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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.
| 101. |
Which of the following non-metal possess the atomicity half that of sulphur?A. NitrogenB. oxygenC. PhosphorusD. arsenic |
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Answer» Correct Answer - C Atomcity of phosphorus `(P_(4))` is half of that of sulphur `(S_(8))`. |
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| 102. |
Phosphorus trioxide reacts with hot water to giveA. Phosphours acidB. Metaphosphoric acidC. Orthophosphoric acidD. Orthophosphoric acid and phosphine |
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Answer» Correct Answer - D `P_(4)O_(6)+underset("Hot")(6H_(2)O)to 3H_(3)PO_(4) +PH_(3)` |
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| 103. |
Pyrophosphoric acid can form….series of salts with alkalisA. TwoB. FourC. ThreeD. It cannot from any salt |
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Answer» Correct Answer - A Although `H_(4)P_(2)O_(7)` is tetrabasic but it forms only two series of salts with alkalis. |
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| 104. |
Which one of the following is pyrophosphoric acid ?A. `H_(3)PO_(3)`B. `H_(3)PO_(4)`C. `H_(4)P_(2)O_(6)`D. `H_(4)P_(2)O_(7)` |
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Answer» Correct Answer - D `H_(4)P_(2)O_(7)`is pyrophosphoric acid `H_(3)PO_(3)` is phosphorous acid `H_(3)PO_(4)` is Orthophosphorous acid `H_(4)P_(2)O_(6)` is Hypophosphorus acid. |
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| 105. |
The product formed when `H_3 PO_4` is heated to `600^@C` isA. `P_(2)O_(5) +2H_(2)O`B. `H_(4)P_(2)O_(7)`C. `HPO_(3)`D. `H_(3)PO_(3)` |
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Answer» Correct Answer - C `H_(3)PO_(4) overset(600^(@)C)to underset("metaphosphoric acid")(HPO_(3))+H_(2)O` |
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| 106. |
Which of the following is paramagnetic?A. `NH_(2)OH`B. `N_(2)O_(3)^(-)`C. `NO_(2)`D. `N_(2)H_(6)Cl_(2)` |
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Answer» Correct Answer - C `NO_(2)` is paramagnetic due to the presence of one unpaired electron. |
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| 107. |
The basicity of hypophosphorus acid is ..... |
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Answer» Correct Answer - 1 `H_(3)PO_(2)` has only one replaceable H i.e., OH group and it basicity is 1 |
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| 108. |
The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorus acid isA. ZeroB. twoC. oneD. three |
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Answer» Correct Answer - B Hypophosphorus acid is `H_(3)PO_(2)` with structure. `{:(" H"),(" |"),(" P"),(" / || "),(" H O OH"):}` Two hydrogen atoms are attached to P. |
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| 109. |
Phosphorus is produced is by adding water toA. `P_(4)O_(6)`B. `P_(4)O_(10)`C. `HPO_(3)`D. `Ca_(3)P_(2)` |
| Answer» `Ca_(3)P_(2)+6H_(2)O to 3Ca(OH)_(2) +2PH_(3)` | |
| 110. |
Red phosphorus is less reactive, less volatile and soluble in non-polar solvent than white/yellow phosphorus becauseA. it has red molecular energyB. it has high molecular energyC. it possesses highly polymerised structureD. it forms condesation products |
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Answer» Correct Answer - C Because it has a polymeric structure. |
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| 111. |
Smoke screen is produced by usingA. Calcium carbideB. Calcium phosphideC. Phosphours trisulphideD. Phosphorus trioxide |
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Answer» Correct Answer - B Calcium phosphide is hydrolysed with water to form phosphine which burns to give required smoke |
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| 112. |
Phosphine gas isA. AcidicB. BasicC. NeutralD. An oxidising agent |
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Answer» Correct Answer - B Phosphine is basic due to the presence of lone pair on phosphorus. |
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| 113. |
Which of the following is used to produce smoke screens?A. Sodium chlorideB. Zinc phosphateC. Clacium phosphideD. Calcium fluoride |
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Answer» Correct Answer - C Calcium phosphide gives phosphene one reaction with water, phosphine on coming in contact with air ignites spontaneously to give white dense smoke of `P_(2)O_(5)` |
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| 114. |
Smelling salt isA. `(NH_(4))_(2)SO_(4)`B. `(NH_(4))_(2)SO_(4)`C. `NH_(4)Cl`D. `(NH_(4))_(2)CO_(3)` |
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Answer» Correct Answer - D `(NH_(4))_(2)CO_(3)` is called smelling salt. `NH_(4)Cl` is called sal ammoniac. |
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| 115. |
Which of the following represents Norwegian salt petre?A. `LiNO_(3)`B. `NaNO_(3)`C. `KNO_(3)`D. `Ca(NO_(3))_(2)` |
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Answer» Correct Answer - D Calcium nitrate is Norwegian salt petre. Potassium nitrate is Bengal salt petre. Sodium nitrate is chile salt petre. |
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| 116. |
Nitrozen (i) oxide is produced byA. thermal decomposition of ammonium nitrateB. disproprtionation of `N_(2)O_(4)`C. thermal decomposition f ammonium nitriteD. Interaction of hydroxylamine and nitrous acid. |
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Answer» Correct Answer - A::D `NH_(4)NO_(3) overset(Delta) to N_(2)O +2H_(2)O` `NH_(2)OH + HNO_(2) to N_(2)O +2H_(2)O` |
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| 117. |
Which of the following does not exist?A. `Na_(3)PO_(3)`B. `P(OCH_(3))_(3)`C. `P(OK)_(3)`D. `KH_(2)PO_(3)` |
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Answer» Correct Answer - A::C `H_(3)PO_(3)`, is a dibasic acid, therefore `Na_(3)PO_(3)` or `P(OK)_(3)` does not exist. However, esters of type `P(OCH_(3))_(3)` do exist. |
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| 118. |
Which of the following compounds does not exist?A. `AlCl_(5)`B. `SbCl_(3)`C. `BiCl_(5)`D. `SbCl_(5)` |
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Answer» Correct Answer - C `BiCl_(5)` does not exist. Bi does not show +5 oxidation state due to inert pair effect. |
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| 119. |
Which of the following has maximum complex forming ability with a given metal ion?A. `NH_(3)`B. `PH_(3)`C. `BiH_(3)`D. `SbH_(3)` |
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Answer» Correct Answer - A The lone pair electron density on N in `NH_(3)` is the largest, hence it will have the maximum complex froming ability. |
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| 120. |
Acidic nitrogen hydride isA. `N_(2)H_(4)`B. `N_(3)H`C. `NH_(2)OH`D. `NH_(3)` |
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Answer» Correct Answer - B `HN_(3)` is hydrazoic acid. |
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| 121. |
Which of the following P is most stable?A. RedB. WhiteC. BlackD. All stable |
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Answer» Correct Answer - C Black phosphorus is the most stable form of phosphorus. |
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| 122. |
Which of the following is an electron deficient compound?A. `NH_(3)`B. `PH_(3)`C. `BCl_(3)`D. `AsH_(3)` |
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Answer» Correct Answer - C It has only a sextet of electrons around boron `Cl : underset("..")(Cl) (B) : Cl` |
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| 123. |
Which one is not an ore of phosphorus?A. AzuriteB. ChalorapatieC. phosphoriteD. Fluorapatite |
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Answer» Correct Answer - A Azurite is an ore of copper `2CuCO_(3).Cu(OH)_(2)`. |
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| 124. |
The most stable hydride isA. `NH_(3)`B. `PH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
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Answer» Correct Answer - A Stability of hydrides of group 14 decreases down the group. Thus `NH_(3)` is most stable. |
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| 125. |
Electron affinity of P isA. more than N and AsB. less than N and less than AsC. more than N and less than AsD. equal to N and As |
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Answer» Correct Answer - A Electron affinity, in general decreases down a group. However, electron affinity of P(70) is more than N(0). It is due to the releatively compact 2p-subshell. Thus, electron affinity of P is more than N and As. |
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| 126. |
White phosphorus is generally preserved inA. alcoholB. waterC. Kerosene oilD. ether |
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Answer» Correct Answer - B Because in air, it reacts with `O_(2)` and catches fire |
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| 127. |
The number of unpaired electrons in the ground state electronic configuration of Group 15 elements isA. 2B. 3C. 4D. 5 |
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Answer» Correct Answer - B For example `._(15)P : 1s^(2) 2s^(2) 2p^(6) 3s^(2)3p^(1)._(x)3p^(1) ._(y)3p^(1)._(z)` |
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| 128. |
Which of the following substances is used as fertilizer?A. `CaC_(2)`B. `NaAlO_(2)`C. `Ca(H_(2)PO_(4))_(2).H_(2)O+CaSO_(4)`D. All the above |
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Answer» Correct Answer - C Superphosphate , `Ca(H_(2)PO_(4))_(2).H_(2)O.CaSO_(4)` is used as fertilizer. |
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| 129. |
Phosphide ion has the electronic structure similar to that ofA. Nitride ionB. Fluoride ionC. Sodium ionD. Chaloride ion |
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Answer» Correct Answer - D `P^(3-) (15+3=18)` and `Cl^(-)` (17+1=18) both have 18 electrons each and have same electronic configuration. |
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| 130. |
`BiCl_3` on hydrolysis forms a white precipitate of _____.A. Bismuthio acidB. Bismuth oxychlorideC. Bismuth pentaclorideD. Bismuth hydroxide |
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Answer» Correct Answer - B `BiCl_(3) +H_(2)O to underset("White ppt.")(BiOCl)+2HCl` |
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| 131. |
On hydrolysis with water, the pentaoxides of group 15 elements giveA. Lower oxy ( -ous ) acidB. BasesC. Higher oxy ( -ic) acidD. None of these |
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Answer» Correct Answer - C Example : `P_(2)O_(5) +H_(2)O to underset("Phosphoric acid")(H_(3)PO_(4))` |
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| 132. |
Which of the following compounds is explosive in nature?A. Phosphorus trichlorideB. Nitrogen trichlorideC. Hyponitrous acidD. Nitrosyl chloride |
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Answer» Correct Answer - B `NCl_(3)` is explosive in nature. |
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| 133. |
`SbCl_3` upon hydrolysis yieldsA. `Sb^(3+)`B. `Sb(OH)_(3)`C. `SbO^(+)`D. None of these |
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Answer» Correct Answer - C `SbCl_(3) + HOH to underset((SbO^(+)))(SbOCl^(+))+2HCl` |
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| 134. |
Which one of the following is an explosive?A. `PCl_(3)`B. `SbCl_(3)`C. `NCl_(3)`D. `BiCl_(3)` |
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Answer» Correct Answer - C `NCl_(3)` is an explosive compound. |
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| 135. |
Which of the following statement regarding ozone is incorrectA. The ozone molecule is angular in shapeB. The ozone is resonance structure of two structuresC. The oxygen-oxygen bond length in ozone is equal to that of oxygen moleculeD. Ozone is used as a germicide and disinfectant for air. |
| Answer» Correct Answer - C | |
| 136. |
Which one statement about `SO_2` is incorrectA. It has an angular shapeB. If decolouries potassium permangante solutionC. Two S - O bonds one equalD. It is a deydrating agent |
| Answer» Correct Answer - D | |
| 137. |
Nitrogen shows different oxidation states in the range:A. 0 to +5B. `-` 3 to +5C. `-5` to +3D. `-3` to +3 |
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Answer» Correct Answer - B Nitrogen exhibits all oxidation states from -3 to +5 |
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| 138. |
An example of a natural oxide isA. NOB. `CO_(2)`C. `CaO`D. `ZnO` |
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Answer» Correct Answer - A NO is neutral oxide. |
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| 139. |
The oxide which on dissolving in water turns blue litmus acid?A. `Sb_(2)O_(3)`B. BaOC. `P_(2)O_(5)`D. `As_(2)O_(3)` |
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Answer» Correct Answer - C Because`P_(2)O_(5)` is acidic in nature. |
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| 140. |
The hydrolysis of `NCl_3` by `H_2 O` producesA. NHOH and HOClB. `NH_(2)NH_(2)` and HClC. `NH_(4)OH` and HOClD. `NH_(4)Cl` and HOCl |
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Answer» Correct Answer - C Products of hydrolysis are `NH_(4)OH ` and HOCl. |
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| 141. |
`N_2` forms `NCl_3` whereas `P` can form both `PCl_3` and `PCl_5`. Why ?A. P has low lying 3d - orbitals , which can be used for bonding but N does not have 3d - orbtals in its valence shellB. N atoms is larger than P in sizeC. P is more rective towards Cl than ND. None of these |
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Answer» Correct Answer - A Nitrogen has no d-orbitals in its valence shell. |
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| 142. |
Which of the following acids possesses oxidising, reducing, and complex forming properties ?A. `H_(2)SO_(4)`B. `HNO_(3)`C. `HNO_(2)`D. `HCl` |
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Answer» Correct Answer - C `HNO_(2)` (Nitrous acid) has all these properties. |
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| 143. |
Lightening bolts in the atmosphere cause the formation ofA. `NH_(3)`B. NOC. `NH_(4)OH`D. `NH_(2)OH` |
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Answer» Correct Answer - B `N_(2) +O_(2) overset("Electric spark")to2NO` |
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| 144. |
One mole of calcium phosphine on reaction with excess of water givesA. One mole of phophineB. Two moles of phosphoric acidC. Two moles of phosphineD. One mole of phosphorus oxide |
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Answer» Correct Answer - C `Ca_(3)P_(2)+6H_(2)O to 3Ca(OH)_(2) +underset("(2 mol)")(2PH_(3))` |
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| 145. |
The lightning bolts in the atmosphere causes the formation of nitric oxide.A. NOB. `NH_(3)`C. `NH_(4)OH`D. `NH_(2)OH` |
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Answer» Correct Answer - A `N_(2)+O_(2) overset("Electric spark")hArr 2NO` |
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| 146. |
When a solution of white phosphorus in `CS_2` is poured over saw dust, the latter catches fire spontaneously on blowing air upon it becauseA. `CS_(2)` in inflammableB. `CS_(2)` is voltileC. Igenition temperature of white P is lowD. P is reactive |
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Answer» Correct Answer - C Because ignition temperature of white phosphorus is low and it catches fire on combustion in air. |
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| 147. |
White P is more reactive than `N_2` becauseA. Electronegativity of P is lowB. Ionisation energy of P is lowC. P - P bond is weaker than N=ND. All the above |
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Answer» Correct Answer - C P-P bond has lesser bond dissociation energy than stronger `N-=N` bond |
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| 148. |
Extra pure `N_2` can be obtained by heatingA. `NH_(3)` and CuOB. `NH_(4)NO_(3)`C. `(NH_(4))_(2)Cr_(2)O_7`D. `Ba(NO_(3))_(2)` |
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Answer» Correct Answer - D All statements are correct |
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| 149. |
Which of the following is wrongA. Nitrogen cannot form ` d pi -dpi `bondB. single N-N bond is weaker than the single P-P bondC. `N_(2)O_(4)` has two resonance structures.D. The stability of hydrides increases from `NH_(3)` to `BiH_(3)` |
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Answer» Correct Answer - D Stability of hydrides decreases from `NH_(3)` to `BiH_(3)` |
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| 150. |
Which of the following does not exist?A. `PCl_(5)`B. `PCl_(3)`C. `BiCl_(3)`D. `NCl_(5)` |
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Answer» Correct Answer - D `NCl_(5)` does not exist due to lack of vacant of d-orbitals with nitrogen so no electrons excitation is possible. |
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