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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.
| 401. |
Which of the following `MO` s have one nodal plane ? .A. `sigma 1s`B. `sigma^(**) 1s`C. `sigma 2p_(z)`D. `sigma^(**)2p_(z)` |
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Answer» Correct Answer - B::D All bonding `piMO` s and antibonding `sigma ^(**) MO s` and `overset(**)sigma 2p_(z)` have one nodal plane |
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| 402. |
Match the species in Column I with the geometry/shape in Column II. |
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Answer» (A-5), (B-1), (C-2), (D-3) A. `H_(3)O^(+)` = 3bp +`1/p` pyramidal shape. B) HC`-=`CH`rArr` linear as sp hybridised shape. C) `CIO_(2)^(-)=2bp + 2Ip rArr` angular shape. D) `NH_(4)^(+)=4bp+0//p rArr` tetrahedral shape. |
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| 403. |
`BeF_(2)` and `H_(2)O` are both tri-atomic molecules but have different shapes. Discuss. |
| Answer» According to VSEPR theory, the geometry and shape of a covalent molecule does not depend upon the number of atoms but on the number of the electron pairs aroungd the central atom. Molecules with different number of such electron pairs are expected to have different shapes. In `BeF_(2),` the Be atom is surrounded by two electron pairs while four pairs are present around O atom in `H_(2)O.` Therefore, they have different shapes. | |
| 404. |
`XeF_(2)` is iso-structural with :A. `BaCl_(2)`B. `TeF_(2)`C. `lCl_(2)^(-)`D. `SbCl_(3).` |
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Answer» Correct Answer - C `XeF_(2),H=^(1//2)[7+2-0+0]=5(sp^(3)d)` `lCl_(2)^(-),H=^(1//2)[7+2-0+1]=5(sp^(3)d)` |
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| 405. |
Compara the relative stablilties of `O_(2)^(-) and N_(2)^(-)` and comment on their magnetic (paramagetic or diamagnetic ) behaviour. |
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Answer» M.O. Electronic configuration of ` O_(2)^(-) = KK sigma _(2s)^(2) sigma _(2)^(**2) sigma _(2p_(z) p)^(2) pi_(2p_(x))^(2) pi_(2p_(y))^(2) pi_(2p_(x))^(**2) pi_(2p_(y))^(**1)` Bond order = ` (1)/(2) (8-5) = (3)/(2) = 1.5 ` M.O. Electronic configuration of ` O_(2)^(-) = KK sigma _(2s)^(2) sigma _(2)^(**2) pi_(2p_(x))^(2) pi_(2p_(y))^(2) pi_(2p_(z))^(1)` Bond order `= (1)/(2) (7-2) = (5)/(2) = 2.5 ` |
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| 406. |
The structure of `CH_(2)=C=CH_(2)` is :A. linearB. planarC. non-planarD. has several resonating structures |
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Answer» Correct Answer - A is linear because the central carbon atom is sp hybridised. |
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| 407. |
Which of the following pairs are iso-structural ?A. `XeF_(2),lF_(2)^(-)`B. `NH_(3),BF_(3)`C. `CO_(3)^(2-),SO_(3)^(2-)`D. `PCl_(5),lCl_(5)` |
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Answer» Correct Answer - A `XeF_(2) and lF_(2)^(-)` are iso-structural because both Xe and l atoms are `sp^(3)`d hybridised. |
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| 408. |
The `H-O-H` bond angle in water isA. `105^(@)`B. `102^(@)`C. `180^(@)`D. `90^(@)` |
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Answer» Correct Answer - A is the correct answer |
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| 409. |
Which is a square planar molecule ?A. `XeF_(6)`B. `XeF_(4)`C. `XeOF_(4)`D. `XeOF_(2)F_(4)` |
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Answer» Correct Answer - B `XeF_(4)` has square planar geometry. |
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| 410. |
Number of `H_(2)` molecules attached to each `H_(2)O` molecule through hydrogen bonding is |
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Answer» Correct Answer - 4 Each `H_(2)` molecule is linked to 4 other molecules tetrahedrally . |
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| 411. |
The types of hybrid orbitals of nitrogen in `NO_(2)^(+), NO_(3)^(+) and NH_(4)^(+)` respectively are expented to be :A. `sp,sp^(2)and sp^(2)`B. `sp,sp^(2)and sp^(3)`C. `sp^(2),spand sp^(3)`D. `sp^(2),sp^(3)and sp` |
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Answer» Correct Answer - B `NO_(2)^(+):H=^(1//2)[5+0-1+0]=2(sp)` `NO_(3)^(-):H=^(1//2)[5+0-0+1]=6(sp^(2))` `NO_(4)^(+):H=^(1//2)[5+4-1+0]=4(sp^(3))` |
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| 412. |
A neutral molecule `XF_(3)` has a zero diple moment. The element X is most likely :A. chlorineB. boronC. nitrogenD. carbon |
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Answer» Correct Answer - B The element is B. the compound `BF_(3)` has zero dipole moment. |
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| 413. |
Which property is due to H-bonding ? .A. High boiling point of waterB. Solubility of `NH_(3)` in `H_(2)O`C. Polar nature of halogen acidD. High viscosity of `H_(3)PO_(4)` |
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Answer» Correct Answer - A::B::C (c ) is not correct as polar nature of `HX` is due to `EN` difference between the bonding atoms . |
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| 414. |
The number of water molecule (s) directly bonded to the metal centre in `CuSO_(4) .5 H_(2) O` is |
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Answer» Correct Answer - 4 `(4 H_(2) O` molecular are directily bonded to Cu ) |
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| 415. |
Polarizing power ` Cd^(2+)` on the anions is stronger then that of `Ca^(2+)` ion. This is becauseA. atomic number of Cd is greater than that of CaB. atomic mass of Cd is greater than that CaC. size of `Cd^(2+) `ion is larger than that of `Ca^(2+)` ionsD. `Ca^(2+)` ions has noble gas configuration white `Cd^(2+)`ion has pseudo noble gas configuration with 18 electrons in its outer shell |
| Answer» Correct Answer - D | |
| 416. |
Which of the following hydrogen halide is liquid at room temperature ?A. HFB. HClC. HBrD. HI |
| Answer» Correct Answer - A | |
| 417. |
How many hydrogen bonded water molecule(s) are associated with `CuSO_(4) .5 H_(2)O` ?A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - A Only one `H_(2) O` molecule is linked through hydrogen bonds . |
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| 418. |
The highest amount of s-character is observed in :A. `N - H` hond of `NH_(3)`B. `N - H` bond of `NH_(4)^(+)`C. `N-H` bond in `underset(("Hydrazine"))(H_(2)N NH_(2))`D. `N-H` bond in `underset(("Diazene"))(HN=NH)` |
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Answer» Correct Answer - d N-H bond of diazene is formed by sp- hybridsed orbital of nitrogen |
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| 419. |
Which among the following has smallest bond angle ?A. `H_(2)S`B. `NH_(3)`C. `SO_(2)`D. `H_(2)O` |
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Answer» Correct Answer - a Bond angle of `SO_(2)H_(2)OH_(2)S and NH_(3) are 119.5^(@), 104.5,92.5^(@) and 106.5^(@)` respectively. |
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| 420. |
Which of the following pair is expected to have the same bond order ?A. `O_(2), N_(2) `B. `O_(2)^(+) , N_(2) ^(-)`C. `O_(2)^(-) , N_(2)^(+)`D. `O_(2)^(-), N_(2) ^(-)` |
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Answer» Correct Answer - B Bond orders are : ` O _(2) = 2, N_(2) = 3, O_(2)^(+) = 2.5, N_(2)^(-) = 2.5 , O_(2)^(-) = 1.5 , N_(2) ^(-) = 2.5 ` . |
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| 421. |
Which of the following have Identfical bond order ?A. `CN^(-)`B. `NO^(+)`C. `O_(2)^(-)`D. `O_(2)^(2-)` |
| Answer» Correct Answer - A::B | |
| 422. |
Which one is the highest melting halide ?A. NaCIB. NaBrC. NaFD. Nal |
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Answer» Correct Answer - c NaF is the structure ionic crystal so its melting point would be highest |
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| 423. |
Which of the following hydrogen halide is most volatile ?A. HFB. HClC. HBrD. HI. |
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Answer» Correct Answer - B Most valatile hydrogen hailde is the one which has least boiling point , viz , HCl . |
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| 424. |
Which of the following hydrogen halide is most volatile.A. HFB. HClC. HBrD. Hl. |
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Answer» Correct Answer - B HCl is the maximum volatile as its boiling point is the minimum (189K) |
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| 425. |
Group the following as linear and non-linear molecules : `H_(2)O,HOCl,BeCl_(2),Cl_(2)O` |
| Answer» `H_(2)O` (non-linear), ClOH (non-linear), `BeCl_(2)` (linear), `Cl_(2)O` (non-linear). | |
| 426. |
Which of the following have least dipole moment?A. `H_(2)O`B. `BeF_(2)`C. `NH_(3)`D. `BF_(3).` |
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Answer» Correct Answer - B `(b,c )BeF_(2)` (linear) and `BF_(3)` (symmetrical) have zero dipole moment. |
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| 427. |
Which of following statement is correct ? .A. The bond angle of `NCI_(3)` is greater than that of `NH_(3)`B. The bond angle of `PH_(3)` is greater than that of `PF_(5)`C. `CIO_(3)^(Θ)` and `SO_(3)^(2-)` are isostructuralD. It is not necessary that in Tbp structure the lone pairs always would occupy the equatorial positions . |
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Answer» Correct Answer - C In `NCI_(3),CI` is more `EN` thus bond pairs are pushed near Therefore bond angle of `NCI_(3) lt NH_(3)` (b) In `PF_(5) F` is more `EN` Therefore Bond angle of `PF_(5) lt PH_(3)` (c ) Hybridisation of `CIO_(3)^(Theta) = (1)/(2) (7+0+1) =4 = sp^(3)` Hybridisation of `SO_(3)^(2-) = (1)/(2) (6 +0 +2) = 4 = sp^(3)` Therefore `CIO_(3)^(Theta)` and `SO_(3)^(2-)` are isostructural and in both cases d-orbitals participate in (p pi -d pi) bonding with O-atom In Tbp structure the lp s always occupy the equatorial position becasue angle between equational bonds is `120^(@)` and there is less repulsion between lp-lp thus providing a greater stability to the molecule . |
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| 428. |
Acidic strength order `HCIO gtHBrO gtHIO` . |
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Answer» Correct Answer - T Due to `EN` order `CI gtBr gtI` . |
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| 429. |
Correct B.O. of `O_(2)` is :A. 1B. 2C. `2.5`D. 3 |
| Answer» Correct Answer - B | |
| 430. |
Consider the given figure showing the formation of `H_(2)^(+)` ion depending on intermuclear distance versus potential energy of the system. A. Curve -1 represents the most stable state of the system for `H_(2)^(+)` ionB. Curve -2 represents the most stable state of the system for `H_(2)^(+)` ionC. Curve-1 indicates that the molecular hydrogen ion is formedD. Curve-2 represent the energy level of the antibonding region |
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Answer» Correct Answer - b `BO of H_(2)^(2+) is (1)/(2)` hence curve `-2` shows bonding condition or decrease in potential energy. |
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| 431. |
The molecule that has a linear staructure is :A. `CO_(2)`B. `NO_(2)`C. `SO_(2)`D. `SiO_(2)` |
| Answer» Correct Answer - A | |
| 432. |
Which of the following is a non-linear molecule ?A. `CO_(2)`B. `C_(2)H_(2)`C. HCND. `H_(2)O.` |
| Answer» Correct Answer - D | |
| 433. |
Which one of the following statements about carbon monoxide is correct ?A. It has two lone pairs of electrons on oxygen atomB. Carbon atom in it is sp hybridizedC. In formaing metal carbonyls, oxygen is attached to the metal atomD. It has large value of diple moment |
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Answer» Correct Answer - B CO has the strucuture : `C underset(larr)=O`: which involves sp hybridisation of C-atom . Because of donation of electron by O-atom to C-atom ,it has low polar character and hence low dipole moment ` (0.39 C m/0.117 D)`. |
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| 434. |
Most of the polyatomic molecules except a few such as `CO_(2)` and `CS_(2)` are linear or angular with a bond angle generally somewhat greater than `90^(@)` A bond angle is defined as the angle between the direction of two covalent bonds Since the atoms in molecules are in constant motion with respect to each other they are not expected to have a fixed value of bond angle Repulsion between non-bonded atoms alone does not provide an adequate explanation Hybridisation of bonding orbitals an adequate explanation Hybridisation of bonding orbitals also plays a very important role in detrmining the value of bond angle It has been observed that in hybridisation as the s-character of hybrid orbital increases the bond angle increases Which of the following have highest bond angle ? .A. `H_(2)S`B. `H_(2)Te`C. `H_(2)Se`D. All have same bond angle |
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Answer» Correct Answer - A The bond angle of `H_(2)S` is the highest due to small size and high `EN` of `S` Bond angle of hydrides of group 16 decreases down the group . |
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| 435. |
Most of the polyatomic molecules except a few such as `CO_(2)` and `CS_(2)` are linear or angular with a bond angle generally somewhat greater than `90^(@)` A bond angle is defined as the angle between the direction of two covalent bonds Since the atoms in molecules are in constant motion with respect to each other they are not expected to have a fixed value of bond angle Repulsion between non-bonded atoms alone does not provide an adequate explanation Hybridisation of bonding orbitals an adequate explanation Hybridisation of bonding orbitals also plays a very important role in detrmining the value of bond angle It has been observed that in hybridisation as the s-character of hybrid orbital increases the bond angle increases Which of the following hybridisation may have more than one type of bond angle ? .A. `sp^(2)`B. `sp^(3)`C. `sp^(3)d`D. `sp^(3)d^(2)` |
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Answer» Correct Answer - C The geometry of `sp^(3)d` is Tbp and has two types of bond angles `120^(@)` and `90^(@)` . |
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| 436. |
Which of the following is non-linear ?A. `I_(3)^(-)`B. `XeF_(2)`C. `SO_(2)`D. `CH-= C - C -= CH` |
| Answer» Correct Answer - C | |
| 437. |
When `NH_(3)` is treated with HCl, H-N-H bond angleA. IncreasesB. DecreasesC. Remains sameD. Depends upon temperature |
| Answer» Correct Answer - A | |
| 438. |
Correct order of bond angle for `O-P-X` `P{:(O),(/),( "" ),(X):}` in the given molecules is `underset(I)(POF_(3)) underset(II)(POCl_(3)) underset(III)(POBr_(3)) underset(IV)(POI_(3))` areA. `I gt II gt III gt IV `B. `IV gt III gt II gt I`C. `II gt III gt I gt IV `D. `III gt II gt IV gt I` |
| Answer» Correct Answer - A | |
| 439. |
The strongest bond isA. `Na - CI`B. `Cs - CI`C. both (a) and (b)D. None |
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Answer» Correct Answer - a The smaller the size of cation, the greater will be the lattice energy. Therefore stronger will be the columbic force of attraction between the ions. |
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| 440. |
The hydrogen bond is strongest inA. S-H.. OB. O-H... SC. F- H...FD. O- H. N |
| Answer» Correct Answer - C | |
| 441. |
Explain the structure of `CO_(2)` molecule. |
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Answer» in the single Lewis structure `overset(* *)(":"O)=C=overset(* *)(O":")` for the molecule, carbon atoms is linked to oxygen atoms on both sides by double bonds and all the three atoms involved have complete octets. The standard C=O bond length is 121 pm. However, it has been found to be 115 pm and it is less than the bond lengh which is expected. This mean that C to O bonds only on the basis of reasonance. `CO_(2)` is a hybrid of the following contributing structures `overset(* *)(":"O)=C=overset(-)overset(* *)(O":")harroverset(* *)underset(* *)(":"O)-C-=overset(+)overset(* *)O-=C-overset(-)overset(* *)underset(* *)(O":")` |
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| 442. |
The hydrogen bond is strongest inA. `O-H - - - - S`B. `N- H - - - - -N`C. `F-H - - - - -F`D. Both (1) & (2) |
| Answer» Correct Answer - C | |
| 443. |
In which of the following, hydrogen bond is the strongest ?A. O-H…..FB. O-H…..HC. F-H…..FD. O-H…..O. |
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Answer» Correct Answer - C Hydrogen bonding is miximum as H-F bond is the most polar. |
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| 444. |
In which of the following substances will hydrogen bond be strongest?A. HClB. `H_(2)O`C. HlD. `H_(2)S` |
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Answer» Correct Answer - B Hydrogen bond is the strongest in `H_(2)O` molecules |
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| 445. |
Among the following species, identify the isostructural paris ` NF_(3), NO_(3)^(-) , BF_(3), H_(3)^(+) O , HN_(3)`A. `[NF_(3),NO_(3)^(-)] and [ BF_(3), H_(3)^(+) O]`B. `[NF_(3), NH_(3)] and [NO_(3)^(-), BF_(3)]`C. `[NF_(3),H_(3)^(+)o] and [NO_(3)^(-), BF_(3)]`D. `[NF_(3), H_(3)^(+) O] and [HN_(3), BF_(3)]` |
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Answer» Correct Answer - C `NF_(3) and H_(3) O^(+)` are pyramidal (`sp^(3)` hybridised ) whereas `NO_(3)^(-) and BF_(3)` are triangular planar `(sp^(2)` hybridised ) `NH_(3)` has a bent structure |
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| 446. |
Bond order of 1.5 is shown by:A. `O_2^+`B. `O_2^-`C. `O_2^(2-)`D. `O_2` |
| Answer» Correct Answer - B | |
| 447. |
Which contains strongestn H- hund ?A. O - H….SB. S - H….OC. F - H….FD. F - H….O |
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Answer» Correct Answer - c The strongest hydrogen bond is in hydrogen flauride because the power of hydrogen bohr a electronegativeity of atom has maximumm electrogavity and minimum atomic size |
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| 448. |
In which of the following molecules is hydrogen bridge bond present ?A. WaterB. Inorganic benzeneC. DiboraneD. Methanol |
| Answer» Correct Answer - C | |
| 449. |
Select the molecules which has only one pi bondA. `CH-=CH`B. `CH_(2)=CHCHO`C. `CH_(3)=CH=CH_(2)`D. `CH_(3)C-=C COOH` |
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Answer» Correct Answer - C `CH_(3)CH=CH_(2)` (Propene) has only one Pi-bond. |
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| 450. |
Which of the following species have the same shape?A. `CO_(2)`B. `CCl_(4)`C. `O_(3)`D. `NO_(2)^(-)` |
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Answer» Correct Answer - C::D (c,d) The shape of following species are `CO_(2)` = linear `CCl_(4)` = tetrahedral `O_(3)` = bent `NO_(2)^(-)` = bent |
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