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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. |
Aquaregia isA. 1:3 conc. `HNO_(3)` and conc. HCIB. 1:2 conc. `HNO_(3)` and conc. HCIC. 3:1conc. `HNO_(3)` and conc. HCID. 2:1 conc. `HNO_(3)` and conc. HCI |
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Answer» Correct Answer - A One part of concentrated `HNO_3 and 3` parts concentrated HCl form aquaregia. |
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| 102. |
Laughing gas is produced from zine react withA. Dilute `HNO_(3)`B. Conc. `HNO_(3)`C. Dilute `H_(2)SO_(4)`D. `HNO_2` |
| Answer» Correct Answer - A | |
| 103. |
Phosgene isA. `PH_(3)`B. `PCl_(2)`C. `COCl_(2)`D. `SCl_(2)` |
| Answer» Correct Answer - C | |
| 104. |
The percentage of p-character in the orbitals forming `p-p` bonds in `P_4` isA. 25B. 33C. 50D. 75 |
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Answer» Correct Answer - D In `P_4` the P-P linkage is formed by `sp^3- sp^3` hybridized orbital overlapping. So the percentage of P- character will be 75%. |
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| 105. |
Aquaregia is a mixture ofA. 3:1 HCl and `HNO_(3)`B. 1:3 HCl and `HNO_(3)`C. 3:1 `H_(2)SO_(4) and `HNO_(3)`D. 1:3 `H_2SO_4 and HNO_3` |
| Answer» Correct Answer - A | |
| 106. |
Which of the following is not correct for `N_2O?`A. It is called laughing gasB. It is nitrous oxideC. It is not a linear moleculeD. It is least reactive in all oxides of nitrogen |
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Answer» Correct Answer - C `N_2O` is a linear molecule. |
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| 107. |
Which of the following is wrong ?A. Red phosphorus has a polymeric structureB. White phosphorus has higher internal energy than red phosphorusC. Red phosphorus is more active than white phosphorusD. White phosphorus is metastable at all temperature upto the melting point of red phosphorus |
| Answer» Correct Answer - C | |
| 108. |
Nitrogen monoxide isA. neutralB. acidicC. basicD. amphoteric |
| Answer» Correct Answer - A | |
| 109. |
Commercially nitrogen is prepared fromA. by passing vapours of `HNO_(3)` on heated copperB. thermal decomposition of barium azideC. liquification of airD. oxidation of `NH_3` |
| Answer» Correct Answer - C | |
| 110. |
Calcium carbide reacts with nitrogen to giveA. CaCNB. `Ca(CN)_(2)`C. `N_2O`D. `NO_(2)` |
| Answer» Correct Answer - B | |
| 111. |
Which of the following statement is wrong?A. The stability of hydrides increase from `NH_(3)" to "BiH_(3)` in group 15 of the periodic tableB. Nitrogen cannot form `dpi-ppi` bondC. Single N - N bond is weaker than the single P-P bondD. `N_(2)O_(4)`has two resonance structure |
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Answer» Correct Answer - A The stability of hydrides decreases from NH, to BiH, which can be observed from their bond dissociation enthalpy. The correct order is `NH_(3) gt PH_(3) gt AsH_(3) gt SbH_(3) gt BiH_(3)` |
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| 112. |
Nitrogen `(N_(2))` is relatively unreactive, becauseA. its electronegativity is highB. its dissociation energy is largeC. its atomic radius is smallD. it is the first element of group |
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Answer» Correct Answer - B Nitrogen forms strong `N-=N` triple bond. Since dissociation energy of `N-=N` tirple bond is very high, therefore, it exists as a relatively unreactive diatomic molecule in its elemental state. |
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| 113. |
Which statement is not correct for nitrogen?A. It has a small sizeB. It does not readily react with `O_2`C. It is a typical non-metalD. d-orbitals are available or bonding |
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Answer» Correct Answer - D `""_(7)N=1s^(2),2s^(2),2p^(3)` d-orbitals are absent in nitrogen. |
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| 114. |
Nitrogen is relatively inactive element because is atom has a stable electronic configurationA. Its atom has a stable electronic configurationB. It has low atomic radiusC. Its electronegativity is fairly highD. Dissociation energy of its molecule is fairly high |
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Answer» Correct Answer - D N =N bond energy is very high `945"kJ mol"^(-1)`. |
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| 115. |
Which of the following reaction does not occur ?A. `F_(2)+2Cl^(- ) to 2F^(-)+ Cl_(2)`B. `Br_(2)+2I^(-) to 2Br^(-)+I_(2)`C. `Cl_(2)+2Br^(-) to 2Cl^(-)+Br_(2)`D. `I_(2)+2Cl^(-) to 2I^(-)+Cl_(2)` |
| Answer» Correct Answer - D | |
| 116. |
Which of the following is incorrect ?A. When `NO_2` is dissolved in cold water, a mixture of nitrous and nitric acid is formed.B. When `NO_2` is dissolved in hot water, the same reaction occurs as that in cold waterC. `N_2O_5` is made by the reaction of `P_4O_10` with nitric acid vapours.D. `NO_2` is very corrosive gas and reacts directly with a number of metals. |
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Answer» Correct Answer - B With cold water, it gives `HNO_(2) and HNO_(3)` `2NO_(2)+H_(2)O to HNO_(2)+HNO_(3)` But with warm water, it given `HNO_(3) and NO`. `3NO_(2)+H_(2)O to 2HNO_(3)+NO` |
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| 117. |
Nitrozen (i) oxide is produced byA. thermal decomposition of amnmonium nitrateB. disproportionation of `N_2O_4`C. thermal decomposition of ammonium nitriteD. interaction of hydroxylamine and nitrous acid |
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Answer» Correct Answer - D 1 and 4. `NH_(4)NO_(3) overset(Delta)to N_(2)O+2H_(2)O and NH_(2)OH+HNO_(2) to underset(("Hyponitrous acid"))(H_(2)N_(2)O_(2)+H_(2)O)` `H_(2)N_(2)O_2 overset(Delta)to N_(2)O+H_(2)O` |
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| 118. |
Which of the following does not liberate `Br_(2)` form KBr ?A. `I_(2)`B. `Cl_(2)`C. `"Conc."H_(2)SO_(4)`D. `F_(2)` |
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Answer» Correct Answer - A `I_2` cannot liberate `Br_2` from KBr, since `l_2` is weaker oxidant than `Br_2 F_2 and Cl_2`, being stronger oxidants than `Br_(2)`, can liberate `Br_2` from KBr. `F_(2)+2KBr to 2KF+Br_(2)` `Cl_(2)+2KBr to 2KCl +Br_(2)` Reaction of conc. `H_(2)SO_(4)` with KBr forms HBr. HBr is a strong reducing agent. It reduces `H_(2)SO_(4)` to form a mxiture of `SO_(2) and Br_(2)` `KBr+H_(2)SO_(4) to HBr+KHSO_(4)` `KHSO_(4)+KBr tO HBr+K_(2)SO_(4)` HBr an formed reduces `H_(2)SO_(4)` `H_(2)SO_(4)+2HBr to SO_(2)+2H_(2)O+Br_(2)` |
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| 119. |
Complete the following reaction and identify compounds `(A)` and `(B)`. `B(OH)_(3)underset("Fusion")overset(NH_(4)HF_(2))to(A)underset(Delta)overset(B_(2)O_(3))to(B)` |
| Answer» Correct Answer - A::B::C::D | |
| 120. |
Complete the following reaction and write the structure of the product formed. `B_(2)H_(6)underset("High temp.")overset("Excess NH_(3))")to` |
| Answer» Correct Answer - A::B::C::D | |
| 121. |
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 |
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Answer» Correct Answer - B `PH_3` is less basic because lone pair is not easily available for donation. |
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| 122. |
In the reacton `HCOOH overset(H_(2)SO_(4))(rarr)CO+H_(2)O,H_(2)SO_(4)` actss as `a//an`A. dehydrating agentB. oxidising agentC. reducing agentD. all the above |
| Answer» Correct Answer - A | |
| 123. |
In the reacton `HCOOH overset(H_(2)SO_(4))(rarr)CO+H_(2)O,H_(2)SO_(4)` actss as `a//an` |
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Answer» Correct Answer - A Only dehydrating agnet `HCOOH overset(H_(2)SO_(4))to CO+H_(2)O` |
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| 124. |
The dehydration of malonic acid `CH_(2) (COOH)_(2)` with `P_(4)O_(10)` and heat giveA. carbon monoxideB. carbon suboxideC. carbon dioxideD. all three |
| Answer» Correct Answer - B | |
| 125. |
Each of the following is true for white and red phosphorus except that theyA. Are both soluble in `CS_2`B. Can be oxidised by heating in airC. Consists of same kind of atomsD. Can be converted into one another |
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Answer» Correct Answer - A White phophorus is soluble in `CS_2` whereas red phosphorus is insoluble in it. |
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| 126. |
Which of the following is not knownA. `NCl_(5)`B. `NI_(3)`C. `SbCl_(3)`D. `NCl_3` |
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Answer» Correct Answer - A `NCI_5` is not known because of absence of d- |
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| 127. |
Which one of the following elements is most metallic? |
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Answer» Correct Answer - D `underset("Non-metals")ubrace(N" "P) underset("Metalloids")ubrace(As" "Sb) underset("Metal")ubrace(Bi)` |
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| 128. |
Which of the following oxides of nitrogen is the anhydride of `HNO_(3)`?A. NOB. `N_2O_3`C. `N_3O_4`D. `N_2O_5` |
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Answer» Correct Answer - D `underset("Nitric acid")(2HNO_(3)) to N_(2)O_(5)+H_(2)O` |
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| 129. |
Which of the following is a nitric acid anhydride?A. `N_2O`B. `N_2O_3`C. `N_2O_4`D. NO |
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Answer» Correct Answer - B `N_(2)O_(3)+H_(2)O to 2HNO_(2)` |
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| 130. |
The compounds formed when excess of `Cl_(2)`, reacts with `NH_3` areA. `NCl_(3)+N_(2)`B. `NH_(4)Cl+N_(2)`C. `NCl_(3)+HCl`D. `N_(2)Cl+HCl` |
| Answer» Correct Answer - C | |
| 131. |
Pure HF does not attackA. glassB. `SiF_(4)`C. `SiO_(2)`D. polythene |
| Answer» Correct Answer - D | |
| 132. |
Which of the following statement is correct ?A. `PH_3` is more basic than ammoniaB. `PH_3` is less basic than ammoniaC. `PH_3` is equally basic as ammoniaD. `NH_3` is amphoteric and `PH_3` is basic |
| Answer» Correct Answer - B | |
| 133. |
Which one of the following the correct statement?A. Bleaching powder is a source of chlorineB. Bleaching powder is used to change hard water to soft waterC. Bleaching powder is obtained by treating calcium carbonate with chlorineD. Bleaching powder is green in colour Halogen prepared from sea-weeds is |
| Answer» Correct Answer - A | |
| 134. |
The three important oxidation states of phosphorus areA. -3B. `+3`C. `+3 and -5`D. `-3, +3 and +5` |
| Answer» Correct Answer - D | |
| 135. |
A polymer is resistant to heat and chemical attack and is also used for coating articles and cook wares to make them non-sticky. The monomer of this polymer isA. monochlorotrifluoroethyleneB. tetralfluoroethyleneC. chloropreneD. vinyl chloride |
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Answer» Correct Answer - B The polymer is teflon (or PTEE) `[-F_(2)C-CF_(2)-]_(n)` |
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| 136. |
Which of the following belongs to the halogen family?A. FrB. RaC. PoD. Al |
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Answer» Correct Answer - D The group `VII^(th)` A consists of F,CI, Br, I and At. |
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| 137. |
Which of the following does not form stable diatomic molecule ?A. NitrogenB. PhosphorusC. HydrogenD. Oxygen |
| Answer» Correct Answer - B | |
| 138. |
Which of the following elements show allotropy? 1.Carbon 2.Sulphur 3. Phosphorus 4. HydrogenA. 1,2,3 and 4B. 2 and 4C. 1,3 and 4D. 1,2 and 3 |
| Answer» Correct Answer - D | |
| 139. |
Similarity of fluorine and oxygen may not be attributed toA. their atomic and ionic radii are closely similarB. the atoms of both elements are restricted to an octet of electrons in their valence shellC. both of them are highly electronegative elementsD. both form stable pr-pa multiple bonds with themselves |
| Answer» Correct Answer - A | |
| 140. |
Match Iist I with list II and select the correct answer using the codes given below the lists. A. `{:(, ,A,B,C,D),(,(a),4,1,3,2):}`B. `{:(, ,A,B,C,D),(,(b),2,3,1,4):}`C. `{:(, ,A,B,C,D),(,(c),1,4,2,3):}`D. `{:(, ,A,B,C,D),(,(d),2,3,4,1):}` |
| Answer» Correct Answer - D | |
| 141. |
Which one of the following acid is the weakest? (MP PMT 1985)A. `HClO`B. HBrC. `HClO_(3)`D. HCl |
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Answer» Correct Answer - A `underset("Weakacid")(HClO) Leftrightarrow H^(+) +underset("Strong conjugate base")(ClO^(-))` |
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| 142. |
Which of the following is a false statement ?A. Halogens are strong oxidizing agentB. Halogens show only -1 oxidation stateC. HF molecules form intermolecular H-bondsD. Fluorine is highly reactive |
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Answer» Correct Answer - B Fluorine, being most electronegative element, always show the oxidation state of -I. Other halogens can show higher positive oxidation states i.e. +1, +3, +5, + 7 in addition to negative oxidation of -1. |
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| 143. |
Of the following element, the one showing only one oxidation state isA. `I_(2)`B. `F_(2)`C. `Cl_(2)`D. `Br_(2)` |
| Answer» Correct Answer - B | |
| 144. |
Which of the following is metalloid ?A. OB. SC. PoD. Te |
| Answer» Correct Answer - D | |
| 145. |
In 16th group element, which element does not show negative oxidation state ?A. OB. SC. PoD. Te |
| Answer» Correct Answer - C | |
| 146. |
Electron gain energy is maximum in case ofA. OB. SC. TeD. Se |
| Answer» Correct Answer - B | |
| 147. |
The sum of energy team involved in the reaction: `1//2 X_(2(g))rarr X_((aq))^(Theta)` is highest in case ofA. `F_(2)`B. `Cl_(2)`C. `Br_(2)`D. `I_(2)` |
| Answer» Correct Answer - A | |
| 148. |
Which element has higher charge density?A. OB. SC. SeD. Po |
| Answer» Correct Answer - A | |
| 149. |
Three centred two electron bond is present inA. `NH_(3)`B. `B_(2)H_(6)`C. `BCl_(3)`D. `AlCl_(3)` |
| Answer» Correct Answer - B | |
| 150. |
Which of the following mixture gives chromicA. `K_(2)Cr_(2)O_(7)" and conc." H_(2)SO_(4)`B. `K_(2)_Cr_(2)O_(7) and HCl`C. `K_(2)SO_(4) and conc. H_(2)SO_(4)`D. `H_(2)SO_(4) and HCl` |
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Answer» Correct Answer - A Mixuture of `K_(2)Cr_(2)O_(7) and "conc," H_(2)SO_(4)` is known as chromic acid. |
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