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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.
| 451. |
Which of the following process is exothermic?A. `F^(-) rarr F`B. `N rarr N^(2-)`C. `O rarr O^(2-)`D. `2CI^(+) rarr CI_(2)` |
| Answer» Correct Answer - D | |
| 452. |
Which of the following processes is exothermic?A. `O rarr O^(-)`B. `O^(-) rarr O^(2-)`C. `S^(-) rarr S^(2-)`D. `Li rarr Li^(+)` |
| Answer» Correct Answer - A | |
| 453. |
A sharp change in the atomic radius is observed from lithium to potassium but a gradual change in the atomic radius is ovesrved from potassium to caesium. Explain. |
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Answer» A sharp increase in the atomic radius is observed from lithium to potassium due to increase in the number of shells. But a gradual change is observed from potassoum to caesium due to filling up of d electrons in the pennultanate shell that increases tha effective nuclear charge. Hence, increase in size is gradual and not sharp. |
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| 454. |
Assertion :-HCl is more polar than HF. Reason :- Cl has more E.N. than F.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.C. If Assertion is True, but the Reason is False.D. If both Assertion & Reason are false |
| Answer» Correct Answer - D | |
| 455. |
The first lanthanide isA. `La`B. `Ce`C. `Th`D. `Lu` |
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Answer» Correct Answer - B |
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| 456. |
What is the maximum number of electron possible in `Ni^(+)` having same spin. |
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Answer» Correct Answer - [0015] `[Ni^(+) = 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(7)` Maximum number of electron having same spin `= 15]` |
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| 457. |
A,B and C are oxides of elements X,Y and Z respectively. X,Y and Z are in the same period of the periodic table. A gives an aqueous solution which turns blue litmus red. B reacts with both strong acids and strong alkalies. C gives an aqueous solution which is strongly alkaline. Which of the following statement is/are true ? (P) All the three elements are metals. (Q) The electronegativites decreases from X to Y to Z. (R) The atomic radius increases in the order `X lt Y lt Z`. (S) X,Y and Z could be phosphorus, aluminium and sodium respectively.A. P,Q,R only correctB. P,R only correctC. Q,S only correctD. Q,R,S only correct |
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Answer» Correct Answer - D `A rarr` acidic oxide, (non-metal) (X) `B rarr` amphoteric oxide (Y) `C rarr` basic oxide (metal) (Z) |
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| 458. |
Two elements A and B have values of electronegativity respectively as 4 and 1.2, then the compound A-B will be:A. predominantely covalentB. predominantely ionicC. % covalent character less than 50%D. both (b) and (c) |
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Answer» Correct Answer - D `Delta EN = 4 - 1.2 = 2.8 gt 1.7` `rArr` Predominatly ionic. |
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| 459. |
Atomic number of Ag is 47. in the same group, the atomic number of elements placed above and below Ag will be:A. 37,67B. 29,79C. 39,69D. 18,28 |
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Answer» Correct Answer - B `Cu rArr 47 - 18 = 29: Au rArr 47+32 =79` |
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| 460. |
The strength of an oxyacid `E(OH)_(n)` , where E is the central atom , depends uponA. Electronegative of E but not on atomic sizeB. Atomic size of E but not on electronegative of EC. Not on oxidation state of E in oxyacidsD. Atomic size electronegativity and oxidation state of E |
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Answer» Correct Answer - D |
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| 461. |
Define the general formula of non-polar compound on the basis of given information, where the electronic configuration of valence shell for A and B are as follows (a) `ns^(2)np^(3)` (b) `ns^(2)np^(5)`: (P) `AB_(3)` (Q) `AB_(4)` (R) `AB_(5)` (S) `AB_(6)^(-)`A. P,Q,RB. Q,R,SC. R,S,PD. S,P,Q |
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Answer» Correct Answer - B `AB_(5)` has one lone pair at (A), so it will be polar. |
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| 462. |
The element californium belongs to a familt ofA. Actinide seriesB. Alkali metal familyC. Alkaline earth familyD. Lanthanide series |
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Answer» Correct Answer - A |
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| 463. |
The general electronic configuration elements of carbon familyA. `ns^(2)np^(4)`B. `ns^(2)np^(3)`C. `ns^(2)np^(1)`D. `ns^(2)np^(2)` |
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Answer» Correct Answer - D |
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| 464. |
Transition metals are often paramagnetic due toA. Their high m.p. and b.pB. The presence of vacant d-orbitalsC. The presence of one or more unpaired d-electronsD. Their being less electropositive than the elements of groups IA and IIA |
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Answer» Correct Answer - C |
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| 465. |
The electron configuration of the starting and ending elements of fourth period areA. `4s^(1)` and `3d^(10) 4s^(2) 4p^(6)`B. `4s^(1)` and `4s^(2) 3d^(10)`C. `4s^(2) 3d^(1)` and `4s^(2) 4p^(6)`D. `4s^(2) 3d^(1)` and `4s^(2) 3d^(10)` |
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Answer» Correct Answer - A |
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| 466. |
The number of elements present in the fourth period isA. 32B. 18C. 8D. 2 |
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Answer» Correct Answer - B |
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| 467. |
Which of the following is the correct order of ionisation energy? (1) `Be^(+) gt Be` (2) `Be gt Be^(+)` (3) `C gt Be` (4) `B gt Be`A. 2,3B. 3,4C. 1,3D. 1,4 |
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Answer» Correct Answer - C (1) `Be` has completely filled stable valence shell configuration i.e. `2s^(2)` while in `Be^(+)` because of positive charge, the removal of electron requires much higher energy. So, ionisation energy of `Be^(+)` is greater than `Be` (3) Across the period, atomic size decreases and nuclear charge increases and thus valence shell electron(s) is//are tightly held by nucleus. So, ionisation energy of `C` is greater than `Be`. |
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| 468. |
The correct order of radii is:A. `N lt Be lt B `B. `F^(-) lt O^(2-) lt N^(3-)`C. `Fe^(3+) lt Fe^(2+) lt Fe^(4+)`D. `N lt Li lt K` |
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Answer» Correct Answer - B |
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| 469. |
Which of the following is the correct order of ionisation energy? (1) `Be^(+) gt Be` (2) `Be gt Be^(+)` (3) `C gt Be` (4) `B gt Be`A. 2,3B. 3,4C. 1,3D. None of these |
| Answer» Correct Answer - C | |
| 470. |
The set representing the correct order of the first ionisation potential isA. `K gt Na gt Li`B. `Be gt Mg gt Ca`C. `B gt C gt N`D. `Ge gt Si gt C` |
| Answer» Correct Answer - B | |
| 471. |
The incorrect statement Among the following isA)The first ionisation potential of Al is less than the first ionisation potential of Mg.B)The first ionisation potential of Na is less than the first ionisation potential of Mg.C)The second ionisation potential of Mg greater than the second ionisation potential of NaD)The third ionisation potential of Mg greater than the third ionisation potential of AlA. the `IE_(1)` of AI is less than `IE_(1)` of MgB. the `IE_(2)` of Mg is less than `IE_(2)` of `Mg`C. the `IE_(1)` of Na is less than `IE_(1)` of MgD. the `IE_(3)` of `Mg` is less than `IE_(3)` of AI |
| Answer» Correct Answer - B | |
| 472. |
The incorrect statement Among the following isA)The first ionisation potential of Al is less than the first ionisation potential of Mg.B)The first ionisation potential of Na is less than the first ionisation potential of Mg.C)The second ionisation potential of Mg greater than the second ionisation potential of NaD)The third ionisation potential of Mg greater than the third ionisation potential of AlA. The first ionisation potential of Al is less than the first ionisation potential of Mg.B. The first ionisation potential of Na is less than the first ionisation potential of Mg.C. The second ionisation potential of Mg greater than the second ionisation potential of Na.D. The third ionisation potential of Mg greater than the third ionisation potential of Al |
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Answer» Correct Answer - C |
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| 473. |
The number of elements known when Mendeleef presented periodic table isA. 50B. 90C. 63D. 102 |
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Answer» Correct Answer - C |
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| 474. |
Considering the chemical properties, atomic weight of Be was corrected based onA. Electronic configurationB. ValencyC. Atomic numberD. Both 2 and 3 |
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Answer» Correct Answer - B |
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| 475. |
Zero group was introduced byA. Lother MeyerB. MendeleefC. RamsayD. Lockyer |
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Answer» Correct Answer - C |
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| 476. |
The units of Electron Affinity areA. k cal/ moleB. erg. SecC. `A^(@)`D. no units |
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Answer» Correct Answer - A |
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| 477. |
The first ionization energy of lithium will beA. Greater than BeB. Less than BeC. Equal to that of NaD. Equal to that of F |
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Answer» Correct Answer - B |
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| 478. |
Which pair of elements of atomic numbers given below will have similar chemical propertiesA. 13, 22B. 3, 11C. 4, 24D. 2, 4 |
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Answer» Correct Answer - B |
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| 479. |
Element with lowest and highest I.P values in each period respectively.A. Alkali metals, Noble gasesB. Alkali metals, HalogensC. Halogens, AlkalimetalsD. Noble gases, Alkalimetals |
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Answer» Correct Answer - A |
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| 480. |
If the same element is forming oxides in different oxidation states then :a)that oxide will be neutral in nature in which element will be in its highest oxidation state.b)that oxide will be highest acidc in nature in which element will be in its highest oxidation state.c)that oxide will be amphoteric in nature in which element will be in its highest oxidation stated)that oxide will be highly basic in nature in which element will be in its highest oxidation state.A. that oxide will be neutral in nature in which element will be in its highest oxidation state.B. that oxide will be highest acidc in nature in which element will be in its highest oxidation state.C. that oxide will be amphoteric in nature in which element will be in its highest oxidation state.D. that oxide will be highly basic in nature in which element will be in its highest oxidation state. |
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Answer» Correct Answer - B |
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| 481. |
Compare the following giving reasons Acidic nature of oxides: `CaO, CO, CO_(2),N_(2)O_(5),SO_(3)` |
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Answer» Correct Answer - `[CaO lt CO lt CO_(2) lt N_(2)O_(5) lt SO_(3)]` `[CO rarr` Neutral oxide `CaO rarr` Basic oxide Audic natural `prop phi`] |
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| 482. |
The first element of a group in many ways differ from the heavier memebers of group. This is due toa)the small sizeb)the high electronegativityc)high ionisation potentiald)the unavailability of d-orbitalsA. the small sizeB. the high electronegativityC. high ionisation potentialD. the unavailability of d-orbitals |
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Answer» Correct Answer - A::B::C::D |
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| 483. |
Which of the following should be the order of increasing values of second ionisation potential of `C_(6),N_(7),O_(8)` and `F_(9)`A. `C gt N gt F gt O`B. `C lt F lt N lt O`C. `C lt F lt N lt O`D. `C lt N lt F lt O` |
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Answer» Correct Answer - D The second ionisation potential means removal of electron from a cation `C^(+1) (5e) = 1s^(2),2s^(2),2p^(1)` `N^(+1) (6e) = 1s^(2),2s^(2),2p^(2)` `O^(+1) (7e) = 1s^(2),2s^(2),2p^(3)` `F^(+1) (8e) = 1s^(2), 2s^(2), 2p^(4)` Therefore `C lt N lt F lt O` |
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| 484. |
Calculate the bond length of `C-X` bond, if `C-C` bond length is `1.54 Å, X -X` bond length is `1.00 Å` and electronegativity values of `C` and `X` are `2.0` and `3.0` respectively. |
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Answer» (1) `C-C` bond length `=1.54 Å` `r_(C) = (1.54)/(2) = 0.77 Å` `r_(X) = (1.00)/(2) = 0.05 Å` ltbr. (2) `C-X` bond length ltbr. `d_(C_X) = r_(C) +r_(X) - 0.09 |X_(X) - X_(C)|` `= 0.77 +0.50 - 0.09 |3-2| = 0.77 +0.50 - 0.09 xx 1 = 1.27 - 0.09 = 1.18 Å` Thus `C-X` bond length is `1.18 Å` |
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| 485. |
Which one of the following arrangements is the incorrect representation of the property indicated with it ?A. `Br lt Cl lt F ` : ElectronegativityB. `F lt Br lt Cl` : Electron - affinityC. `F_(2) lt Br_(2) lt Cl_(2)` : Bond energyD. `Br_(2) lt Cl_(2) lt F_(2)` : Oxidising strength |
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Answer» Correct Answer - B |
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| 486. |
The electronegativity of `K=0.8` and `Cl=3.0`. The type of bond formed between "K" and "Cl" isA. Pure covalent bondB. Hydrogen bondC. Metallic bondD. Electrovalent bond |
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Answer» Correct Answer - D |
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| 487. |
The C-C single bond length is `1.54 A^(@)` and that of Cl-Cl is `1.98 A^(@)` . If the electronegativity of Cl and C are `3.0` and `2.5` respectively , the C-Cl bond -length will be equal toA. `3.12 A^(@)`B. `1.67 A^(@)`C. `1.71 A^(@)`D. `2.12 A^(@)` |
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Answer» Correct Answer - C |
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| 488. |
Calculate the bond length of `C-X` bond, if `C-C` bond length is `1.54 Å, X -X` bond length is `1.00 Å` and electronegativity values of `C` and `X` are `2.0` and `3.0` respectively.A. `1.27 Å`B. `1.18 Å`C. `1.08 Å`D. `1.28 Å` |
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Answer» Correct Answer - B |
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| 489. |
Choose the correct statement .A. Ce , Gd , U are LanthanoidsB. Cu , Ag , Au are known as coinage metalsC. Li is strongest reducing agent in aq`.` solutionD. Reducing character decreases down the group |
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Answer» Correct Answer - B::C |
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| 490. |
Which of the following is/are correct statements (s) .A. All the actinide elements are radio activeB. Alkali and Alkaline earth metals are s-block elementsC. Chalcogens and halogens are p-block elementsD. The first member of the lanthanide series is lanthanum |
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Answer» Correct Answer - A::B::C |
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| 491. |
Which of the following statement(s) is/are trueA. ionisation energy `prop (1)/("Screening effect")`B. The first ionisation energies of Be and Mg are more than ionisation energies of B and Al respectivelyC. Atomic and ionic radii of Niobium and Tantalum are almost sameD. Metallic and covalent radii of potassium are `2.3 A^(@)` and `2.03 A^(@)` respectively . |
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Answer» Correct Answer - A::B::C::D |
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| 492. |
The statement which is not correct for periodic classification of elements isA. The properties of elements are a periodic function of their atomic numbersB. Non-metallic elements are less in number than metallic elementsC. The first ionisation energies of elements along a period of vary in a regular manner with increase in atomic numberD. Generally electronegativity and electron affinity increase across the period |
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Answer» Correct Answer - C |
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| 493. |
Consider the `M(OH)_(3)` formed by all the group 13 elements. The correct sequence of acidic strength of hydroxides `[M(OH)_(3)]` is-A. `B(OH)_(3) lt AI(OH)_(3) gt Ga(OH)_(3) gt ln(OH)_(3) gt TI(OH)_(3)`B. `B(OH)_(3) gt Tl(OH)_(3) gt Al(OH)_(3) gt ln(OH)_(3) gt Ga(OH)_(3)`C. `Al(OH)_(3) gt Ga(OH)_(3) gt B(OH)_(3) gt ln(OH)_(3) gt Tl(OH)_(3)`D. `B(OH)_(3) gt Al(OH)_(3) gt Ga(OH)_(3) gt ln(OH)_(3) gt Tl(OH)_(3)` |
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Answer» Correct Answer - D [Down the group metallic character increases, acidic strength decreases down the group] |
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| 494. |
Chalcogens are elements of:A. group 16B. p-blockC. `ns^(2)np^(4)` configurationD. all are correct |
| Answer» Correct Answer - D | |
| 495. |
Which of the following are wrong?A. Noble gases have highest IE in respective periodsB. ZnO is amphoteric oxideC. Ionic radius is inversely proportional to effective nuclear chargeD. Zn, Cd, Hg have high boiling points among d-block elements |
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Answer» Correct Answer - D |
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| 496. |
The correct order of radii isA. `N lt Be lt B `B. `F^(-) lt O^(2-) lt N^(3-)`C. `Fe^(3+) lt Fe^(2+) lt Fe^(4+)`D. `N lt Li lt K` |
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Answer» Correct Answer - B |
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| 497. |
In a period, elements are arranged in strict sequence ofA. Decreasing charges in the nucleusB. Increasing charges in the nucleusC. Constant charges in the nucleusD. Equal charges in the nucleus |
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Answer» Correct Answer - B |
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| 498. |
The incorrect statement Among the following isA. The first ionisation potential of Al is less than the first ionisation potential of Mg.B. The first ionisation potential of Na is less than the first ionisation potential of Mg.C. The second ionisation potential of Mg greater than the second ionisation potential of Na.D. The third ionisation potential of Mg greater than the third ionisation potential of Al |
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Answer» Correct Answer - C |
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| 499. |
Which of the following remains unchanged in descending in a group in the periodic table?A. Valence electronsB. Atomic sizeC. DensityD. Metallic character |
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Answer» Correct Answer - A |
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| 500. |
The decreasing order of the second ionisation potential of K , Ca and Ba is (At. No : K = 19 , Ca = 20 , Ba = 56)A. `K gt Ca gt Ba `B. `Ca gt Ba gt K `C. `Ba gt K gt Ca `D. `K gt Ba gt Ca ` |
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Answer» Correct Answer - A |
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