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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.
| 801. |
In which of the following molecules the central atom does not use `sp^3` hybrid orbitals in its bonding?A. `NH_2^-`B. `BeF_3^-`C. `SO_2Cl_2`D. `SO_4^(2-)` |
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Answer» Correct Answer - B In `BeF_3^-`,H=`1/2`[2+3+1]=3 i.e., Be is `sp^2` hybridised |
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| 802. |
An `sp^(3)` hybrid orbital possessesA. `1/4` s-characterB. `1/2` s-characterC. `1/3` s-characterD. `2/3` s-character |
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Answer» Correct Answer - A In `sp^3` hybrid orbital one part, out of four orbital is s-orbital, so it have 25% or `1/4` s-character. |
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| 803. |
The compound with `C` uses in the `sp^(3)` hybrid orbitals for bond formation is .A. HCOOHB. `(NH_2)_2CO`C. `(CH_3)_3COH`D. `CH_2=C=O` |
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Answer» Correct Answer - C Only `(CH_3)_3COH` contains `sp^3` hybrid C. |
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| 804. |
The species in which the cantral atom uses `sp^(2)` hybrid orbital in its bonding is:A. `PH_(3)`B. `NH_(3)`C. `CH_(3)^(+)`D. `SbH_(3)` |
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Answer» Correct Answer - c |
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| 805. |
Which of the following does not apply to metallic bond ?A. Overlapping valence orbitalsB. Mobile valence electronsC. Delocalised electronsD. Highly directed bonds |
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Answer» Correct Answer - D Metallic bond have force of attraction on all sides between the mobile electrons and the positive kernels. Metals having free electrons as a mobile electrons. So, the metallic bond does not have directional property. |
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| 806. |
`sp^(3)` hybrid orbitalos have equal `s` and `p` character. |
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Answer» Correct Answer - F |
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| 807. |
Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear?A. `CH_3-C-=C-CH_3`B. `CH_2=CH-CH_2-C-=CH`C. `CH_3-CH_2-CH_2-CH_3`D. `CH_3-CH=CH-CH_3` |
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Answer» Correct Answer - A `H_3overset4C-overset3C-=overset2C-overset1CH_3` is linear because `C_2` and `C_3` are sp hybridised carbon atom. |
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| 808. |
The geometric form of crystals is the result of orderly arrangement ofA. molecules onlyB. ions onlyC. atoms onlyD. molecules, atoms or ions |
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Answer» Correct Answer - D In crystalline substance, there is an orderly arrangement of atoms or lons or molecules |
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| 809. |
Which of the following molecule forms linear polymeric structure due to H-bonding ?A. `NH_3`B. `H_2O`C. `HCl`D. `HF` |
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Answer» Correct Answer - D HF molecules have linear polymeric structure due to hydrogen bonding. `underset("H-bond")undersetuarr(H-F---H-F---H-F---H-F)` |
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| 810. |
The presence of polar bonds in a polyatomic molecule suggests that the molecule has non-zero dipole moment. |
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Answer» Correct Answer - F |
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| 811. |
Which of the following molecule does not have a linear arrangement of atoms ?A. `H_(2)S`B. `C_(2)H_(2)`C. `BeH_(2)`D. `CO_(2)` |
| Answer» Correct Answer - A | |
| 812. |
`SnCl_(2)` is a non-linear molecule. |
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Answer» Correct Answer - T |
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| 813. |
`H_(2)O` molecule is linear |
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Answer» Correct Answer - F |
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| 814. |
Which of the following molecule does not have a linear arrangement of atoms ?A. `H_2S`B. `C_2H_2`C. `BeH_2`D. `CO_2` |
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Answer» Correct Answer - A `H_2S` have `sp^3` hybridisation while remaining all have sp hybridisation , so `H_2S` have bent structure and other have linear geometry. |
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| 815. |
The compound which contains both ionic and covalent bonds isA. `CH_(4)`B. `H_(2)`C. `KCN`D. `KCl` |
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Answer» Correct Answer - c |
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| 816. |
The molecule (s) that will have dipole moment is/are:A. 2,2-dimethyl propaneB. trans -2-penteneC. cis-3-hexeneD. 2,2,3,3-tetrametyl butane |
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Answer» Correct Answer - b,c |
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| 817. |
Among the following, the linear molecule isA. `CO_(2)`B. `NO_(2)`C. `SO_(2)`D. `ClO_(2)` |
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Answer» Correct Answer - a |
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| 818. |
In which of the following is the angle between the two covalent bonds greatestA. `CO_(2)`B. `CH_(4)`C. `NH_(3)`D. `H_(2)O` |
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Answer» Correct Answer - A `CO_(2)` has bond angle `180^(@)` |
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| 819. |
Molten sodium chloride conducts electricity due to the presence ofA. Free electronsB. Free ionsC. Free moleculesD. Atoms of sodium and chlorine |
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Answer» Correct Answer - B Molten sodium chloride conducts electricity duet o the presence of free ions. |
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| 820. |
If molecule `MX_3` has zero dipole moment, the sigma bonding orbitals used by M (atomic number `lt21`) areA. pure `p`B. `sp`-hybridisedC. `sp^(2)`-hybridisedD. `sp^(3)-hybridised |
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Answer» Correct Answer - c |
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| 821. |
If molecule `MX_3` has zero dipole moment, the sigma bonding orbitals used by M (atomic number `lt21`) areA. pure pB. sp hybridC. `sp^(2)` hybridD. `sp^(3)` hybrid |
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Answer» Correct Answer - C In trigonal planar geometry (for `sp^(2)` hybridization), the vector sum of two bond moments is equal and oppsite to the third. |
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| 822. |
Which of the following is an electrovalent linkage ?A. `CH_(3)Cl`B. NaClC. `CH_(4)`D. `Cl_2` |
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Answer» Correct Answer - B Na is highly electropositive while Cl is highly electronegativity so they will form ionic bond. |
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| 823. |
The angle between the covalent bonds is maximum in :A. `CH_4`B. `BF_3`C. `PF_3`D. `NH_3` |
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Answer» Correct Answer - B Among the given species, the highest angle around the central atom is FBF `(120^@)`. |
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| 824. |
Ionic bonds are non-directional while covalent bonds are directional.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason in not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - D Covalent bond between two atoms is formed by pairing of electrons present in the valence shell having opposite spins ( orbital overlap concept). Covalent bonds are directional in nature as hybrid orbitals are involved in bond formation which are directed in space in some preferred directions. (valence bond theory). |
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| 825. |
The octer rule is not valid for the molecule .A. `CO_2`B. `H_2O`C. `O_2`D. `CO` |
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Answer» Correct Answer - D CO molecule does not follow octet rule |
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| 826. |
Two elements whose electronegativities are `1.2` and `3.0` the bond formed between them would beA. ionicB. polar covalentC. co-ordinateD. metallic |
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Answer» Correct Answer - A When electronegativity difference is from 1.7 to 3.0 this bond is called as ionic bond. |
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| 827. |
The number of `sigma-and pi` bonds present in pent-4en-1-yne is :A. 3, 10B. 9,4C. 4,9D. 10, 3 |
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Answer» Correct Answer - D The structure of pent-4-en-1-yne is `H-underset(1)(C)-=underset(2)(C)-underset(H)underset(3|)oversetoverset(H)(|)C-underset(4)oversetoverset(H)(|)(C )=underset(5)oversetoverset(H)(|)(C)-H` `:.` It contains10 `sigma` and `3pi` - bonds. |
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| 828. |
The strength of bonds by 2s -2s, 2p2p and 2p-2s overlap has the orderA. s-s gt p-p gt p-sB. s-s gt p-s gt p-pC. p-p gt p-s gt s-sD. p-p gt s-s gt p-s |
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Answer» Correct Answer - C More is the directional character. greater is the strength of bond |
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| 829. |
The conditions for the combination of atomic orbitals to form molecular orbitals are stated below. Mark the incorrect condition mentioned here.A. The combining atomic orbitals must have nearly same energy.B. The combining atomic orbitals must overlap to maximum extent.C. Combining atomic orbitals must have same symmetry about the molecular axis.D. Pi `(pi)` molecular orbitals are symmetrical around the bond axis. |
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Answer» Correct Answer - D Sigma molecular orbitals are symmetrical around the bond axis while pi molecular orbitals are not symmetrical. |
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| 830. |
Which one has covalent as well as ionic valency?A. NaClB. NaOHC. `H_2O`D. HCl(g). |
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Answer» Correct Answer - B In NaOH, the bond between O and H is covalent while that between `Na^(+) and OH^(-)` is ionic. |
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| 831. |
The compound which contains both ionic and covalent bonds isA. `CH_4`B. `H_2`C. `KCN`D. `KCl` |
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Answer» Correct Answer - C Ionic bond between `K^(+) and CN^(-)` ions and covalent bond between C and N atom |
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| 832. |
Which of the following statements is not true regarding molecular orbital theory?A. The atomic orbitals of comparable energies combine to form molecular orbitals.B. An atomic orbital is monocentric while a molecular orbital is polycentric.C. Bonding molecular orbital has higher energy than antibonding molecular orbital.D. Molecular orbitals like atomic orbitals obey Aufbau principle for filling of electrons. |
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Answer» Correct Answer - C Bonding molecular orbital has lower energy than the antibonding molecular orbital. |
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| 833. |
Which of the following provides explanation for the ionic nature of `AlCl_3. 6H_2O` although we know that `AlCl_3` is covalent?A. ResonanceB. Concept of hydration energyC. Concept of molecular orbitalsD. ionisation energy |
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Answer» Correct Answer - B Ionic nature of `AlCl_3. 6 H_2O` is explained on the basis of hydration energy released when `Al^(3+)` surrounded by `6H_2O` molecules. This energy compensates the high ionisation energy required for the formation of `Al^(3+)` from Al. |
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| 834. |
`BCl_3` molecule is planar while `NCl_3` is pyramidal becauseA. `BCl_3` does not have lone pair on B but NCl hasB. B-Cl bond is more polar than N-Cl bondC. N atom is smaller than BD. N-Cl bond is more covalent than B-Cl bond |
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Answer» Correct Answer - A B in `BCl_3` is `sp^2` hybridised while, N in `NCl^3` is `sp^3` hybridised. |
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| 835. |
Covalent compounds have low melting points becauseA. covalent molecules have definite shapeB. covalent bond is weaker than ionic bondC. covalent bond is less exothermicD. covalent molecules are held by weak van der Waals forces of attraction. |
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Answer» Correct Answer - D Covalent compounds have low melting points because their molecules are held by weak van der Waals forces. |
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| 836. |
Assertion : Octet rule is based upon the chemical inertness of noble gases. Reason : Octet rule can explain the shape and relative stability of the molecule.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason in not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - C Octet rule does not account for the shape of molecules and does not explain the relative stability of the molecules being totally silent about the energy of a molecule. |
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| 837. |
A molecule `XY_2` contains two `sigma`, two `pi` and one lone pair of electron in valence shell of X. The arrangement of lone pair as well as bond pairs isA. square pyramidalB. linearC. trigonal planarD. unpredictable |
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Answer» Correct Answer - C The valence shell of x has three pairs of electrons `2sigma` and one lone pair therefore it has planar triangular geometry. `pi` pair of electrons are not considered for deciding geometry. |
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| 838. |
Assertion : `PF_(5),SF_(6)and H_(2)SO_(4)` are the examples of expanded octet molecules . Reason : Octet rule is not applicable to the second period elements of the periodic table.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason in not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - C In `PF_(5), SF_(6) and H_(2)SO_(4)`, the central atom has more than eight valence electrons hence they exhibit expanded octet. This is possible due to availability of 3d orbitals. Elements in and behond the third period of the periodic table do not follow octet rule thus it applies mainly to the second period elements of the periodic table. |
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| 839. |
Which one of the following exceeds octet rule ?A. `NH_(3)`B. `CH_(4)`C. `CO_(2)`D. NO |
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Answer» Correct Answer - D `underset(*)overset(..)N = underset(..)overset(..)O` For NO, the octet rule is not followed due to the presence of odd electrons on N. |
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| 840. |
`BCl_3` is a planar molecular because in this molecule boron isA. `sp^3` hybridisedB. `sp^2` hybridisedC. sp hybridisedD. un hybridised |
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Answer» Correct Answer - B Because B is `sp^2`-hybridised in `BF_3` |
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| 841. |
Two elements P and Q combine to form a compound. If P has 2 and Q has 6 electrons in their outermosrt shell, what will be formula of the compound formed ?A. PQB. `P_(2)Q`C. `P_(2)Q_(3)`D. `PQ_(2)` |
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Answer» Correct Answer - A Valence electrons in P is 2, Valence electrons in Q is 6 . `P - 2e^(-) to P^(2+)` `Q + 2e^(-) to Q^(2-)` Since both show a valency of 2, the formula for the compound will be PQ. |
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| 842. |
2s and 2p- atomic orbitals combine to give how many molecular orbitals ?A. 2B. 4C. 8D. 6 |
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Answer» Correct Answer - C `2s to (sigma2s) (sigma^(**)2s(2)` `2p to (sigma2p_(z))(sigma^(**)2p_(z))(pi2p_(x))(pi^(**)2p_(x))(pi2p_(y))(pi^(**)2p_(y))(6)` |
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| 843. |
The electronegativities of F, `Cl`, `Br`, and `I` are `4.0, 3.0, 2.8`, and `2.5`, respectively. The hydrogen halide with a high percentage of ionic character isA. `HF`B. `HCl`C. `HBr`D. `HI` |
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Answer» Correct Answer - A Percentage ionic character is directly related to the electronegativity difference. Thus, on account of the highest electronegativity difference, `HF` has the maximum ionic character. The correct order is `HFgtHClgtHBrgtHI` |
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| 844. |
Sodium chloride is an ionic compound whereas hydrogen chloride is Mainly covalent becauseA. Sodium is less reactiveB. Hydrogen is a non-metalC. Hydrogen chloride is a gasD. Electronegativity difference in the case of hydrogen and chlorine is less than 2.1 |
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Answer» Correct Answer - B A compound formed between two non metal atoms is a covalent bond. |
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| 845. |
Assertion : In the formation of water octet molecule, both hydrogen and oxygen atoms attain octet of electrons. Reason : Oxygen atom forms two ionic or electrovalent bonds with two hydrogen atoms.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason in not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - D In the formation of water molecule, oxygen atom forms covalent bond with each hydrogen atom by sharing electrons so as to complete duplet fo hydrogen atom and octet of oxygen atom. |
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| 846. |
In which of the following species the bond is nondirectional ?A. `NCl_(3)`B. `RbCl`C. `BeCl_(2)`D. `BCl_(3)` |
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Answer» Correct Answer - B RbCl is an electrovalent compound hence the bond involves is non- directional. |
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| 847. |
A molecule is square planar with no lone pair. What type of hybridisation is associated with it?A. `sp^3`dB. `sp^3 d^2`C. `dsp^3`D. `dsp^2` |
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Answer» Correct Answer - D `dsp^2` hybridisation e.g., in `[Ni(CN)_4]^(-2)`. |
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| 848. |
Which of the following has `sp^3` hybridisation of central atom ?A. `XeO_3`B. `BCl_3`C. `XeF_4`D. `BBr_3` |
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Answer» Correct Answer - A In `XeO_3`, Xe atom has 3 S.A. and 1 LP and attains pyramidal structure. The hybrid state of Xe is `sp^3` |
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| 849. |
The `AsF_5` molecule is trigonal bipyramidal. The orbitals used by As for hybridisation areA. `d_(x^(2)-y^(2)),d_(z^(2),s),p_(x,)p_(y)`B. `d_(xy),s,p_(x),p_(y),p_(z)`C. `s, p_(x),p_(y),p_(z),d_(z^(2))`D. `d_(x^(2)-y^(2)),s,p_(x),p_(y),p_(z)`. |
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Answer» Correct Answer - C For trigonal bipyramidal, the hybridisation is `sp^(3)` d which involves `s, p_(x), p_(y), p_(z) and d_(z^(2))` orbitals. |
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| 850. |
Iodine in `lF_(7)` is surrounded by 7 pairs of electrons yet it is stable . |
| Answer» `IF_(7)` has lower covalent character i.e., higher ionic character this strengther the I-F interaction these stabilising the molecule . | |