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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.
| 301. |
Among the following VWF are maximum in :-A. HBrB. LiBrC. LiClD. AgBr |
| Answer» Correct Answer - D | |
| 302. |
The correct expected order of decreasing lattice energy is :-A. `CaO gt MgBr_(2) gt CsI`B. `MgBr_(2) gt CaO gt CsI`C. `CsI gt MgBr_(2) gt CaO`D. `CsI gt CaO gt MgBr_(2)` |
| Answer» Correct Answer - A | |
| 303. |
VALENCY OF AN ATOMA. Combining power of an atomB. Atomicity of an elementC. oxidation number of an elementD. Charge on an ion |
| Answer» Correct Answer - A | |
| 304. |
Which of the following order is incorrect :-A. Ionic character= `MCl lt MCl_(2) lt MCl_(3)`B. Polarizibility `= F lt Cl^(-) lt Br^(-) lt I^(-)`C. Polarising power `=Na^(+) lt C^(+2) lt Mg^(+2) lt Al^(+3)`D. Covalent character`=LiF lt LiCl lt LiBr lt LiI` |
| Answer» Correct Answer - A | |
| 305. |
Among the following which property is commonly exhibited by a covalent compoundA. High solubility in waterB. High electrical conductanceC. Low boiling pointD. High melting point |
| Answer» Correct Answer - C | |
| 306. |
Which of the following is not the characteristic of a covalent compound ?A. low melting pointB. No definite geometryC. insoluble in polar solventD. small difference in electronegativily between the combining atoms |
| Answer» Correct Answer - B | |
| 307. |
Hydrogen bonding is not present inA. GlycerineB. WaterC. Hydrogen sulphideD. Hydrogen fluoride |
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Answer» Correct Answer - C Hydrogen bonding is present in molecules which have F, O or N atoms |
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| 308. |
H-bonding is maximum inA. `C_(6)H_(5)OH`B. `C_(6)H_(5)COOH`C. `CH_(3)CH_(2)OH`D. `CH_(3)COCH_(3)` |
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Answer» Correct Answer - B Due to greater resonance stabilization. |
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| 309. |
Water has high heat of vaporisation due to ?A. Covalent bondingB. H-bondingC. Ionic bondingD. None of the above |
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Answer» Correct Answer - B Hydrogen bonding increases heat of vaporisation. |
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| 310. |
HCl is a gas but HF is a low boiling liquid. This is becauseA. H-F bond is strongB. H-F bonding is weakC. Molecules aggregate because of hydrogen bondingD. HF is weak acid |
| Answer» Correct Answer - C | |
| 311. |
Contrary to other hydrogen halides, hydrogen fluoride is liquid becauseA. Size of F atom is smallB. HF is a weak acidC. HF molecules are hydrogen bondedD. Fluorine is highly reactive |
| Answer» Correct Answer - C | |
| 312. |
Which of the following has the highest boiling point?A. `H_2O`B. `HF`C. `NH_3`D. `H_2Te` |
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Answer» Correct Answer - A The correct order of boiling points is `H_2OgtHFgtH_2TegtNH_3` It may seem odd at first that the boiling point of HF is lower than that of water. Fluorine is more electronegative than oxygen, and so we would expect a stronger hydrogen bond in liquid HF than in `H_2O`. But `H_2O` is unique in that each molecule takes part in four intermolecular H bonds, and the `H_2O` molecules are, therefore, held together more strongly. |
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| 313. |
Which among the following substances does not conduct electricity in its aqueous solution state?A. glucoseB. alcoholC. hydrochloric acidD. common salt |
| Answer» Since glucose does not ionise in water, it does not conduct electricity in its aqueous solution sate. | |
| 314. |
The species having pyramidal shape isA. `SO_(3)`B. `BrF_(3)`C. `SiO_(3)^(2-)`D. `OSF_(2)` |
| Answer» Correct Answer - (d) | |
| 315. |
Which of the following substances when dissolved in water will give a solution that does not conduct electricityA. Hydrogen chlorideB. potassium hydroxideC. sodium acetateD. Urea |
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Answer» Correct Answer - D Urea solution does not conduct electricity because it is a covalent compound. |
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| 316. |
The molecule that will have dipole moment is:A. 2,2-DimethylpropaneB. Trans-2-penteneC. Cis-3-HexeneD. 2,2,3,3,-tetramethylbutane |
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Answer» Correct Answer - B::C (a) and (d) are symmetric alkanes, hence these are non-polar, while (b) and (c) are symmetric alkenes hence they possess dipole moment. |
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| 317. |
Which of the following conducts electricity in the fused stateA. `BeCl_(2)`B. `MgCl_(2)`C. `SrCl_(2)`D. `BaCl_2` |
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Answer» Correct Answer - B::C::D Generally `MgCl_2,SrCl_(2),BaCl_(2)` are ionic compounds so they conduct electricity in fused state. |
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| 318. |
`CO_(3)^(2-)` anion has which of the following charactersticsA. Bonds of unequal lengthB. `sp^(2)` hybridization of C atomC. Resonance stabilizationD. Same bond angles |
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Answer» Correct Answer - B::C::D These are the characterstics of `CO_(3)^(2-)` ion. |
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| 319. |
Lewis concept of covalency of an element involved octet rule .Later on it was found that many elements in their compoinds `e.g, BeF_2,BF_3` etc . Have incomplete octet whereas `PCl_5 ,SF_6` etc , have expanded octet . This classical conept also failed in predicting the geometry of molecules .Modern concept of covalence was propsed in terms of valence bond theory proposed by Heitler and London and later on modified by Pauling nad Slater . Hybridisation concept alongwith valence bond theory although successfully explained the geometry of various molecules but failed in many molecules . the geometry of such molecules was explained by VSEPR concept . Finally molecular orbital theory was porosed by Hund -Mulliken to explain many other anomalies . Which of the following statements are true ? (1) `O_2, O_2^(-)` and `O_2^(-)` are paramangetic species (2) Correct bond order is : `O_2^(+) gt O_2^(-) gt O_2` (3) Bond lenght is shortest for ` O_2^(+)` among the species `O_2, O_2^(-) , O_2^(2-) , O_2^(+)` and ` O_2^(2+)` (4) Bond length is maximum for `O_2^(2-)` among the species ` O_2, O_2^(-), O_2^(2-) ,O_2^(+)` and `O_(2)^(2+)` (5) `B_2` has two unpaired electron and thus parmagnetic .A. ` 1, 2, 3, 5`B. ` 1, 3, 4, 5`C. ` 1, 2, 5`D. ` 1, 4, 5` |
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Answer» Correct Answer - D Bond order ` O_2^(+) lt O_2^(-) lt O_2` . |
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| 320. |
Lewis concept of covalency of an element involved octet rule .Later on it was found that many elements in their compoinds `e.g, BeF_2,BF_3` etc . Have incomplete octet whereas `PCl_5 ,SF_6` etc , have expanded octet . This classical conept also failed in predicting the geometry of molecules .Modern concept of covalence was propsed in terms of valence bond theory proposed by Heitler and London and later on modified by Pauling nad Slater . Hybridisation concept alongwith valence bond theory although successfully explained the geometry of various molecules but failed in many molecules . the geometry of such molecules was explained by VSEPR concept . Finally molecular orbital theory was porosed by Hund -Mulliken to explain many other anomalies . Which statements are correct for `CO^(+)` and `N_2^(+)` according to molecular orbital theory ? (1) Both have same configuration (2) Bond order for ` CO_^(+)` and `N_2^(+)` are ` 3.5 ` and ` 2.5` (3 ) Bond order for `CO^(+)` and `N_2^(+)` form `N_2`, the bond length increase (5) During the formation of ` CO^(+)` from ` CO` the bond length decrease .A. ` 2, 4, 5`B. ` 1, 3, 4,5`C. ` 1, 3`D. ` 1, 2, 3` |
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Answer» Correct Answer - A Follow exception in ` CO` ( text ) . |
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| 321. |
Bond formed in crystal by anion and cation isA. ionicB. metallicC. covalentD. dipole |
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Answer» Correct Answer - A Generally cation and anion form ionic bond. |
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| 322. |
The length of H bonds isA. same as that of covalent bondsB. greater than that of covalent bondsC. less than that of covalent bondsD. less, greater, or same as that of covalent bonds depending upon the nature of substance |
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Answer» Correct Answer - B Hydrogen bonds are weaker than covalent bonds. Thus, they also possess higher bond lengths. |
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| 323. |
Which of the following polar solvents has the highest dielectric constant?A. `H_2O`B. `D_2O`C. `CH_3OH`D. `C_2H_5OH` |
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Answer» Correct Answer - A The dielectric constant of `D_2O(80.5)` is slightly less than that of `H_2O(82)`. Others are `CH_3OH(35)` and `C_2H_5OH(27)`. |
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| 324. |
The correct order for bond angles is :A. `NO_2^+ gt NO_2gtNO_2^-`B. `No_2^+ gt NO_2^- gtNO_2`C. `NO_2 gtNO_2^- gtNO_2^+`D. `NO_2^- gtNO_2 gtNO_2^+` |
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Answer» Correct Answer - A Each has `sp^2` -hybridsation having one lone pair on ` N` in `NO_2^+`, one lone paire and one unshared pair of elctron on N in `NO_2` and tow lone pair of electrons in ` NO_2^-`. Thus bond angles are ` NO_2^+ gt NO_2 gt NO_(2)^(-) :: 180^@ gt 132^@ gt 115^@`. |
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| 325. |
Maleic acid is stronger than fumaric acid because :A. fumaric acid shows intermolecular H-bondingB. fumaric acid shows intramolecular H-bondingC. maleic acid is dibasic acidD. maleic acid shows chelation |
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Answer» Correct Answer - B Fumaric acid shows intramolecualr H-bonding ( chelation ) and thus `-COOH` is stabilized. |
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| 326. |
Which of the following ionic solids has the lowest melting point?A. `KCl`B. `NaCl`C. `LiF`D. `LiCl` |
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Answer» Correct Answer - D In spite of high lattice enthalpy, `LiCl(828 kJ mol^(-1))` has low melting point `(610^@C)` due to covalent character. LiF has the highest melting point `(845^@C)` due to maximum `Delta_(Lat tice)H`. Others are `NaCl(788 kJ mol^(-1), 801^@C)` and `KCl(699 kJ mol^(-1), 772^@C)`. |
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| 327. |
Coordination number of hydrogen in a hydrogen bond isA. `8`B. `4`C. `2`D. `1` |
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Answer» Correct Answer - C Hydrogen bond is written as `A-H……..B` or `A-H…….A` A and B represent O, N, or F. `A-H` is one molecule or part of a molecule and B is a part of another molecule. The dotted line represents the hydrogen bond. As we can see, H atom is sandwiched between two highly electronegative atoms. Thus, its largest coordination number is two. |
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| 328. |
The coordination number of ions in ionic solids is decided by theA. magnitude of charge on the ionsB. number of electrons in the ionsC. ionic radii of ionsD. electronic configurations of ions |
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Answer» Correct Answer - C The radius of an ion and of its oppositely charged ion-the number of its nearest neighbors of opposite charge. Where the difference in the size of the ions is greater, the coordination number is smaller. In ZnS, the great difference in size between the `Zn^(2+)` cation and the `S^(2-)` anion leads to the CN of 4. When the anion and cation are nearly of the same size in `CsCl`, the CN is 8. |
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| 329. |
What is the coordination number of an ion in sodium chloride?A. `6`B. `8`C. `4`D. `2` |
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Answer» Correct Answer - A The coordination number of an ion in a given crystalline ionic solid is the number of nearest oppositely charged ions surrounding it. In the `NaCl` structure, each `Na^(+)` ion is surrounded by `6Cl^(-)` ions as its nearest neighbors, and each `Cl^(-)` ion is surrounded by `6Na^(+)` ions. |
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| 330. |
Octrahedral shape is associated withA. `PF_5`B. `SF_4`C. `TeF_6`D. `ClF_3` |
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Answer» Correct Answer - C All the other three involves `sp^3d` hybridisation of the central atom. |
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| 331. |
`CO_(2)` exists in the gaseous state, whereas `SiO_(2)` is a hard solid though both carbon and silicon belong to the same group. Give reasons. |
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Answer» (i) comparison of size of carbon and silicon (ii) effect of size of carbon and silicon on the nature of bond present in `CO_(2)` and `SiO_(2)` (iii) influence of nature of bonds on the structure of the molecules (iv) relation between the structure of the substance and physical state of matter |
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| 332. |
A sigma-bonded molecule `MX_(3)` is T-shaped. The number of non-bonding pairs of electrons is |
| Answer» Correct Answer - (b) | |
| 333. |
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 the correct explanation of the assertionB. if both assertion and reason are true but reason is not the 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 - A Polarity in covalent bond Is developed due to shifting of electrons towards one of the bonded atoms. |
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| 334. |
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 assertionB. if both assertion and reason are true but reason is not the 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 It is true that sigma `(sigma)` bond is stronger than pi `(pi)` bond but the reason that there is free rotation of atoms is false. |
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| 335. |
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 the correct explanation of the assertionB. if both assertion and reason are true but reason is not the 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 - A Solubility in water depends on hydration energy and lattice energy. |
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| 336. |
An ionic solid is poor conductor of electricity becauseA. Ions do not conduct electricityB. Charge on the ions is uniformly distributedC. Ions occupy fixed positions in solidsD. lons have uniform field of influence around it. |
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Answer» Correct Answer - C Because ions have fixed positions and are not free to move |
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| 337. |
Highest viscosity is exhibited byA. GlycerolB. Ethylene glycolC. EthanolD. Water. |
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Answer» Correct Answer - A The extent of H-bonding is maximum in glycerol due to three-OH groups per molecule. |
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| 338. |
In which of the following species the underlined C atom has `sp^3` hybridization?A. `CH_2=ulCH-CH_3`B. `CH_3ulCH_2OH`C. `CH_3ulCOCH_3`D. `CH_3ulCOOH` |
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Answer» Correct Answer - B `C` atom forming 4 sigma bonds (zero `pi` bonds) is `sp^3`-hybridized, `C` atom forming `3` sigma and `1` pi bonds is `sp^2`-hybridized, and `C` atom forming `2` sigma and `2` pi bonds is `sp`-hybridized. `{:(CH=underset(sp^(2))overset(H)overset(|)C-CH_(3),,CH_(2)=underset(H)underset(|)overset(H)overset(|)Coverset(sp^(2))-OH),(CH_(3)-underset(sp^(2))overset(O)overset(||)C-CH_(3),,CH_(3)-underset(sp^(2))overset(O)overset(||)C-O-H):}` |
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| 339. |
The structure represents the molecules more accurately, is calledA. resonance hybridB. canonical structureC. resonating structureD. None of these |
| Answer» Correct Answer - (a) | |
| 340. |
Which of the following has unchanged valency?A. HB. NaC. FeD. Oxygen |
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Answer» Correct Answer - B Na has only valency +1 H has valencies +1,0, -1 Fe has valencies +2, +3 etc. |
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| 341. |
Which of the following is not paramagnetic ?A. NOB. `S^(-2)`C. `O_2^(-1)`D. `N_2^-` |
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Answer» Correct Answer - B `S^(2-)`has all the electrons paired. Hence it is not paramagnetic |
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| 342. |
The geometry of ` H_2 S` and its moment are :A. angular and non-zeroB. angular and zeroC. linear and non-zeroD. linear and zero |
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Answer» Correct Answer - B `S` in `H_2S` shows `sp^3` -hybridisation with angular V-shape due to the presence of two lone pair on `S` atom . Also ` mu ne 0`. |
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| 343. |
Which one of the following formulae does not correctly represent the bonding capacities of the atoms involved ?A. `[H-overset(H)overset(|)underset(H)underset(|)(P)-H]^(+)`B. C. D. |
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Answer» Correct Answer - D In `H-C=overset(O)overset(||)underset(**)(C)-O-H` the asterisked carbon has a valency of 5 and hence this formula is not correct. |
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| 344. |
In an octahedral structure , the pair of d orbitals involved in `d^(2)sp^(2)` hybridization isA. `d_(x^(2)),d_(xz)`B. `d_(xy),d_(yz)`C. `d_(x^(2)-y^(2)),d_(z^(2))`D. `d_(xz),d_(x^(2)-y^(2))` |
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Answer» Correct Answer - C In the formation of `d^(2)sp^(3)` hybrid orbitals two (n-1)d orbitals of e.g., set [i.e, `(n-1)dz^(2)` and (n-1) `dx^(2)-y^(2)` orbitals) one ns and three np[`np_(x),np_(y)` and `np_(x)` ]orbitals combine together and form six `d^(2)sp^(3)` hybrid orbitals. |
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| 345. |
In which of the following molecule in the bond angle is maximum ?A. `sp^(2)`B. spC. `sp^(3)`D. `dsp^(2)` |
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Answer» Correct Answer - B The bond angle is maximum for sp hybridisation because two sp hybridised orbitals lies at angle of `180^(@)` |
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| 346. |
The correct order of the lattice energies of the following ionic compounds isA. `NaCl gt MgBr_2 gt CaO gt Al_2O_3`B. `NaCl gt CaO gt Mg Br_2gt Al_2O_3`C. `Al_2O_3gt MgBr_2 gt CaO gt NaCl`D. `Al_2O_3 gt CaO gt MgBr_2 gt NaCl` |
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Answer» Correct Answer - D Smaller the size of ions and more the charge more is the lattice energy. (More charge density on ions, more lattice energy). |
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| 347. |
Bond energy of covelent O-H bonds in water isA. Greater than bond energy of H-bondsB. Equal to bond energy of H-bondsC. Less than bond energy of H-bondD. None of these |
| Answer» Correct Answer - A | |
| 348. |
Which of the following is non-linear moleculeA. `CO_(3)^(2-)`B. `CO_(2)`C. `CS_(2)`D. `BeCl_2` |
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Answer» Correct Answer - A Except `CO_(3)^(2-)` other choice `CO_(2),CS_2` and `BeCl_(2)` have sp -hybridisation and show the linear structure while `CO_(3)^(2-)` have `sp^(3)` hybridisation and show the non linear |
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| 349. |
Which of the following respresents the given mode of hybridisation ` sp^2 -sp^2 -sp -sp` from left to right ?A. `CH_(2) =CH - C -= CH`B. `CH -= C-C -= CH`C. `CH_2 = CH - C = CH_2`D. `CH_2 = CH - CH = CH_2` |
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Answer» Correct Answer - A `underset(sp^2) (CH_2) =underset(sp^(2)) (CH)-underset(sp)(C ) -=underset(sp)(CH)` |
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| 350. |
H-B- H bond angel in `BH_4^-` is :A. ` 180^@`B. `120^@`C. `109^@`D. `90^@` |
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Answer» Correct Answer - C Due to ` sp^3`-hybridsiation . |
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