InterviewSolution
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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. |
Do the non-metallic character exhibited by the halogens have any relation to ionization enthalpy ? |
| Answer» Higher is the ionization enthalpy higher the non-metallic character. | |
| 152. |
Which among the following elements will have a positive electron gain enthalpy ? B, C, N, O. |
| Answer» N because of the stable half-filled 2p-orbital. | |
| 153. |
For which element the second ionization enthalpy is expected to be greater, N or O ? |
| Answer» For oxygen, because in the degenerate p-orbital electron are more symmetrically distributed. The 2p orbital is half-filled. | |
| 154. |
What is the expected order of ionization enthalpy for the given elements Li, Na, K and Rb ? |
| Answer» `Li gt Na gt K gt Rb`. | |
| 155. |
It out of two given elements A and B, A has a higher ionization energy than B, which element is expected to be more electronegative A or B ? |
| Answer» A is more electronegative. | |
| 156. |
The outermost electronic configuration of the most electronegative element isA. `2s^(2)2p^(3)`B. `2s^(2)2p^(4)`C. `2s^(2) 2p^(5)`D. `3s^(2)3p^(5)` |
| Answer» Correct Answer - C | |
| 157. |
The elements which are radioactive and have been named after the name of planet areA. HgB. NpC. PuD. Ra |
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Answer» Correct Answer - B::C Np, Pu and Ra are radioactive but Np and Pu have been named after the names of the planets Neptune and Pluto. |
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| 158. |
Which one of the elements has the maximum electron affinity?A. FB. ClC. BrD. I |
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Answer» Correct Answer - B Flourine although have highest electronegativity due to its very small size, effective inter electronic repulsions are observed which brings down its electron affintiy. |
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| 159. |
Which of the following pair has elements containing same number of electrons in the outermost orbitA. N , OB. Na , CaC. As , BiD. Pb , Sb |
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Answer» Correct Answer - C Both belongs to VA group. |
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| 160. |
Which of the following does not reflect periodicity of elements ?A. Bonding behaviourB. ElectronegativityC. Ionisation energyD. Neutron/proton ratio |
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Answer» Correct Answer - D `n//p` ratio is a cause of radioactivity. |
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| 161. |
In five kingdom system the main basis of classification isA. structure of nucleusB. mode of nutritionC. structure of cell wallD. asexual reproduction |
| Answer» Correct Answer - B | |
| 162. |
Ergot of rye is caused by a species ofA. ClavicepsB. PhytophthoraC. UncinulaD. Ustilago |
| Answer» Correct Answer - A | |
| 163. |
Which one possesses characters of both plants and animals ?A. BacteriaB. MycoplasmaC. ParamoeciumD. Euglena. |
| Answer» Correct Answer - D | |
| 164. |
Amongest `H_(2)O,H_(2)S,H_(2)Se` and `H_(2)Te` the one with highest boiling point is :A. `H_(2)O` because of hydrogen bondingB. `H_(2)Te` because of higher molecular weightC. `H_(2)S`because of hydrogen bondingD. `H_(2)Se` because of lower molecular weight |
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Answer» Correct Answer - A S, Se, Te cannot undergo hydrogen bond formation because of their larger size and lower electronegativity values. |
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| 165. |
Which type of place is most likely to have members of kingdom- Fungi ?A. Cold and wetB. Hot and dryC. Warm and humidD. Cold and humid |
| Answer» Correct Answer - C | |
| 166. |
The kingdom having holozoic type of nutrition in organisms isA. kingdom -AnimaliaB. kingdom-PlantaeC. kingdom-MoneraD. kingdom - Protista |
| Answer» Correct Answer - A | |
| 167. |
ICZN/ICBN does not apply toA. virusesB. plantsC. animalsD. bacteria |
| Answer» Correct Answer - A | |
| 168. |
The correct order of decreasing electronegativity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium isA. `(II)gt(III)gt(I)gt(IV)`B. `(III)gt(IV)gt(II)gt(I)`C. `(I)gt(II)gt(III)gt(IV)`D. `(I)gt(II)gt(IV)gt(III)` |
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Answer» Correct Answer - A Electronegativity values of given elements are as follows: `{:(Be-1.5(I),Mg-1.2(IV)),(O-3.5(II),N-3.0(III)),(i.e.IIgtIIIgtIgtIV,):}` |
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| 169. |
Increasing order of electronegativity isA. `BiltPltSltCl`B. `PltBiltSltCl`C. `SltBiltPltCl`D. `ClltSltBiltP` |
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Answer» Correct Answer - A Increasing order of electronegativity is `BiltPltSltCl`. |
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| 170. |
Fluorine is the best oxidising agent because it hasA. Highest electron affinityB. Highest `E_("red")^(@)`C. Highest `E_("oxid")^(@)`D. Lowest electron affinity |
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Answer» Correct Answer - B Gold is found in native state. |
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| 171. |
Fluorine, chlroine, bromine and iodine are placed in the same group (17) of the periodic table, becauseA. They are non-metalsB. They are electronegativeC. Their atoms are generally univalentD. They have 7 electrons in the outermost shell of their atom |
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Answer» Correct Answer - D Electronic configuration of outermost shell of group-17 or halogens are `ns^(2)np^(5)` . |
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| 172. |
On going from right to left in a period in the periodic table the electronegativity of the elementsA. IncreasesB. DecreasesC. Remain unchangedD. Decreases first then increases |
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Answer» Correct Answer - B Decrease as atomic size increases. |
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| 173. |
In the periodic table, going down in fluorine groupA. Reactivity will increaseB. Electronegativity will increaseC. Ionic radius will increaseD. Ionisation potential will increase |
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Answer» Correct Answer - C Ionic radius will increase as number of shells increases. |
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| 174. |
Going from fluorine to chlorine, bromine and iodine, the electronegativityA. IncreasesB. DecreasesC. First decreases then increasesD. Changes randomly |
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Answer» Correct Answer - B Electronegativity decreases down the group. |
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| 175. |
Which of the following parasites is nonliving outside the host but becomes living on entering it?A. VirusB. BacteriaC. PPLOD. None of these |
| Answer» Correct Answer - A | |
| 176. |
TMV was first virus to be purified and crystallised by an american microbiologist in 1935 for which Nobel Prize was awarded to him in 1946. He wasA. W. M. StanleyB. Peyten RousC. SumnerD. Andre Lwoff |
| Answer» Correct Answer - A | |
| 177. |
Virus was first discovered/the first virus TMV was discovered by a Russian botanist in 1892. He wasA. Dmitrii lvanowskiB. M. W. BeijerinckC. Charles Ee/useD. Adolf Mayer |
| Answer» Correct Answer - A | |
| 178. |
TMV isA. ds RibovirusB. ds DeoxyvirusC. ss RibovirusD. Ribovirus with 6400 capsomeres |
| Answer» Correct Answer - C | |
| 179. |
Leucosin (Chrysolaminarin) is a carbohydrate which is stored as reserve food in case ofA. DiatomB. EuglenaC. DinoflagellatesD. Paramoecium |
| Answer» Correct Answer - A | |
| 180. |
A : Majority of bacteria are autotrophs. R : Chemoheterotrophic nutrition is absent in bacteria.A. If both assertion & reason are true and the reason is the correct explanation of the assertionB. If both assertion & reason are true but the reason is not the correct explanation of the assertionC. If assertion is true statement but reason is falseD. If both assertion and reason are false statements |
| Answer» Correct Answer - D | |
| 181. |
Which of the following represents the correct order of increasing first ionisation enthalpy for `Ca,Ba,Se`, and `Ar`?A. `CaltSltBaltSeltAr`B. `SltSeltCaltBaltAr`C. `BaltCaltSeltSltAr`D. `CaltBaltSltSeltAr` |
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Answer» Correct Answer - C Order of increasing `DeltaH_(IE_(1)):BaltCaltSeltSltAr` `BaltCa,SeltS:` On moving top to bottom in a group, size increases. So ionisation energy decreases. Ar : Maximum value of ionisation energy, since it is an inert gas. |
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| 182. |
Which ionisation potential (IP) in the following equations involves the greatest amount of energyA. `NararrNa^(+)+e^(-)`B. `K^(+)rarrK^(2+)+e^(-)`C. `C^(2+)rarrC^(3+)+e^(-)`D. `Ca^(+)rarrCa^(2+)+e^(-)` |
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Answer» Correct Answer - B `K^(+)rarrK^(2+)+e^(-)`. Since `e^(-)` is to be removed from stable configuration. |
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| 183. |
Which one of the following elements has the highest ionisation energy?A. NaB. MgC. CD. F |
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Answer» Correct Answer - D It has maximum no. of `e^(-)` in outermost shell. So it has maximum I.E. |
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| 184. |
Which of the following has highest ionisation energy ?A. OxygenB. NitrogenC. FluorineD. Sulphur |
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Answer» Correct Answer - D Among oxygen, nitrogen, fluorine and sulphur, the lowest ionisation energy is of sulphur. As their first ionisation values indicated below. N=1402.1 kJ/mol, O=1313.7 kJ/mol, F=1680.8 kJ/mol, S=999.4 kJ/mol. As down the group, the number of inner shells increases. Therefore ionisation energy decreases due to screening effect. |
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| 185. |
Which of the following has the highest first ionisation energy?A. LiB. BeC. BD. C |
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Answer» Correct Answer - D The ionisation energy of Li, Be, B and C is 520, 899, 801, 1086 kJ/mol respectively hence, carbon has highest `IE_(1)`. |
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| 186. |
Which has the highest second ionisation potenitial?A. NitrogenB. CarbonC. OxgyenD. Fluorine |
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Answer» Correct Answer - C In second transition electron is to be removed from half filled orbital. |
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| 187. |
The element having the electronic configuration `[Kr] 4d(10) 4f^(14) 5s^(2) 5p^(6) 5d^(2) 6s^(2)` belongs toA. s-blockB. p-blockC. d-blockD. f-block |
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Answer» Correct Answer - C d-Block because the last electron enters d-subshell. |
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| 188. |
Curing of tea leaves is brought about by the activity ofA. BacteriaB. MycorrhizaC. VirusesD. Fungi |
| Answer» Correct Answer - A | |
| 189. |
Which one is the wrong pairing for the disease and its causal organismA. Black rust of wheat - Puccinia graminisB. Loose smut of wheat - Ustilago nudaC. Root-knot of vegetables - MeloidogyneD. Late blight of potato - Alternaria solani |
| Answer» Correct Answer - D | |
| 190. |
Bacterial leaf blight of Rice is caused byA. ErwiniaB. XanthomonasC. PseudomonasD. Alternaria |
| Answer» Correct Answer - B | |
| 191. |
Assertion: The atomic radii of calcium is smaller than sodium Reason: Calcuim has a lower nuclear charge than sodium.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not a correct explanation of the assertionC. If assertion is true but reason is falseD. If the assertion and reason both are false |
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Answer» Correct Answer - C Calcium has a higher nuclear charge than sodium. |
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| 192. |
Assertion : Positive ions will be wider than parent atoms. Reason : Nuclear charge pulls them closer.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not a correct explanation of the assertionC. If assertion is true but reason is falseD. If the assertion and reason both are false |
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Answer» Correct Answer - D Positive ions will be smaller than parent atoms. |
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| 193. |
Members of Kingdom Plantae areA. EucaryoticB. MulticellularC. UnicellularD. All the above. |
| Answer» Correct Answer - D | |
| 194. |
(a) The tall girl with her head weighed down means the girl __________________. (i) is ill and exhausted (ii) has her head bent with shame (iii) has untidy hair |
| Answer» (ii) is ill and exhausted | |
| 195. |
The most polar bond isA. O-FB. N-ClC. N-FD. N-N |
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Answer» Correct Answer - C The polarity of bond is due to electronegativity difference. N-F bond is most polar because there is a great difference in the electronegativity of nitrogen and fluorine. |
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| 196. |
Which of the following is a false statementA. Fluorine is more electronegative than chlorineB. Nitrogen has greater `IE_(1)` than oxygenC. Lithium is amphotericD. Chlorine is an oxidising agent |
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Answer» Correct Answer - C Lithium is basic in nature and hence it is not amphoteric. |
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| 197. |
Which of the following statement concerning lanthanides elements is false.A. Lanthanides are separated from one another by ion exchange methodB. Ionic radii of trivalent lanthanides steadily increases with increase in the atomic numberC. All lanthanides are highly dense metalsD. More characteristic oxidation state of lanthanide elements is +3 |
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Answer» Correct Answer - B Ionic radius of trivalent lanthanides almost remains constant with increase in the atomic number. |
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| 198. |
The chemical elements are arranged in the order of increasing electronegativities in the sequenceA. P, Si, Se, Br, NB. Si, Se, P, Br, NC. Si, P, Se, Br, ND. Se, P, Si, Br, N |
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Answer» Correct Answer - C Electronegativity increases as we move from left to right in a period so phosphours is more electronegative than silicon and bromine is more electronegative than selenium and electronegativity decreases as we descend the group. `therefore` Nitrogen is the most electronegative element of the given elements. `therefore` The observed order is Si, P, Se, Br, N. |
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| 199. |
Which of the following have maximum electronegativityA. AlB. SC. SiD. P |
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Answer» Correct Answer - B Electronegativity increases across a period. |
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| 200. |
Which element has the lowest electronegativityA. LiB. FC. FeD. Cl |
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Answer» Correct Answer - A `Li_(3)-1s^(2)2s^(1)` donates `1e^(-)` easily. |
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