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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.
| 351. |
Assertion . The resonance hybrid is more stable than any of the contributing structure . Reason . The contributing structures contain the same number of umpaired elelctrons and have the real existance.A. If both assertion and reason are correct, and reason is the correct explanation of the assertion.B. If both assertion and reason are correct , but reason is not the correct explanation of the assertion.C. If assertion is correct, but reason is incorrect .D. If both assertion and reason are incorrect. |
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Answer» Correct Answer - c Correct R . The contributing structures contain the same number of upraired elecrons but do not have real existence . |
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| 352. |
The stability of ionic crystal depends principally onA. High electron affinity of anion forming speciesB. The lattice energy of crystalC. Low I.E. of cation forming speciesD. Low heat of sublimation of cation forming solid. |
| Answer» Correct Answer - B | |
| 353. |
In the metallic crystalA. the valence electrons remain within the field of influence of their own kernelsB. the valence electrons constitute a sea of mobile electronsC. the valence electrons are localised between the two kernelsD. both kernels as well as electrons move rapidly |
| Answer» Correct Answer - B | |
| 354. |
What structural units occupy the lattice sites in the metallic crystals ?A. AtomsB. ElectronsC. Negative ionsD. Metal kernels |
| Answer» Correct Answer - D | |
| 355. |
The interparticles forces in liquid hydrogen areA. H-bondsB. van der Waals forcesC. Covalent bondsD. None of these |
| Answer» Correct Answer - B | |
| 356. |
In solid argon the atoms are held byA. ionic bondsB. hydrogen bondsC. van der Waals forcesD. co-ordinate bonds. |
| Answer» Correct Answer - C | |
| 357. |
Hydrogen fluoride is a liquid unlike other hydrogen halides becauseA. HF molecules associate due to hydrogen bondingB. `F_2` is highly reactiveC. HF is the weakest acid of all hydrogen halidesD. Fluorine atom is the smallest of all halogen |
| Answer» Correct Answer - A | |
| 358. |
Assertion : The atoms in a covalent molecule are said to share electrons, yet some covalent molecule are polar. Reason :In a polar covalent molecule , the shared electron spend more time on the average near one of the atoms .A. If both assertion and reason are true and the reason is a true explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. if assertion is false but reason is true. |
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Answer» Correct Answer - a Polarity in conalent bond developed due to shifting of electron toward one of the bonded atoms . |
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| 359. |
Assertion : `sigma`-bond is strong white `pi` -bond is a weak bond. Reason :Atomic rotate freely about `pi`-bond.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - c Rotation is hindered around `pi` - bond |
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| 360. |
Assertion : Water is a good solvent for ionic compounds but poor one for covalent compounds. Reason :Hydrogen energy of ions realeases sufficient energy to overcome lattice energy and break hydrogen bonds in water, white covalent bonded compound interact so weakly that even van der walls force between molecule of convalent compounds cannot be broken .A. If both assertion and reason are true and the reason is a true explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. if assertion is false but reason is true. |
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Answer» Correct Answer - a Solubility depole on hydration energy and lattice energy . |
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| 361. |
Assertion : Water is a good solvent for ionic compounds but poor one for covalent compounds. Reason :Hydrogen energy of ions realeases sufficient energy to overcome lattice energy and break hydrogen bonds in water, white covalent bonded compound interact so weakly that even van der walls force between molecule of convalent compounds cannot be broken .A. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`B. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`C. If `(A)` is correct but `(R )` is incorrectD. If `(A)` is incorrect but `(R )` is correct |
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Answer» Correct Answer - A Ionic compounds interact with water molcules since water has high dielectric constants and ions get hydrated It is not possible in case of covalent compounds . |
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| 362. |
Write the molecular orbital electron distribution of oxygen `(O_(2))` Specify its bond order and magnetic property Fill in the blanks When `N_(2) ` goes to `N_(2)^(o+)`, the `N-N` bond distance___ and when `O_(2)` goes to `O_(2)^(o+)` the `O-O` bond distance ____ . |
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Answer» `O_(2):KK^(**) (sigma2s)^(2) (sigma^(**) 2p_(z))^(2) (pi 2p_(x))^(2) (pi 2p_(y))^(2)` `(pi^(**)2p_(x))^(1) (pi ^(**) 2p_(y))^(1)` Bond order ` =(1)/(2) (8-4)` The molecule is paramagnetic due to two unpaired electrons in `(pi^(**) 2p_(x))^(1) (pi ^(**)2p_(y))^(1)` (b) Increases, decreases . |
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| 363. |
In which pair of species both species do have the similar geometry ? .A. `CO_(2),SO_(2)`B. `NH_(3),BH_(3)`C. `CO_(3)^(2-),NO_(2)^(-)`D. `SO_(4)^(2-),CIO_(4)^(Θ)` |
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Answer» Correct Answer - D Hybridisation of `SO_(4)^(2-) implies (1)/(2) (6 +0 +2) =4 = sp^(3)` and is `TH` Hybridisation of `CIO_(4)^(Theta) implies (1)/(2) (7 +0 +2) = 4= sp^(3)` and is `TH` . |
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| 364. |
Most covalent compound among the followingA. LiClB. BeOC. NaClD. MgO |
| Answer» Correct Answer - B | |
| 365. |
Which of the following elements has the strongest tendency to form electrovalent compound ?A. LiB. NaC. BeD. Mg |
| Answer» Correct Answer - B | |
| 366. |
An electrovalent bond is formed betweenA. Two electronegative atomsB. Two metalsC. Electropositive and electronegative atomsD. Two electropositive atoms |
| Answer» Correct Answer - C | |
| 367. |
The bond angle in `H_(2)S "is" 92^(@)`. It suggest that :A. hybridised state of S atom is `sp^(2)`B. bond pair-bond pair repulsions are more due to large size of S atomC. lone pair-lone pair repulsions are greater than bonds pair-bond pair repulsionD. Bonds are more or les purely `pi`-bonds. |
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Answer» Correct Answer - C is the correct answer. |
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| 368. |
Which of the following species has tetrahedral geometry ?A. `BH_(4)^(-)`B. `NH_(2) ^(-)`C. `CO_(3) ^(2-)`D. `H_(3) O^(+)` |
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Answer» Correct Answer - A `BH_(4)^(-)` = trtrahedral , `NH_(2)^(-)` = V-shape , `CO_(3)^(2-)` = tringular planar, `H_(3)O ^(+)` = pyamidal ( Follow the method given in Table 4.7 or on page 4/52). |
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| 369. |
The critical temperature of water is higher than that of `O_(2)` because the `H_(2)O` molecule hasA. A fewer electrons than `O_(2)`B. A dipole momnentC. a `V` shape structureD. Two covalent bonds |
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Answer» Correct Answer - B Cricical temperature of `H_(2)O` is higher than `O_(2)` because `H_(2)O` molecule has dipole momnet which is due to its V-shape . |
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| 370. |
The molecular formula of the compound formed from B and C will be :A. BCB. `B_(2)C`C. `BC_(2)`D. `BC_(3)` |
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Answer» Correct Answer - D The molecular formula will be `BC_(3).` The compound is `PCl_(3)` |
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| 371. |
Write the Lewis dot symbole of the following atoms and ions : S and `S^(2-)` ,P and `P^(3-)` , Na and `Na^(+)` , Al and `Al^(3+)` , H nad `H^(-)` |
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Answer» `underset(* *)(":"S":")and "["overset(* *)underset(* *)(":"S":")"]"^(2-), overset(* *)underset(*)("."P".")and "["overset(* *)underset(* *)(":"P":")"]"^(-3)` `overset(*)Na and [Na]^(+) , overset(*)("."A".")and [Al]^(3+), overset(*)Hand [overset(*)("."H)]^(-)` |
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| 372. |
Assertion :A molecule of Buckminsterfullerene exhibita aromatic character. Reason :All the carbon atom undergo `sp^(2)` hybridisation. Each carbon atom atomic three sigma bonds with other three carbon atom. The remaining electron at each carbon is delocalised in molecular orbitals.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - a Both statement are true and the Reason is the true explation of Assertion. Fullerenes: it contain `20` six membered rings and `12` five membered ring .A six mnembered ring is fixed can six or five membered rings but a five membered ring can only fase with six membered ring .All the carbon atom forms three sigma bond with other three carbon is delocallised in molecular orbital , which in true give atomatic character to molecular .This ball shaped molecular has `60` verticle and each one each one is occopied by one carbon atom and it also contain both single by double with C- C distance of `143.5 pm` and `138.3` respectively. |
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| 373. |
Stable from of C may be represented by the formula :A. CB. `C_(2)`C. `C_(3)`D. `C_(4)` |
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Answer» Correct Answer - B Is the stable form of element C. It is actually `Cl_(2).` |
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| 374. |
Stable from of A may be represented by the formula :A. AB. `A_(2)`C. `A_(3)`D. `A_(4)` |
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Answer» Correct Answer - A is correct answer. |
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| 375. |
Among the following Ca ,Mg, P and CI the order of increasing atomic radius isA. `Mg lt Ca lt CI lt P`B. `Cl lt P lt Mg lt Ca`C. `P lt Cl lt Ca lt Mg`D. `CaltMgltPltCl` |
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Answer» Correct Answer - b Along the period , the atomic radius decreases and when we move down the group atomic radius increases `rArr` The increasing order of atomic radius is `CI lt P lt Mg lt Ca`. |
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| 376. |
Among the following which has the highest cation to anion size ratio ?A. CsIB. CsFC. LiFD. `NaF` |
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Answer» Correct Answer - b `Cs^(+)` is the largest cation and F is the smaller anion. |
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| 377. |
In which pair of species, both species have similar geometry ?A. `CO_(2), SO_(2)`B. `NH_(3), BH_(3)`C. `CO_(3)^(2-),SO_(3)^(2-)`D. `SO_(4)^(2-) and CIO_(4)^(-)` |
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Answer» Correct Answer - D `CO_(2) to` linear, `SO_(2) to ` bent, `NH_(3) to ` pyramidal , `BH_(3) to ` does not exist , `CO_(3)^(2-) to ` triangular planar, `SO_(3)^(2-) to ` pyramidal , `SO_(4)^(2-), ClO_(4)^(-) to ` bond tetrahedral. |
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| 378. |
In the formation of ethylene molecule , the carbon atom makes use ofA. `sp^(3)` hybridisationB. `sp^(2)` hybridisationC. sp hybridisationD. `dsp^(2)` hybridisation |
| Answer» Correct Answer - B | |
| 379. |
Write the Lewis dot symbols of the following elements : Be, Na, B, O, N, Br. |
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Answer» Please remember that only the valence electrons are shown in the Lewis dot symbols of the atoms of the elements. `overset(*)underset(*)Be, overset(*)Na, overset(*)("."B".",)overset(* *)underset(* *)("."O".",) overset(* * )underset(*)("."N".",)overset(* *)underset(* *)("."Br":")` |
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| 380. |
Incorrect statement isA. Hybridisation is intermixing of orbitals of nearly equal energiesB. Hybrid orbitals are identical in all respectC. Hybrid orbitals can form `sigma ` bond and `pi`bondD. Shape of molecule depends upon type of hybridisation only |
| Answer» Correct Answer - D | |
| 381. |
In which of the following molecule in the bond angle is maximum ?A. `CH_(4)`B. `H_(2)O`C. `NH_(3)`D. `CO_(2)` |
| Answer» Correct Answer - D | |
| 382. |
Which one among the following does not have the hydrogen bond?A. PhenolB. Liquid `NH_(3)`C. WaterD. HCl |
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Answer» Correct Answer - D No hydrogen bonding is present in HCl. |
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| 383. |
A molecule possessing dipole moment isA. `CH_(4)`B. `H_(2)O`C. `BF_(3)`D. `CO_(2)` |
| Answer» Correct Answer - B | |
| 384. |
Which one of the following has pyramid shape ?A. `NH_(3)`B. `SiF_(4)`C. `H_(2)O`D. `BF_(3)` |
| Answer» Correct Answer - A | |
| 385. |
Carbon tetrachloride has no net dipole moment because ofA. its planar structureB. its regular tetrahedral geometryC. similar sizes of carbon and chlirine atomsD. similar electron affinities of carbon an chlorine. |
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Answer» Correct Answer - B `C Cl_(4)` hag regular tetrahedral geometry. |
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| 386. |
Using `MOT` predict which of the following species has the shortest bond length ? .A. `O_(2)^(2o+)`B. `O_(2)^(Θ)`C. `O_(2)^(2-)`D. `O_(2)^(o+)` |
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Answer» Bond orders of `O_(2)^(2+), O_(2)^(o+) ,O_(2)^(Θ)` and `O_(2)^(2-)` are `3,2.5,1.5` and 1.0 respectively and bond order `prop (1)/("Bond length")` Hence `O_(2)^(2+)` has the shortest bond length . |
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| 387. |
Which of the molecule has p-p overlapping ?A. `Cl_(2)`B. `HCl`C. `H_(2)O`D. `NH_(3)` |
| Answer» Correct Answer - A | |
| 388. |
Hybridisationof sulphur in `So_(2)` is :A. spB. `sp^(2)`C. `sp^(3)`D. `dsp^(2)` |
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Answer» Correct Answer - B `H = 1//2[6+0-0+0]=6//2=3(sp^(2)).` |
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| 389. |
Statement-1 : `H_(2)O` is liquid whereas `H_(2)S` is gas . and Statement-2 : Oxygen is more electronegative than sulphur .A. Statement-1 is True , Statement-2 is True , Statement-2 is a correct explanation for Statement-7B. Statement-1 is True , Statement-2 is True , Statement-2 is NOT a correct explanation for Statement-7C. Statement-1 is True , Statement-2 is FalseD. Statement-1 is False , Statement-2 is True |
| Answer» Correct Answer - B | |
| 390. |
Which of the following pairs have same hybridisation ?A. `CH_(3)^(-)` and `CH_(3)^(+)`B. `NH_(3)` and `SO_(2)`C. `SO_(4)^(2-)` and `BF_(4)^(-)`D. `BF_(3)` and `NF_(3)` |
| Answer» Correct Answer - C | |
| 391. |
Which p-orbitals overlapping would give the strongest bond?A. B. C. D. |
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Answer» Correct Answer - c Head to head overlapping leads to strongest bond |
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| 392. |
Carbon tetrachloride has no net dipole moment because ofA. Its planar structureB. Its regular tetrahedral structureC. Similar sizes of carbon and chlorine atomsD. Similar electron affinities of carbon and chlorine . |
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Answer» Correct Answer - B In regular tetrahedral structure, dipole momnent of one bond is cancelled by oppsite dipole moment of the other bonds . |
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| 393. |
How do you express the bond length in terms of bond order ? |
| Answer» Greater the bond order , shorter in the bond length. | |
| 394. |
In an octahedral structure , the pair of d orbitals involved in `d^(2)sp^(2)` hybridization isA. `d_(x^(2) - y^(2)) ,d_(z^(2)`B. `d_(xz),d_(x^(2)- y^(2))`C. `d_(z^(2)),d_(xz)`D. `d_(xy),d_(yz)` |
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Answer» Correct Answer - a Only thoes d orbital whose lobes are directed along X-,Y- and Z- directions hybridise with s and p orbitals . In other three d orbital `d_(xy) d_(xz) and d_(xz)` the extent of their overlap with x and y orbitals is much lesser than `d_(x^(2) - y^(2))` and `d_(x^(2)` orbitals. |
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| 395. |
How do you express the bond strength in terms of bond order? |
| Answer» Bond strength represents the extent of bonding between two atoms forming a molecule. The larger the bond energy, the stronger is the bond and the greater is the bond order. | |
| 396. |
The correct order of increasing bond length of C - H ,C - O, C - C and C = C isA. `C-H lt C- O lt C - C lt C = C`B. `C-H lt C= C lt C - O lt C - C`C. `C-C lt C= C lt C - O lt C - H`D. `C-OltC-HltC-CltC=C` |
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Answer» Correct Answer - b The bond length are `underset(107"pm")(C-H)ltunderset(134 "pm")(C=C)ltunderset(141"pm")(C-O)ltunderset(154"pm")(C-C)` |
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| 397. |
Which of the following statements is correct ?A. In the formation of dioxygen form oxygen atoms, 10 molecular orbitals will be formed.B. All the molecular orbitals in the dioxygen will be completely filledC. Total number of bonding molecular orbitals will not be same as total number of antibonding orbitals in dioxygen.D. Number of filled bonding orbitals will be same as number of filled antibonding orbitals |
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Answer» Correct Answer - a ` O_2 = sigma_((1s)/(1))^(2) sigma_((1s)/(3)) ^(**2) sigma_((2s)/(3))^(2)sigma_((2s)/(4))^(**2)sigma_((2p_(z))/(5))^(2)pi_((2p_(x))/(6))^(2) pi_((2p_(y))/(7))^(2)pi_((2p_(x))/(8))^(**1) pi_((2p_(y))/(9))^(**1)sigma _((2p_(z))/(10))^(**0)` |
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| 398. |
The maximum number of hydrogen bonds that a water molecule can form isA. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - D Each `H_(2)` molecule can form two H-bond through O-atom and two H-bonds through two H-atoms |
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| 399. |
Which of the following molecular orbitals has maximum number of nodal planes ?A. `sigma^(**)1s`B. `sigma^(**)2p_(z)`C. `pi^(**) 2p_(x)`D. `pi^(**) 2p_(y)` |
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Answer» Correct Answer - D Nodal plances are : ` sigma _(1s)^(**) = 1, sigma _(2_(pz))^(**) = 1, pi_(2p_(x) = 1, pi_(2_(p_(y)))^(**)= 2` |
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| 400. |
The central bond in 1,3 butadience is_______than that of n-butane . |
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Answer» Correct Answer - Shorter Shorter (Due to reasonacne in conjugated diene) |
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