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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.
| 151. |
Which of the following statements regarding sulphur is incorrect?A. `S_2` molecule is paramagneticB. The vapour at `200^@C` consists mostly of Sg ringsC. At `600^@` the gas mainly consists of `S_2` moleculesD. The oxidation state of sulphur is never less than +4 in its compounds |
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Answer» Correct Answer - D Sulphur exhibit +2, +4, +6 oxidation state but +4 and +6 are more common. |
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| 152. |
Sulphur molecule is converted into sulphur ion, when itA. gains two electronsB. loses two electronsC. grains two protonsD. shares two electrons |
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Answer» Correct Answer - A `1/8 S_(8)+2e^(-) to S^(2-)` |
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| 153. |
The mixture of concentrated `HCl` and `HNO_(3)` made in `3:1` ratio containsA. `CIO_(2)`B. NOClC. `NCl_(3)`D. `N_(2)O_(4)` |
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Answer» Correct Answer - B `3HCl+HNO_(3) to NOCl +2H_(2)O+Cl_(2)` |
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| 154. |
Which of the following statement is not trueA. HF is a stronger acid than HClB. Among halide ions, iodide is the most powerful reducing agentC. Fluroine is the only hologen that does not show a variable oxidation stateD. HOCl is a stronger acid than HOBr |
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Answer» Correct Answer - A HF is a weak acid due to intermolecular hydrogen bonding. |
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| 155. |
Which of the following sequence is correct with reference to the oxidation number of iodine.A. `I_(2) gt ICI lt HI lt HIO_(4)`B. `HIO_(4) lt ICI lt I_(2) lt HI`C. `I_(2) lt HI, ICI lt HIO_(4)`D. `HI lt I_(2) lt ICI lt HIO_(4)` |
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Answer» Correct Answer - D `HI lt I_(2) lt ICI lt HIO_(4)` |
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| 156. |
The correct order of acidic strength.A. `Cl_(2)O_(7) gt SO_(2) gt P_(4)O_(10)`B. `K_(2)O gt CaO gt MgO`C. `CO_(2) gt N_(2)O_(5) gt SO_(3)`D. `Na_(2)O gt MgO gt Al_(2)O_(3)` |
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Answer» Correct Answer - A Acidic nature of oxide `alpha` Non metallic nature of element of Non metallic nature decrease in the order `Cl gt S gt P`. |
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| 157. |
There is S-S bond inA. `S_2O_(4)^(2-)`B. `S_(2)O_(5)^(2-)`C. `S_(2)O_(6)^(2-)`D. All of these |
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Answer» Correct Answer - D a). `S_(2)O_(4)^(2-) " """^(-)O-overset(O)overset(||)S-overset(O)overset(||)S-O^(-)` b). `S_(2)O_(5)^(2-) " """^(-)O-O-overset(O)overset(||)S-overset(O)overset(||)S-O^(-)` c). `S_(2)O_(6)^(2-) " """^(-)O-underset(O)underset(||)overset(O)overset(||)S-underset(O)underset(||)overset(O)overset(||)S-O^(-)` |
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| 158. |
Chlorine can removeA. Br from NaBr solutionB. F from NaF solutionC. Cl from NaCl solutionD. F from `CaF_2` solution |
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Answer» Correct Answer - A `Cl_(2)+2NaBr to 2NaCl+Br_(2)` |
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| 159. |
Which statement is false?A. Electronegativity of fluorine is maximumB. Electron affinity of fluorine is maximumC. Melting point of fluorine is minimumD. `F_(2)` is gas |
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Answer» Correct Answer - B Electron affinity of `Cl_(2)` is maximum `{:(,"Element", F , Cl, Br, I),(,E.A."kj/mole",-332.6,348.5,324.7,295.5):}` |
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| 160. |
Which of the following statements is false ?A. Radon is obtained from the decay of radiumB. `He_2` does not existC. Xenon is the most reactive among the rare gasesD. The most abundant rare gas found in the atmosphere is helium |
| Answer» Correct Answer - A | |
| 161. |
The formula of mustard gasA. `CCl_(3).NO`B. `(Cl.C_(2)H_(4))_(2)S`C. `CCl_(2).F_(2)`D. `COCl_(2)` |
| Answer» Correct Answer - B | |
| 162. |
The reaction of `BrO_(3)^(-) and F_2` in alkaline medium formsA. `Br^(-)`B. `Br_(2)`C. `Obr^(-)`D. `BrO_(4)^(-)` |
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Answer» Correct Answer - D `BrO_(3)^(-)+F_(2)+2OH^(-) to BrO_(4)^(-)+2F^(-)+H_(2)O` |
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| 163. |
There is no `S-S` bond inA. `S_2O_(4)^(2-)`B. `S_(2)O_(5)^(2-)`C. `S_(2)O_(3)^(2-)`D. `S_(2)O_(7)^(2-)` |
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Answer» Correct Answer - D The structure are `""^(-)O-underset(S_(2)O_(4)^(2-)) overset(S)overset(||)S-overset(O)overset(||)S-O^(-)` |
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| 164. |
Which of following in the strongest acid ?A. `ClO_(3)(OH)`B. `ClO_(2)(OH)`C. `SO(OH)_(2)`D. `SO_(2)(OH)_(2)` |
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Answer» Correct Answer - A `CIO_3(OH) or HCIO_4`, is the known strongest acid, Acid strength depends upon the oxidation state and the electronegativity of the central atom. In `ClO_3(OH),` the chlorins atom is in its highest oxidation state. `CIO_3(OH)` is stronger acid than `SO_2(OH)_2`, because Cl is in higher oxidation state (+7) and also chlorine is more electronegative than sulphur. |
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| 165. |
Which of the following statements is not true about noble gases ?A. Their ionization energy are very highB. Their electron affinities are nearly zeroC. They do not form any chemical compoundsD. They are not easily liquefied. |
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Answer» Correct Answer - C They form a large number of compounds. The first noble gas compound formed by Neil Bartlett (1962) is Xe `[PtF_(6)]^(-)`. |
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| 166. |
When chlorine Water le added to a solution of the solution inmmediately turns orange red, becauseA. chlorine is reduced to chloride ionB. of the fermation of BrClC. bromide ion is oxidized to bromineD. of the formation of `Br_(3)^(-)` |
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Answer» Correct Answer - B `Br_2` formed by added chlorine water to a solution of KBr, further reacts with `Cl_2` to form reddish- yellow or orange-red BrCl. `Br_(2)+Cl_(2) to 2BrCl` |
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| 167. |
The hydrolysis of XeF4 at room temperature givesA. `XeO_(3)`B. XeC. `XeOF_(2)`D. both `XeO_(3) and Xe` |
| Answer» Correct Answer - C | |
| 168. |
The increase in boiling points of noble gases from He to Xe is due to theA. decreases in ionization energyB. increases in polarizabilityC. increase in electron affinityD. increase in atomic volume. |
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Answer» Correct Answer - B As we go down the group from He to Xe, the size of atom increases, due to which ease of polarization of noble gas atom (or molecule) increases. Xe is 20 times more polarizable than He. The increasing polarizability has its effect on strengthening intermolecular interactions (dispersion forces), which in-turn increases the boiling and melting points. Increasing intermolecular attractions also make their liquefaction easier. |
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| 169. |
Which one is most stable to heat ?A. HClOB. `HClO_(2)`C. `HClO_(3)`D. `HClO_(4)` |
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Answer» Correct Answer - D As the oxidation state of the halogen atom increases, the halogen-oxygen bond becomes more and more covalent. As a result, the thermal stability of the oxo acid increases. Thus, `HCIO_(4)`, is most stable to heat, whereas HCIO is least stable to heat. |
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| 170. |
Which of the following is not known ?A. `KrF_(6)`B. `XeF_(6)`C. `XeO_(3)`D. `KrF_(2)` |
| Answer» Correct Answer - A | |
| 171. |
The sulphide, which is orange red isA. `Sb_(2)S_(3)`B. `As_(2)S_(3)`C. CdsD. `Ag_(2)S` |
| Answer» Correct Answer - A | |
| 172. |
The most stable form of sulphur at room temperature isA. monoclínic sulphurB. rhombic sulphurC. plastic sulphurD. milk of sulphur |
| Answer» Correct Answer - B | |
| 173. |
The hoble gas which used to measure the thickness of plastic sheet isA. HeB. NeC. KrD. Ar |
| Answer» Correct Answer - D | |
| 174. |
Xe reacts directly withA. `O_2`B. `Cl_(2)`C. `F_2`D. `Br_(2)` |
| Answer» Correct Answer - C | |
| 175. |
In which of the following compounds, the oxidation stable of xenon is not six ?A. `XeF_(2)`B. `XeOF_(4)`C. `XeOF_(2)`D. `XeO_(3)` |
| Answer» Correct Answer - C | |
| 176. |
Xenon best rect withA. the most electropositive elementsB. the most electronegative elementsC. the hydrogen halidesD. nonmetals |
| Answer» Correct Answer - B | |
| 177. |
Correct order isA. `HOCl lt HClO_(2), lt HClO_(3) lt HCIO_(4)("Acidic nature ")`B. `HF lt HCl lt HBr lt HI("Acidic nature ")`C. `CH_(4) lt SiH_(4) lt GeH_(4) lt SnH_(4) ("Reducing nature")`D. All |
| Answer» Correct Answer - D | |
| 178. |
Thallium(Tl) Show +1 stable oxidation state due to becauseA. Of high reactivityB. Of inert pari effectC. Of its amphoteric natureD. It is a transition metal |
| Answer» Correct Answer - B | |
| 179. |
Size of the iodine species following the order:A. `I^(+) gt I^(+) gt I`B. `I gt I^(-) gt I^(+)`C. `I gt I^(+) gt I^(-)`D. `I^(-) gt I gt I^(+)` |
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Answer» Correct Answer - D Due to the addition of an electron to the neutral an anion is formed, and the electron to proton ratio increases, hence the electron cloud in the anion expands, resulting in the increased anion size. |
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| 180. |
In `N_2O_4` oxidation state of nitrogen isA. `-4`B. `+4`C. `-3`D. `+3` |
| Answer» Correct Answer - B | |
| 181. |
Of the following acids, the one that is strongest isA. `HBrO_(4)`B. HOClC. `HNO_(2)`D. `H_(3)PO_(3)` |
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Answer» Correct Answer - A Oxidation number of `HBrO_(4)` is more than that of HOCl, `HNO_(2) and H_(3)PO_(3)` so it is the strongest acid among these. |
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| 182. |
Which of the following arrangements gives the correct order of increasing basic character of the conjugate bases of the oxoacids of chlorine?A. `ClO^(-) lt ClO_(2)^(-) lt ClO_(3) lt ClO_(4)^(-)`B. `ClO_(4)^(-) lt ClO_(3)^(-) lt ClO_(2)^(-) lt ClO^(-)`C. `ClO_(4)^(-) lt ClO_(3)^(-) lt ClO^(-) lt ClO_(2)`D. `ClO_(3)^(-) lt ClO_(4)^(-) lt ClO_(2)^(-) lt ClO^(-)` |
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Answer» Correct Answer - A Smallest cation is heavily hydrated `ClO_(4)^(-)` has smallest central atom as it has +7 charge on it followed by `ClO_(3)^(-)(+5), ClO_(2)^(-)(+3),ClO^(-)(+1)`. So the order of hydration energy of `ClO_(4)^(-) gt ClO_(3)^(-) gt ClO_(2)^(-) gt ClO^(-)` |
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| 183. |
The most abundant noble gas in the atmosphere isA. HeB. NeC. ArD. Xe |
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Answer» Correct Answer - C In atmosphere, Ar is 0-934% by volume and 1-285% by mass. |
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| 184. |
Which of the following statement is not valid for oxoaids of phosphorus?A. Orthophosphoric acid is used in the manufacture of triple superphosphateB. Hypophosphorous acid is a diprotic acidC. All oxoacids contain tetrahedral four coordinated phosphorusD. All oxoacids contain atleast one P=O unit and one P-OH group |
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Answer» Correct Answer - B `[H-underset(OH)underset(|)(overset(O)overset(||)(P)-H)]` Hypophosphorous acid `(H_3PO_2)` is a monobasic acid. |
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| 185. |
Which one statement about `SO_2` is incorrectA. It has an angular shape.B. It decolourlised acidified potassium permagnate solution.C. Two S-O bonds are equal.D. It is a dehydrating agent. |
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Answer» Correct Answer - D `SO_2`, is not a dehydrating agent. |
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| 186. |
`H_(2)S` is not a/anA. Reducing agentB. AcidicC. Oxidising agentD. None of these |
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Answer» Correct Answer - C `H_(2)S` is not an oxidising agent. `PbO + H_2S PbS+ H_2O.` It acts as a reducing agent. Also in chalcogens the acidic nature of hydride increases from `H_2O" to "H_2Te.` |
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| 187. |
Which of the following is a the most preferred and hence of the lower energy for `SO_(3)`?A. B. C. D. |
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Answer» Correct Answer - B Formal charges help in the selection of the lowest energy structure from a nmber of possible Lewis structures for a given species. Generally the lowest energy strcture is the one with the smallest formal charges on the atoms. |
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| 188. |
On reaction with water, calcium phosphide producesA. `Ca_(3)(PO_(4))_(2)`B. `H_(3)PO_(4)`C. `COCl_(2)`D. `PH_(3)` |
| Answer» Correct Answer - D | |
| 189. |
Pick out the incorrect statement.A. Except nitrogen, all the elements of group 15 exist in allotropic modificationB. Only at high temperatures, greater than 1070 K, phosphorus vapours dissociates into `P_2` moleculesC. Red P is obtained by heating white phosphorus at 540-570 K in the absence of air for several hours.D. White P is more reactive, but less soluble in `CS_2` (and other organic solvents) than red P. |
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Answer» Correct Answer - D White phosphorus is readily soluble in `CS_2` and other organic solvent, but red phosphorus is insoluble in these. |
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| 190. |
Which one of the following is a covalent hydride ?A. `NaH`B. `CaH_(2)`C. `BrH_(2)`D. `AsH_(3)` |
| Answer» Correct Answer - D | |
| 191. |
`H_(3)PO_(3)` disproportionates toA. `H_(3)PO_(4) and PH_(3)`B. `HPO_(3) and PH_(3)`C. `H_(3)PO_(2) and PH_(3)`D. `P_(2)O_(5) and PH_(3)` |
| Answer» Correct Answer - A | |
| 192. |
Which one of the following compounds has bond angle close to `90^@` ?A. `NH_(3)`B. `H_(2)S`C. `CH_(4)`D. `H_(2)O` |
| Answer» Correct Answer - B | |
| 193. |
Write balanced equations for the sfollowing reactions: Lead sulphide is heating in air. |
| Answer» Correct Answer - A::B::C::D | |
| 194. |
Antimony with hot conc. `HNO_(3)`, produces oxides and behave likeA. metalB. non-metalC. metalloidD. any of the above |
| Answer» Correct Answer - B | |
| 195. |
`sp^(3)d-` hybridization is possible inA. `SCl_(2)`B. `SCl_(4)`C. `SF_(6)`D. `SeCl_(6)` |
| Answer» Correct Answer - B | |
| 196. |
Decreasing order of reducing property of dioxide of 16th group element isA. `PoO_(2) gt TeO_(2) gt SeO_(2) gt SO_(2)`B. `SO_(2) gt SeO_(2) gt TeO_(2) gt PoO_(2)`C. `SeO_(2) gt SO_(2) gt TeO_(2) gt PoO_(2)`D. `SO_(2) gt TeO_(2) gt PoO_(2) gt SeO_(2)` |
| Answer» Correct Answer - B | |
| 197. |
Which of the following has weakest reducing nature?A. `NH_(3)`B. `PH_(3)`C. `AsH_(3)`D. `SbH_(3)` |
| Answer» Correct Answer - A | |
| 198. |
Which one of the following is not correct ?A. Ar is used in electric bulbsB. Kr is obtained during radioactive decayC. Boiling point of He is lowest among all noble gasesD. Xe forms `XeOF_4` |
| Answer» Correct Answer - D | |
| 199. |
Which one of the following is not formed when an electric discharge passes through helium ?A. `HeH^(+)`B. `HeH^(2+)`C. `He_(2^(+))`D. `He_(2)` |
| Answer» Correct Answer - C | |
| 200. |
Carbon forms larger number of compounds because it hasA. low electron effinityB. variable valencyC. catenation propertyD. no d-orbital in valency shell |
| Answer» Correct Answer - C | |