_(2)+N_(2) overset(1000^(@)C)to underset("Calcium cyanide")(CaCN_(2)+C)` |
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| 52. |
An element `(X)` forms compounds of the formuls `XCl_(3),X_(2)O_(5)` and `Ca_(3)X_(2)` , but does not form `XCl_(5)`. Which of the following is the element X ?A. BB. AlC. ND. P |
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Answer» Correct Answer - C `N_2` can form `NCl_(3) N_2O_5 and Ca_(3) N_2` but does not form `NCI_5`. |
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| 53. |
In compounds of type `ECI_(3)`, where `E=BP`, As or `B`, the angles `CI-E-CI` for different `E` are in the orderA. `B gt P= As =Bi`B. `B gt P gt As gt Bi`C. `B lt P=As =Bi`D. `B lt P lt As lt Bi` |
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Answer» Correct Answer - B `B gt P gt As gt Bi` As we go down the group bond angle decreases because repulsion between bonded pairs of electron decreases |
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| 54. |
Which of the following is cinnabar?A. `BaSO_(4)`B. `HgS`C. PbSD. `CaSO_(4)2H_(2)O` |
| Answer» Correct Answer - B | |
| 55. |
An example of tetra atomic molecule isA. white PB. ozoneC. diboraneD. urea |
| Answer» Correct Answer - A | |
| 56. |
Which one of the following elemen does not dissolve in fused or aqueous alkalies?A. BoronB. SiliconC. AluminiumD. None of these |
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Answer» Correct Answer - D Boron dissolved in fused alkalies according to the following reaction. `2B+6NaOHoverset("fused")to2Na_(3)BO_(3)+3H_(2)` Silicon and aluminium dissolved in both fused and aqueous alkalies. |
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| 57. |
Which of the following sompound is obtained on heating potassium ferrocyanide with concentrated `H_(2)SO_(4)`?A. `CO_(2)`B. `CO`C. `C_(2)H_(2)`D. `(CN)_(2)` |
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Answer» Correct Answer - B `K_(4)[Fe(CN)_(6)]+6H_(2)SO_(4)("conc")+6H_(2)Ooverset(Delta)to2K_(2)SO_(4)+FeSO_(4)+3(NH_(4))_(2)SO_(4)+6CO` |
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| 58. |
The dissolution of `Al(OH)_(3)` by a solution of `NaOH` results in the formation ofA. `[Al(H_(2)O)_(4)(OH)]^(2+)`B. `[Al(H_(2)O)_(2)(OH)_(4)]^(-)`C. `[Al(H_(2)O)_(3)(OH)_(3)]`D. `[Al(H_(2)O)_(6)(OH)_(3)]` |
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Answer» Correct Answer - B As `Al(OH)_(3)` is amphoteric in nature and thus form `[Al(H_(2)O)_(2)(OH)_(4)]` |
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| 59. |
Aqueous ammonia is used as a precipitating reagent for `Al^(3+)` ions as `Al(OH)_(3)` rather than aqueous `NaOH`, because:A. `NH_(4)^(+)` is a week baseB. `NaOH` is a very strong baseC. `NaOH` forms soluble `[Al(OH)_(4)]^(-)` ionsD. `NaOH` forms `[Al(OH)_(2)]^(+)` ions |
| Answer» Correct Answer - C | |
| 60. |
With excess of `Cl_2` react with ammonia formsA. `NH_(4)Cl`B. `NCl_(3)`C. `N_(2)`D. NOCl |
| Answer» Correct Answer - B | |
| 61. |
Hydrogen gas is liberated when dil. `H_2SO_4` react withA. CuB. FeC. CD. S |
| Answer» Correct Answer - B | |
| 62. |
Copper react with conc. `H_2SO_4` to givesA. `CuSO_(4)+H_(2)`B. `CuSO_(4)+SO_(2)+H_(2O`C. `CuSO_(4)+S`D. `CuSO_(4)+O_(2)` |
| Answer» Correct Answer - B | |
| 63. |
Liquid ammonia is used to refrigeration because of itsA. It has a high dipole momentB. It has a high heat of vaporisationC. It is basicD. It is a stable compound |
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Answer» Correct Answer - B Liquid ammonia is used in refrigeration because it has high heat of vaporisation. |
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| 64. |
Which of the following is oxidised by `SO_2` ?A. MgB. `K_(2)Cr_(2)O_(7)`C. `KMnO_(6)`D. All |
| Answer» Correct Answer - A | |
| 65. |
Sulphur is oxidised by `H_2SO_4` givesA. `SO_(2)`B. `SO_(3)`C. `SO_(4)`D. `H_(2)SO_(3)` |
| Answer» Correct Answer - A | |
| 66. |
In case of nitrogen, `NCl_(3)` is possible but not `NCI_5` gwhile in case of phosphorous, `PCl_3` as well as `PCI_5` IM are possible. It is due toA. Availability of vacant d-orbital in P but not in NB. Lower electronegativity of P than NC. Occurrence of P in solid while N in gaseous state at room temperatureD. Occurrence of P in solid while N in gaseous PREL T state at room temperature |
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Answer» Correct Answer - A Nitrogen does not have d-orbitals. |
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| 67. |
In solid `PCl_(5)` exist asA. `PCl_(3)`B. `PCl_(4)^(+)`C. `PCl_(6)^(-)`D. `PCl_(4)^(+) and PCl_(6)^(-)` |
| Answer» Correct Answer - D | |
| 68. |
N-N bond is not present inA. `N_(2)O_(3)`B. `N_2O_(4)`C. `N_(2)O_(5)`D. `N_2` |
| Answer» Correct Answer - C | |
| 69. |
`PCl_3` under goes hydrolysis to produce an oxoacid.It has formula In solid PCl, exist asA. `HPO_(3)`B. `H_3PO_(3)`C. `H_(3)PO_(4)`D. `H_(3)PO_2` |
| Answer» Correct Answer - B | |
| 70. |
One of the acid listed below is formed from `P_2O_3`. The rest are formed from `P_2O_5`. The acid formed from hydrolysis isA. `HPO_(3)`B. `H_4P_2O_7`C. `H_(3)PO_(4)`D. `H_(3)PO_(3)` |
| Answer» Correct Answer - D | |
| 71. |
Which of the following is oxidised in air?A. White phosphorusB. `CH_(4)`C. `H_(2)O`D. NaCl |
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Answer» Correct Answer - A `P_(4)+5O_2 to P_4O_10` :white phosphorus gets easily oxidized because it is highly reactive. |
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| 72. |
Which of the following oxide of nitrogen is a coloured gas?A. `N_(2)O`B. NOC. `N_(2)O_(5)`D. `N_(2)O` |
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Answer» Correct Answer - D `NO_(2)` brown coloured gas. |
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| 73. |
In the preparation red phosphorous from white phosphorousA. `MnO_(2)` is used as catalystB. the white phosphorous is treated in electric furnaceC. a little `l_2` is used as catalystD. the gas `P_4` is released |
| Answer» Correct Answer - C | |
| 74. |
Phosphorous acid isA. monobasic acidB. dibasic acidC. tribasic acidD. tetrabasic acid |
| Answer» Correct Answer - B | |
| 75. |
White phosphorous is heated with conc. NaOH in inert atmosphere of `CO_2` givesA. `NH_3`B. `PCl_(3)`C. `PH_(3)`D. `PCl_(5)` |
| Answer» Correct Answer - C | |
| 76. |
`BCl_(3)` does not exist as dimer but `BH_(3)` exist as dimer `(B_(2)H_(6))` because :-A. Chlorine is more electronegative than hydrogenB. There is `p_(pi)-p_(pi)` bonding in `BCl_(3)` but `BH_(3)` does not contain such bondingC. Large sized chlorine atoms do not fit between the small boron atoms whereas smalled sized hydrogen atoms get fitted between boron aotms.D. None of these |
| Answer» Correct Answer - C | |
| 77. |
An oxide of nitrogen exists is equilibrium with its dimer. At low temperature, the oxide exists almost entirely as the pale yellow solid. As temperature is increased, the colour darkens, the dissociation is complete at `150^@C` and the colour of gaseous matter becomes black. Further increase in temperature results in a loss of colour. The oxide of nitrogen isA. `N_(2)O_5`B. `N_2O_4`C. `NO_2`D. NO |
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Answer» Correct Answer - C `underset(("Pale yellow solid"))(N_(2)O_(4)) underset("Cool")overset("Heat")Leftrightarrow 2NO_(2) overset("Heat")Leftrightarrow underset(("Brown or black"))(2NO+O_(2))` |
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| 78. |
Which of the following halogen exist in solid state?A. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)` |
| Answer» Correct Answer - D | |
| 79. |
Which of following is polymeric phosphorous ?A. White PB. Red PC. Black PD. Yellow P |
| Answer» Correct Answer - B | |
| 80. |
Which of the following exist in dimer ?A. `N_(2)O_(5)`B. `N_O_(4)`C. `NO_(2)`D. `N_(2)O_(3)` |
| Answer» Correct Answer - C | |
| 81. |
The small size and high charge of `Al^(3+)` ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in solution, and (c) high lattice energy of its compounds in the solid state. Thus aluminium can forms both covalent and ionic bond. Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium. Actually aluminium atoms complete their octets by forming dimers. Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-solvents like benzene while the corresponding boron halides exists as monomer. In boron trihalides the extent of back bonding decreases with increases with increase in size of halogens and thus lewis acid character increases. All `BX_(3)` are hydrolysed by water but `BF_(3)` shows a different behaviour. Which of the following reaction is incorrect ?A. `BF_(3) (g)+F^(-)(aq) to BF_(4)^(-)`B. `BF_(3) (g)+2H_(2)Oto[BF_(3)OH]^(-)+H_(3)O^(-)`C. `BCl_(3)(g)+3EtOH(l)toB(Oet)_(3)(l)+3HCl`D. `BCl_(3)(g)+2C_(5)H_(5)N(l)toCl_(3)B(C_(5)H_(5)N)_(2)(s)` |
| Answer» Correct Answer - D | |
| 82. |
The small size and high charge of `Al^(3+)` ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in solution, and (c) high lattice energy of its compounds in the solid state. Thus aluminium can forms both covalent and ionic bond. Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium. Actually aluminium atoms complete their octets by forming dimers. Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-solvents like benzene while the corresponding boron halides exists as monomer. In boron trihalides the extent of back bonding decreases with increases with increase in size of halogens and thus lewis acid character increases. All `BX_(3)` are hydrolysed by water but `BF_(3)` shows a different behaviour. The dimeric structure of aluminium chloride disappears when:A. it dissolves in waterB. it reacts with donor molecules like `R_(3)N`C. it dissolves in benzeneD. (A) & (B) both |
| Answer» Correct Answer - D | |
| 83. |
The most powerful oxidizing agent isA. `H_2SO_4`B. `H_2PO_3`C. `H_(3)PO_(4)`D. `HPO_(3)` |
| Answer» Correct Answer - A | |
| 84. |
Ozone is an important constituent of stratosphere because itA. prevents the formation of srnog over large citiesB. remove poisonous gases of the atmosphere by reacting with themC. absorbs ultraviolet radiation, which is harmful to human lifeD. destroys bacteria, which are harmful to human |
| Answer» Correct Answer - C | |
| 85. |
The shape of `SO_2` molecule isA. bentB. linearC. tetrahedralD. plane triangular |
| Answer» Correct Answer - A | |
| 86. |
Metaphosphoric acid has the formulaA. `H_(3)PO_(4)`B. `H_(3)PO_(3)`C. `H_(3)PO_(2)`D. `HPO_(3)` |
| Answer» Correct Answer - D | |
| 87. |
NaOH reacts with white phosphorus to giveA. `PH_(3)`B. `P_(4)O_(10)`C. `P_(4)O_(6)`D. `Na_(2)PO_(4)` |
| Answer» Correct Answer - A | |
| 88. |
Pick out the ideal conditions needed for the manufactor of `H_(2)SO_(4)` by contact process.A. Low temperature, high pressure anid high concentration of reactantsB. Low temperature, low concentration of reactants and low pressureC. High temperature, high pressure and high concentration of reactantsD. Low temperature, low pressure and high concentration of reactants. |
| Answer» Correct Answer - A | |
| 89. |
When liberates `H_(2)` with dil `H_(2)SO_(4)?`A. ZnB. CuC. FeD. S |
| Answer» Correct Answer - C | |
| 90. |
Sulphur in `+3` oxidation state is present inA. Sulphurous acidB. Pyrosulphuric acidC. Dithionous acidD. Tiosulphuric acid |
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Answer» Correct Answer - C Dithionous acid `(H_2S_2O_4)` has sulphur in +3 oxidation state. `HO-overset(O)overset(||)S-overset(O)overset(||)S-OH ,2(+1)+2x +4(-2)=0` `2x=8-2=6, x=+3` |
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| 91. |
Which of the following reactions can be used to prepare metaphosphoric acid ?A. `P_(4)O_(6)+H_(2)O overset(Delta)to`B. `H_(3)PO_(4) overset(600K)to`C. `P+HNO_(3) ("conc")`D. `P_(4)P_(10) to` |
| Answer» Correct Answer - A | |
| 92. |
The shape of `SO_(4)^(2-)` isA. square planarB. trigonal pyramidalC. tetrahedralD. hexagonal |
| Answer» Correct Answer - C | |
| 93. |
Write the missing product in the following reactionA. `2N_(2)O_(5)`B. `2N_(2)O_(3)`C. `2NO_(2)`D. `2N_(2)O` |
| Answer» Correct Answer - A | |
| 94. |
Contact process is used to prepareColloidal sulphurA. `SO_(2)`B. `NH_(3)`C. `H_(2)SO_(4)`D. `O_(3)` |
| Answer» Correct Answer - C | |
| 95. |
`beta`-sulphur is also known asA. prismatic sulphurB. rhombic sulphurC. plastic sulphurD. milk of sulphur |
| Answer» Correct Answer - A | |
| 96. |
In physulphurous acid oxidation state of sulphur isA. only +2B. only +4C. `+2 and +6`D. only +6 |
| Answer» Correct Answer - B | |
| 97. |
Which one of the properties is not shown by `H_(2)SO_(4)` ?A. An acidB. An oxidizing agentC. As a dehydrating agentD. As a reducing agent |
| Answer» Correct Answer - D | |
| 98. |
Which of the following reactions is an example of nitrogen fixation ?A. `2N_(2)O to 2N_2+O_(2)`B. `NH_(3)+H_(2)O to NH_(4)^(+)+OH^(-)`C. `N_(2)+O_(2) to 2NO`D. `2NO_(2)+H_(2)O to HNO_(2)+HNO_(3)` |
| Answer» Correct Answer - C | |
| 99. |
The laughing gas isA. `N_(2)O_(5)`B. `N_(2)O_(3)`C. `NO_(2)`D. `N_(2)O` |
| Answer» Correct Answer - D | |
| 100. |
Which of the following is not react with sulphurA. `F_(2)`B. `Cl_(2)C. `Br_(2)`D. `I_(2)` |
| Answer» Correct Answer - D | |