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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. |
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 | |
| 102. |
`HNO_(3)+P_(4)O_(10) to HPO_(3) + X` in the above reaction the product `X` is :A. `N_(2)O_(5)`B. `N_(2)O_(3)`C. `NO_(2)`D. `H_(2)O` |
| Answer» Correct Answer - A | |
| 103. |
Iron is rendered passive by treatment withA. aquaregiaB. conc. `H_(2)SO_(4)`C. conc. `HNO_(3)`D. conc. `HCl` |
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Answer» Correct Answer - C `Fe,Cr,Al` forms a protective passive layer |
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| 104. |
Which of the following is rendered passive by conc. `HNO_(3)` isA. AlB. AuC. ZnD. Sn |
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Answer» Correct Answer - A Al rendered passive on treatment with Con `HNO_(3)` |
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| 105. |
Consider the following sequence of reaction and identify the final product (Z). `CH_(3)CH_(2)CH_(2)Br overset("Mg dry ether")rarr (X) overset(CO_(2))rarr (Y) overset(H^(+))rarr(Z)`A. `CrO_(5)`B. `NH_(4)OH`C. `Cr_(2)O_(3)`D. `Fe(OH)_(2)` |
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Answer» Correct Answer - C `(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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| 106. |
Which of the following act both as oxidant & reductant :-A. `H_(2)N_(2)O_(2)`B. `HNO_(2)`C. `HNO_(2)`D. `HNO_(4)` |
| Answer» Correct Answer - B | |
| 107. |
`NH_(3)+O_(2)overset("Pt")to(A)` `(A)+O_(2)to (B)`(brown fumes) `(B)+H_(2)o to ( C)`(nitrogen in lower oxidation state) `+(D)`(nitrogen in higher oxidation state) `( C)` and `(D)` both are oxoacids of nitrogen. `( C)+I^(-)to (E)` (violets vapours). Identify `(A),(B),( C),(D)` and `(E)`A. Both B and E are paramagneticB. E is also a brown coloured vapourC. B is paramagnetic and E is diamagneticD. Both B and E undergoes disproportionation in aqueous solution |
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Answer» Correct Answer - C `A=NO,B=NO_(2),C = HNO_(2),D=HNO_(3),E=I_(2)` |
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| 108. |
Boiling/melting points of the following hydrides follow in order.A. `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)`B. `SbH_(3) gt AsH_(3) gt PH_(3) gt NH_(3)`C. `PH_(3) gt NH_(3) gt AsH_(3) gt SbH_(3)`D. `SbH_(3) gt NH_(3) gt AsH_(3) gt PH_(3)` |
| Answer» Correct Answer - D | |
| 109. |
The structure of phosphide ion is smaller to that ofA. Nitride ionB. Chloride ionC. Fluride ionD. Sodium ion |
| Answer» Correct Answer - B | |
| 110. |
The element having the higher boiling point isA. PB. AsC. SbD. Bi |
| Answer» Correct Answer - D | |
| 111. |
`NH_(4)Cl` on heating with NaOH liberatesA. `NaCl`B. `NH_(3)`C. `HCl`D. `NaOCl` |
| Answer» Correct Answer - B | |
| 112. |
A metalloid of nitrogen family isA. NB. AsC. PD. Bi |
| Answer» Correct Answer - B | |
| 113. |
Superphosphate of lime is obtained by treatingA. Calcium phosphate with HClB. Calcium phosphide with HClC. Calcium phosphate with `H_(2)SO_(4)`D. Calcium phosphate with NaOH |
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Answer» Correct Answer - C `Ca_(3)(PO_(4))_(2)+2H_(2)SO_(4)+4H_(2)Orarr` `Ca(H_(2)PO_(4))_(2)+2(CaSO_(4).2H_(2)O)` |
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| 114. |
Superphosphate is a mixture ofA. `Ca(H_(2)PO_(4))_(2)H_(2)O+CaCl_(2) 2H_(2)O`B. `Ca(H_(2)PO_(4))_(2)+2(CaSO_(4).2H_(2)O)`C. `Ca_(3)(PO_(4))_(2)H_(2)O+2CaSO_(4) 2H_(2)O`D. `Ca_(3)(PO_(4))_(2) H_(2)O+CaCl_(2) 2H_(2)O` |
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Answer» Correct Answer - B Ca,dihydrogen phosphate and Gypsum |
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| 115. |
Ammonia gas is dried byA. Quick limeB. conc. `H_(2)SO_(4)`C. `P_(2)O_(5)`D. `CaCl_(2)` |
| Answer» Correct Answer - A | |
| 116. |
Which of the following elements can form both ionic and covalent bonds ?A. Liquid ammoniaB. `H_(2)O`C. BenzeneD. `C Cl_(4)` |
| Answer» Correct Answer - A | |
| 117. |
Superphosphate of lime isA. Calcium containing substanceB. Soluble in waterC. Containing gypsumD. None of these |
| Answer» Correct Answer - B | |
| 118. |
Fixation of nitrogen meansA. reaction of nitrogen with oxygenB. conversion of free atmospheric nitrogen into nitrogen compoundsC. the action of denitrifying bacteria on nitrogen compoundsD. decomposition of nitrogenous compounds to yield free nitrogen |
| Answer» Correct Answer - B | |
| 119. |
Which one of the following statements is correct with respect to basic character?A. `PH_(3) gt P(CH_(3))_(3)`B. `PH_(3)=NH_(3)`C. `PH_(3) gt NH_(3)`D. `P(CH_(3))_(3) gt PH_(3)` |
| Answer» Correct Answer - D | |
| 120. |
Which of the following is used to produce smoke screens?A. Zinc sulphideB. Calcium phosphideC. Zinc phosphateD. Sodium carbonate |
| Answer» Correct Answer - B | |
| 121. |
Identify the correct sequencing of hydrides based on the parameters specified in bracket:A. `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)` (bond angle)B. `SbH_(3) gt NH_(3) gt AsH_(3) gt PH_(3)` (boiling point)C. `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)` (dipole moment)D. `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3)` (Lewis basic nature) |
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Answer» Correct Answer - A::B::C::D `{:(NH_(3),PH_(3),AsH_(3),SbH_(3)),(107^(@),93.7^(@),91.8^(@),91.3^(@)("bond angle")),(1.46D,0.55D,0.22D,0.1D("dipole moment")),(SbH_(3),NH_(3),AsH_(3),PH_(3)),(-18^(@)C,-33^(@)C,-62^(@)C,-88^(@)C("boiling point")):}` |
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| 122. |
In which of the following reaction(s) one or more than one product is acidic in nature?A. `NCI_(3) +3H_(2)O rarr`B. `CaCNCN +3H_(2)O rarr`C. `KNO_(3)+K rarr`D. `2NH_(3)+NaOCI overset("Gelatin")rarr` |
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Answer» Correct Answer - A::C `NCI_(3)+3H_(2)O rarr NH_(3)+3HOCI` `CaNCN + 3H_(2)O rarr CaCO_(3)+2NH_(3)` `KNO_(3)+K rarr K_(2)O +NO_(2)` `2NH_(3)+NaOCI overset("Gelatin")rarr N_(2)H_(4)+NaCI +H_(2)O` |
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| 123. |
Action of concentrated nitric acid `(HNO_(3))` on metallic tin producesA. 8B. 10C. 6D. 4 |
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Answer» Correct Answer - B `4Zn+10HNO_(3)rarr4Zn(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O` `I_(2)+10HNO_(3)rarr2HIO_(3)+10NO_(2)+4H_(2)O` `3Pt+4HNO_(3)+18 HClrarr3H_(2)[PtCl_(6)]+4NO+8H_(2)O` |
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| 124. |
Which fo the following metal is rendered passive by the action of highly concentrated nitric acid (~80%)?A. 5B. 2C. 6D. 10 |
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Answer» Correct Answer - D `4Zn+10HNO_(3)rarr4Zn(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O` `I_(2)+10HNO_(3)rarr2HIO_(3)+10NO_(2)+4H_(2)O` `3Pt+4HNO_(3)+18 HClrarr3H_(2)[PtCl_(6)]+4NO+8H_(2)O` |
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| 125. |
The outer electronic configuration of group VA elements isA. `"ns"^(2) "np"^(2)`B. `"ns"^(2) "np"^(3)`C. `"ns"^(2) "np"^(4)`D. `"ns"^(2) "np"^(5)` |
| Answer» Correct Answer - B | |
| 126. |
VA group elements are known asA. HalogensB. Normal elementsC. ChalcogensD. Pnictoogens |
| Answer» Correct Answer - D | |
| 127. |
Which one of the following has the lowest melting point ?A. NB. PC. AsD. Sb |
| Answer» Correct Answer - A | |
| 128. |
The molecular formula of Phosphorous isA. PB. `P_(4)`C. `P_(2)`D. `P_(5)` |
| Answer» Correct Answer - B | |
| 129. |
`{:(,"List-I",,"List-II"),("A)","Phosphorite","1)",KNO_(3)),("B)","Bengal salt petre","2)",Ba(NO_(3))_(2)),("C)","Fluoroapatite","3)",NaNO_(3)),("D)","Chile salt petre","4)",3Ca_(3)(PO_(4))_(2).CaF_(2)),(,,"5)",Ca_(3)(PO_(4))_(2)):}` The correct match isA. `{:("A B C D"),("1 2 3 5"):}`B. `{:("A B C D"),("2 4 3 1"):}`C. `{:("A B C D"),("4 3 5 2"):}`D. `{:("A B C D"),("5 1 4 3"):}` |
| Answer» Correct Answer - D | |
| 130. |
The compound (X) is:A. `P_(2)O_(5)`B. `I_(2)O_(5)`C. `I_(4)O_(9)`D. `S_(3)O_(9)` |
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Answer» Correct Answer - A `2NaN_(3)overset(Delta)rarr 2Na +3N_(2)uarr` |
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| 131. |
Which chloride is not appreciably hydrolysed by waterA. `NCl_(3)`B. `PCl_(3)`C. `AsCl_(3)`D. `SbCl_(3)` |
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Answer» Correct Answer - D `SbCl_(3)` is not easily hydrolysed |
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| 132. |
The anhydride of orthophophoric acid isA. `P_(4)O_(6)`B. `P_(2)O_(4)`C. `P_(4)O_(10)`D. `H_(2)P_(2)O_(6)` |
| Answer» Correct Answer - C | |
| 133. |
The largest bond angle inA. `AsH_(3)`B. `NH_(3)`C. `H_(2)O`D. `PH_(3)` |
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Answer» Correct Answer - B As electronegativity decreases down the group the electron density on central atom of hydride decreases and thus repulsion between bond pair and lone pair of electrons decreases with ultimately decreases `H-M-H` bond angle Therefore `NH_(3)` having highest bond angle. |
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| 134. |
Which of the following is not correct ?A. Hydrolysis of `NCl_(3)` gives `NH_(3) and HOCl`B. `NH_(3)` is less stable than `PH_(3)`C. `NH_(3)` is a weak reducing agent compared to `PH_(3)`D. Nitric oxide in solid state exhibits diamagnetic property |
| Answer» Correct Answer - B | |
| 135. |
Find the number of `ppi-ppi` bonds in `N_(2)O`. |
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Answer» Correct Answer - B Pyrophosphoric acid : `H_(4)P_(2)O_(7)` (contains 4 P - O linkages) |
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| 136. |
Which of the following is/are correct statement?A. `NF_(3)` has trigonal pyramidal structureB. `NF_(3)` is practially insoluble in water and is only hydrolysed when an elecric spark is passed through a mixture with water vapours.C. Dipole moment of `NF_(3)` is more than that of `NH_(3)`D. `N_(2)O_(3)` is an acidic oxide. |
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Answer» Correct Answer - A::B::D Dipole moment of `NF_(3)` is less than that of `NH_(3)` |
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| 137. |
Using `MOT` predict which of the following species has the shortest bond length ? .A. NOB. `NO^(-)`C. `NO^(+)`D. `N_(2)O` |
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Answer» Correct Answer - C `NO^(+)` |
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| 138. |
Choose incorrect statement :A. NO is a paramagentic gasB. `NO_(2)` is paramagentic and colouredC. `NO_(2)` is a mixed anhydrideD. `N_(2)O` forms hyponitrites with alkalies |
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Answer» Correct Answer - D `N_(2)O`: neutral oxide |
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| 139. |
Which of the following is most stableA. `NI_(3)`B. `NF_(3)`C. `NBr_(3)`D. `NCl_(3)` |
| Answer» Correct Answer - B | |
| 140. |
`X rarr` mixed anhydride of nitrous acid and nitric acid `Y rarr` non-aq solvent obtained on colling X. Picl out the correct statements regarding X and Y:A. Y self ionises to `NO^(+)` and `NO_(3)^(-)`B. X is an odd electron molecule and paramagneticC. X reacts with alkali forming the corresponding nitrites and nitratesD. X is used as a catalyst in the lead chamber process for the manufacture of sulphuric acid |
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Answer» Correct Answer - A::B::D `X = NO_(2), Y = N_(2)O_(4)` |
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| 141. |
Which of the following halides is most acidic ?A. `PCl_(3)`B. `SbCl_(3)`C. `BiCl_(3)`D. `C Cl_(4)` |
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Answer» Correct Answer - A In `C Cl_(4)`, carbon atom does not have d-orbitals to accomodate a lone pair of electrons and hence is not a Lewis acid. In `PCl_(3),SbCl_(3) and BiCl_(3)` central atom gas empty d-orbitals in each case but electronegativity of P is maximum, hence `PCl_(3)` is strongest acid. |
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| 142. |
The tendency to form complexes is meximum forA. NB. BiC. AsD. P |
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Answer» Correct Answer - A Nitrogen (due to high electronegativity and small size) |
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| 143. |
Among the following which one is more stable ?A. `PH_(3)`B. `NH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
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Answer» Correct Answer - B due to inter molecular H-bond |
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| 144. |
Which one of the following exceeds octet rule ?A. `NCl_(3)`B. `PCl_(3)`C. `PCl_(5)`D. `NH_(3)` |
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Answer» Correct Answer - C In the valency shell of `PCl_(5)` 10 electrons are present |
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| 145. |
All of the following are bases exceptA. `N_(2)H_(4)`B. `NH_(2)OH`C. `NH_(3)`D. `N_(3)H` |
| Answer» Correct Answer - D | |
| 146. |
(A) : Nitrogen cannot form pentahalides (R) : Nitrogen cannot expand its octet configuration, due to absense of empty d-orbitals.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 - A | |
| 147. |
The oxidation state of nitrogen is a fractional value inA. Hydroxyl amineB. Hydrazoic acidC. Nitrate ionD. Hydrazine |
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Answer» Correct Answer - B Hydrazoic acid `NH_(3) 3x+1=0` `3x=-1,x=(-1)/(3)` |
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| 148. |
Which of the following is a Hydride of NitrogenA. `NH_(3)`B. `N_(2)H_(4)`C. `HN_(3)`D. All |
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Answer» Correct Answer - D Hydrides of nitrogen `NH_(3),N_(2)H_(4),HN_(3)` etc |
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| 149. |
The number of `P-O-P` bonds in cyclotrimetaphosphoric acid, `(HPO_(3))_(3)` isA. phosphoric acid isB. 3C. 9D. 6 |
| Answer» Correct Answer - D | |
| 150. |
The compound `(SiH)_(3)N` is expected to beA. pyramidal and more basic than `(CH_(3))_(3)N`B. Planar and less basic than `(CH_(3))_(3)N`C. pyramidal and less basic than `(CH_(3))_(3)N`D. planar and more basic than `(CH_(3))_(3)N` |
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Answer» Correct Answer - B `(SiH_(3))_(3)N` is planar and less basic than `(CH_(3))_(3)N` because lone pair of N atom is used to form `d pi - p pi` back bonding with Si-atom |
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