844 + Interview Questions in CHEMICAL-BONDING-AND-MOLECULAR-STRUCTURE IN GENERAL AWARENESS Page 6 InterviewSolution

251.	Lattice energy : Lattice energy is the amount of energy released when one mole of ionic compound is formed from its gaseous ions `underset((g))(Na^(+)) + underset((g))(Cl^(-)) to NaCl(s) + Deltax kJ` Lattice energy also depend on the 3-D arrangement of ion . Which of the following has the highest Lattice energy ?A. MgOB. NaClC. CaOD. KCl
Answer» Correct Answer - A

Discussion

252.	What is the type of hybridisation of carbon atoms marked with star. `(a)overset()CH_(2)=CH-""^()overset(O)overset(\|\|)C-O-H" "(b)CH_(3)-overset()CH_(2)-OH" "(c ) CH_(3)-CH_(2)-overset(O)overset(\|\|)C""^()-H` `(d)overset()CH_(3)-CH=CH-CH_(3)" "(e)CH_(3)-overset()C-=CH`
Answer» `(a) sp^(2),sp^(2)" "(b)sp^(3)" "(c )sp^(2)" "(d)sp^(3)" "(e)sp`

Discussion

253.	In which of the following compounds corban atom undergoes hybridisation of more than one type (i) `CH_(3) CH_(2)CH_(2)CH_(3)` (ii) `CH_(3) - CH = CH - CH_(3)` (iii) `CH_(2) = CH - CH_(2) - CH_(3)` (iv) `H - C = C - H`A. (iii) and (iv)B. (i) and (iv)C. (ii) and (iii)D. Only (ii)
Answer» Correct Answer - c In (ii) `CH_(3) - CH = CH - CH_(3)`, rthe carbon atoms `C_(1)` and `C_(4)` are `sp^(3)` hybridised while `C_(1), C_(2)` and `C_(3)` are `sp^(2)` In (iii) `overset(1)(CH)_(2)=overset(2)(CH)-overset(3)(CH)_(2)-overset(4)(CH)_(3)` , the carbon atom `C_(1)` and `C_(2) are in `sp^(2)` while `C_(3), C_(4)` are in `sp^(3)` state of hybridised while in (iv) both carbon atoms are in `sp` state of hybridization

Discussion

254.	Calculate the formula charge on each atom in a `underset(* )overset( )(":"O)-overset( )(S)=underset( *)(O":")`
Answer» Formula charge on S atom `=6-2-1//2xx6=+1` Formula charge on double bonded O atom `=6-4-1//2xx4=0` Formal charge on single bonded O atom `=6-6-1//2xx2=-1` The molecule in terms of formal charge may be represented as : `overset(-1)overset(* )underset( )(":"O)-overset(+1)overset( )(S)=overset(0)underset( *)(O":")`

Discussion

255.	The hybridisation of `C` atoms in `(C - C)` single-bond of `H - C -= C - CH = CH_(2)` is :A. `sp^(3) - sp^(3)`B. `sp^(2) - sp`C. `sp - sp^(2)`D. `sp^(3) - sp^(2)`
Answer» Correct Answer - b As the first carbon has double bond and second one has triple bond with other two atoms.

Discussion

256.	Explain the following observations : (i) `CO_(2) and SO_(2) ` are not isostructural. (ii) `O_(2) ^(-)` is paramagnetic but `O_(2)^(2-)` is not .
Answer» (i) C in `CO_(2)` is sp hybridized , S in `SO_(2)` in `sp^(2)` hybridized . `CO_(2)` is linear, `SO_(2)` is bent molecule.

Discussion

257.	Assertion (A): Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound. Reason: (R) This is because sodium and chloride ions acquire octet in sodium chloride formation.A. A and R both are correct and R is the correct explanation of AB. A and R both are correct, but R is not the correct explanation of AC. A is true, but R is falseD. A and R both are false.
Answer» Assertion and Reason both are correct and reason is the correct explanation of assertion. `underset(2,8,1)Na + underset(2,8,7)Cl to underset(2,8)NaCl` Here, both `Na^(+)` and `Cl^(-)` have complete octet hence NaCl is stable.

Discussion

258.	The linear struture is assumed by :A. `SnCI_(2)`B. `CS_(2)`C. `NO_(2)^(o+)`D. `NCO^(Theta)`
Answer» Correct Answer - B::C::D `[O=N=O]^(o+).[N-=C -O]^(Theta),S=C=S` All these are linear molecules .

Discussion

259.	Which of the following statement is true ?A. Hf is less polar than HBrB. Absoltely pure water does not contain any ionsC. Chemical boad formation takes place when force of attraction evberone the force of repulsionD. In convence transfer of electrons takes palce
Answer» Correct Answer - c it is a fact

Discussion

260.	Assertion (A): Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound. Reason: (R) This is because sodium and chloride ions acquire octet in sodium chloride formation.A. A and R both are correct, and R is the correct explanation of A.B. A and R both are correct , but R is not correct explanation of A.C. A is true but R is false.D. A and R bot are false.
Answer» Correct Answer - A Reason is the correct explanation for assertionl

Discussion

261.	The linear structure is assumed byA. `SnCl_(2)`B. `NCO^(-)`C. `NO_(2)^(+)`D. `CS_(2)`
Answer» Correct Answer - B::C::D `CNO^(-),NO_(2)^(+) and CS_(2)` all have linear structure while `SnCl_(2)` is angular .

Discussion

262.	Which molecules has zero dipole moment ?A. `H_(2)O`B. `CO_(2)`C. `HF`D. `HBr`
Answer» Correct Answer - b `CO_(4)` is a symmetrical moleculen so its dipole moment is zero .

Discussion

263.	The bond dissociation energy of B - F in` BF_(3)` is `646 KJ mol^(-1)` whereas that of C-F in `CF_(4)` is `515 kJ mol^(-1)` . The correct reason for higher B - F bond dissociation energy as comparad to that of C - F isA. smallar size of B-atom as compared to that of C-atomB. stronger `sigma`-bond between B and F in `BF_(3)`as compared to that between C and F in `CF_(4)`C. significant `ppi-ppi` interaction between B and F in `BF_(3)` whereas there is no possibility of such interaction between C and F in `CF_(4)`D. lower degree of `ppi-ppi` interaction between B and F in `BF_(3)` than between C and F in `CF_(4) `
Answer» Correct Answer - C The empty `2p_(z)` orbitals of B which is not involved in the hybridisation can accept an electron pair from a full `2p_(z)` orbitals of any F-atom , formaing ` pi`-bond . Thus , B-F bond length becomes shorter. Hence, bond is stronger and dissociation energy is higher .

Discussion

264.	Consider the statements : I . Bond length in `N_(2)^(+) is 0.002 Å` greater than in `N_(2)` II. Bond length in `NO^(+) is 0.09 Å` less than in NO III. `O_(2)^(2-)` has shorter bond length than `O_(2)` which of the following statements are ture ?A. I and IIB. II and IIIC. I, II and IIID. I and III
Answer» Correct Answer - A Bond order of `N_(2)` is 3 and that of `N_(2)^(+)` is 2.5 . Greater the bond order , shorter is the bond length Hence order of NO is 2.5 and that of `NO^(+)` is 3 Thus , bond length of `NO^(+)` is shorter . Hence ,II is true Bond order of `O_(2)` is 2 while that ` O_(2)^(2-)` is 1. Thus, bond length of `O_(2)` is shorter . Hence , III is not ture .

Discussion

265.	Why `KHF_(2)` exists but `KHCl_(2)` does not ?
Answer» Due to H-bonding in HF, we have `H-F----H-F----H-F----` This can dissociate to give `HF_(2)^(-)` ion and hence `KHF_(2)` exists but there is no H-bonding in H-Cl. So `Hcl_(2)^(-)` ion does not exist and hence `KHCl_(2)` also does not exist

Discussion

266.	Assertion : Bond order for CO is more than bond order in CO whereas bond order in `N_(2)^(-)` is less than `N_(2)` whereas both are isoelectronic. Reason : Both are same bond order.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.
Answer» Correct Answer - c Both `N_(2)` and `CO` have difference MO configuration but bond order is same which result a charge in `N_(2)^(+) ` and `CO` configuration and thus ,bond order of `N_(2)^(+)` and `CO` are difference.

Discussion

267.	Explain why `N_(2)` has greater bond dissociation energy than `N_(2)^(+) ` whereas `O_(2)^(+)` has greater bond dissociation energy than `O_(2)` .
Answer» `B.O.of N_(2) (3) gt B.O.of N_(2) ^(+)(2.5) but B.O.of O_(2)^(+) (2.5) gt B.O. of O_(2) ` (2) . Greater the bond order , greater is the bond dissociation energy .

Discussion

268.	The bond order of individual carbon-carbon bond in benzene isA. oneB. twoC. between one and twoD. one and two alternately.
Answer» Correct Answer - C

Discussion

269.	The bond order of CO molecule is ………… whereas that of ` CO^(+)` ion is ……………
Answer» Correct Answer - 3, 3.5

Discussion

270.	Out of `sigma _(2s), pi_(2_(p_(x))), pi_(2_(p_(z)))^(**)` the gerde molecular orbital (s) is (are) …………. Whereas ungerde molecular orbital (s) is (are) …………
Answer» `sigma _(2_(s)),pi_(2_(p_(x)))^()` are gerade whereas ` pi_(2_(p_(x))) and pi_(2_(p_(z)))^()` are ungerade

Discussion

271.	Given reason for the following : `H_(2)^(+) and H_(2)^(-)` ions have the same bond order but `H_(2)^(+)` ions are more stable than H_(2)^(-)` .
Answer» `H_(2)^(-) ` has one electron in the antibonding `sigma_(1s)^(**)` molecular orbitals due to which there is some destabilizing effect and hence is less stable than ` H_(2)^(+)` ion (which has no electron in the entibonding orbital).

Discussion

272.	When we move from HF to HCl , the boiling point sharply but on moving further to HBr and HI the boiling point increases . Why ? Or Out of HF, HCl , HBr and HI which has boiling point and why ?
Answer» In H-F , there is H-boiling point is high . There is no H-bonding in HCl . So the boiling point is less . On moving further to HBr and HI, the size of the molecule increases and so the van der Waals forces increase and so does the boiling point . Hence , HCl has the lowest boiling point.

Discussion

273.	Out of `HF, HCl , BHr and HI` , the lowest boiling point is possessed by ………. and highest melting point is possessed by ………
Answer» Correct Answer - HCl, HI

Discussion

274.	In which conversion , bond length decreases ?A. `N_(2) to N_(2)^(+)`B. `N_(2) to N_(2)^(-)`C. `CO to CO^(+)`D. `O_(2) to O_(2)^(-)`
Answer» Correct Answer - C

Discussion

275.	Which of the following combination of orbitals will form a nonbonding molecular orbital ?A. B. C. D.
Answer» Correct Answer - B

Discussion

276.	Which of the forces are considered as shortest ranged ?A. Ionic bondB. Ion-dipole interactionC. Covalent bondD. London forces
Answer» Correct Answer - C

Discussion

277.	Assertion . `H_(2) O` is the only hybride of group -16 which is liquid ordinary tempratyre . Reason . In ice , oxygen atom is surrounded by two covalent bonds and two hydrogen bonds .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.
Answer» Correct Answer - b Correct explanation . `H_(2)O` is a liquid due to extensive hydrogen bonding and hence has high boiling point.

Discussion

278.	Which of the following species has the shortest bond length ? `NO, NO^(+), NO^(2+),NO^(-)`
Answer» The electronic configurations and the bond orders of these species are as follows : (NO has 7 + 8 = 15 electrons) `NO: KK sigma_(2s) ^(2)sigma_(2s) ^(2)sigma_(2p_(z)) ^(2)pi_(2p_(x))^(2) pi_(2p_(x))^(1) " "` Bond order `= (1)/(2) (8-3) = 2.5 ` `NO^(2+)` : One electron is removed from `pi_(2p_(x)) ^(**)` of NO, Bond order =` (1)/(2) (8-4) = 2 ` Thus , ` NO^(+)` has the highest bond order and , therefore, the shortest bond length .

Discussion

279.	Assertion : `CaF_(2)` is solution in water but `CaI_(2)` not. Reason : `CaF_(2)` is soluble in water but `CaI_(2)`.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.
Answer» Correct Answer - d `CaF_(2)` is insoluble in water but more ionic having high lattice energy due to small of `F^(-)` .

Discussion

280.	Why glucose, fructose, sucrose etc. are soluble in water through they are covalent compounds ?
Answer» these compounds contain polar -OH group which can from H-bonds with water .

Discussion

281.	Explain whether `H^(+)` ions will have greater mobility in ice or liquid water .
Answer» Mobility of `H^(+)` ions in liquid water is ledd than that in ice . that is because of the following two reasons. (i) Density of liquid water `(1gL^(-1))` is greater than that of ice `(0.92 g mL^(-1))` (ii) In liquid water `H^(+)` ions get hydrated and thus become heavier as compared to ice.

Discussion

282.	Why ` NaCl ` gives s a white precipitate with ` AgNO_(3)` solution but ` CCl_(4)` does not ?
Answer» NaCl is an ionic compound and hence gives `1 Cl^(-)` ions in the solution which combine with `Ag^(+)` ions gives by ` AgNO_(3)` to form a white precipitete of AgCl but ` Ccl_(4)` is a covalent compound and does not give `Cl^(-)` ions .

Discussion

283.	Is `CaF_(2)` linear or bent or neither of the two ? Justify .
Answer» `CaF_(2)` is neither linear nor-bent molecular because it is ionic compound and ionic bond is non-directional.

Discussion

284.	Which of the following statement is incorrect ? .A. `NH_(3)` is more basic than `PH_(3)`B. `NH_(3)` has a higher boiling point than that of `HF` .C. `N_(2)` is less reactive than `P_(4)`D. The dipole momnet of `NH_(3)` is less than that of `SO_(2)` .
Answer» Correct Answer - B Due to high `EN` of `F` than `N-H`-bonding is stronger in `HF` than `NH_(3)` thus b.pt of `HF gt NH_(3)` .

Discussion

285.	If one assume linear structure instead of bent structure for water then which on of the following properties cannot be explained ? .A. The formation of intermolecular hybrogen bond in waterB. The high boiling point of water .C. Solubility of polar compounds in waterD. Ability of water to form coordinate covalent bond .
Answer» Correct Answer - C If the structure of water is linear, then `mu = 0` hence it will be noo - polar and thus the solubility of polar compound in water cannot be oxplanined .

Discussion

286.	The dipole moment of KCl is `3.336xx10^(-29)` coulomb metre which indicates that is a highly polarized molecule. The interatomic distance between `k^(+) and Cl^(-)` in this molecule is ` 2.6XX10^(10)`m . Calculate the dipole moment of KCl molecule, if there were opposite charges of one fundamental unit located at each nucleus the parcentage ionic character of KCl.
Answer» If there were opposite charges of one fundamental unit , i.e., `q = 1 . 602 xx10^(-19)` coulombs, then `mu = q xxd =(1.602 xx1-^(-19)` coulombs )`xx(2.6 xx10^(-10)m)` `= 4.1652 xx10^(-29)` coulomb metre `mu_("observed")= 3.336xx10^(-29)` coulomb metre `therefore %` ionic character = `(3.336xx10^(-29))/(4.1652 xx10^(-29))xx100 = 80.09%`

Discussion

287.	The nodal plane in the `pi`-bond of ethene is located in:A. The molecular planeB. A plane parallel to the molecular planeC. A plane perpendicular to molecular plane which bisects th `(C -C)` sigma-bond at a right angle .D. A plane perpendicular to the molecular plane which contains the `(C -C)` sigma-bond .
Answer» Correct Answer - A The molecular plane does not have any pi electron density .

Discussion

288.	The nodal plane in the `pi`-bond of ethene is located inA. the molecular planeB. a plane parallel to the molecular planeC. a plane perpendicular to the molecular plane which bisects the carbon-carbon `sigma`-bond at right angle.D. a plane perpendicular to the molecular plane which contains the carbon-carbon `sigma `-bond
Answer» Correct Answer - A The molecular plane does not have any have `pi` electron density.

Discussion

289.	The nodal plane is the pi -bond of ethene is located in :A. the molencular planeB. a plane parallel to the molecular planeC. a plane parpondicular to the molecular plane which bisects the carbon `sigma`-bondat right angleD. a plane parpondicular to the molecular plane which contains the carbon `sigma`-bond
Answer» Correct Answer - a `pi`- electron charge lines above and below molecular plane.

Discussion

290.	Which statement is/are correct(more than one correct) ? (a) In aqueous solution `A1` gives hydrated ions `[A1(H_(2)O)_(6)]^(3+)` (b) Most of aluminium compounds are covalent because formation of `A1^(3+)` requires much more energy `(=5138 kJ mo1^(-1))` which is not available ordinarily (c ) In aqueous solution `A1` forms hydrated ions becuse og high (negative) heat of hydration of `A1^(3+)` compensates the high `IE_(3)` of `A1` (d) Magnitude of hydration energy of `A1^(3+)lt IE_(3)` of `A1` .
Answer» Correct Answer - a,b,c a,b and c are correct statements .

Discussion

291.	Which of the following statement is correct for `CO` ?A. A double bond between `C` and `O` atomsB. `1sigma,1pi` and 1 coordinate bond between `C` and `O` atomsC. One lone pair of electrons on each atomD. `1sigma,2pi` bonds between `C` and `O` atoms
Answer» Correct Answer - B `:Cunderset(larr)(=)underset(..)O:` (1sigma, 1pi,1-coordinate bond) .

Discussion

292.	Write the Lewis dot structure of `CO` molecule .
Answer» Step I. Total number of valence electrons may be calculated as follows : For C atom (4), for O atom (6), total =4+6=10 Step II. The skeletal structure for CO molecule may be written as : C O Step III. Place on electron pair on either side of the two atoms i.e., C and D and O. Adjust the remaining three paires between these atoms :C:::O:

Discussion

293.	Assertion : `AI^(3+)` forms more ionic compound in comparison to `Ga^(3+)` with identical anion. Reason :`r_(AI)^(3+)` and ` z_(eff)` of ` Ga^(3+)` is more than that of `AI^(3+)`.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.
Answer» Correct Answer - a Due to poor Shielding by d-electron in `Ga^(3+)`, its `Z_(eff)` is more .So is polarising power is more and hence it forms compound with covalent character

Discussion

294.	The bond order in `NO` is 2.5 while that in `NO^(o+)` is 3 Which of the following statement is true for these two species ? .A. Bond length in `NO gt "in" NO^(o+)`B. Bond length in `NO^(o+) = "in" NO`C. Bond length in `NO^(o+) = "in" NO`D. Bond length in `NO^(o+) gt "in" NO`
Answer» Correct Answer - A `NO` bond order `=2.5` `NO^(o+)` bond order `=3` Bond order `prop (1)/("Bond length")` Hence bond length of `NO gt NO^(o+)` .

Discussion

295.	The first element of groups `13-16` differ rest of the elements This is due to .A. Small size and high electronegativityB. Inability to expand the octetC. Ability to form strong` ppi` `ppi` multiple bondsD. Due to greater abundance
Answer» Correct Answer - A::B::C

Discussion

296.	Select the correct satements .A. The heat of hydrogen of the dipositive earth metal ions increases with an increase in their ionic sizeB. Hydration of alkali metal ions is less than that of group 2C. Alkaline earth metal ions because of their much larger charge to size ratio exert a much stronger electrostaic attaction on the oxygen of water molecule surrounding them .D. Melting point of sodium halides is as follows `NaF gt NaCI gt NaBr gt Nal` .
Answer» Correct Answer - B::C::D

Discussion

297.	Which of the following overlap is correct?A. B. C. D. None of the above.
Answer» Correct Answer - C

Discussion

298.	For a homonuclear diatomic molecule the energy of `sigma_(2s)` orbital isA. gt `sigma_(2s)^` orbitalB. lt `sigma_(2s)^` orbitalC. gt `sigma_(1s)^**` orbitalD. Both (B) and (C) are correct.
Answer» Correct Answer - D

Discussion

299.	The energy of `sigma_(2s)`, is greater than that of `sigma_(1s)^` orbital becauseA. `sigam 2s` is bigger than `sigma^() 1s MO`B. `sigma 2s` is bonding whereas `sigma^()1s` is an `ABMO`C. `sigma 2s` orbital has a greater value of than `sigma^() 1s MO`D. `sigma 2s` orbital is formed only after `sigma^(**)1s` .
Answer» Correct Answer - C

Discussion

300.	in compound `X` all the bond angles around central atom are `109^(@)28^(@)` one of the following will be `X` ? .A. ChloromethaneB. Carbon tetrachlorideC. lodoformD. Chloroform
Answer» Correct Answer - B The `C CI_(4)` is `sp^(3)` hybridised with four bond pairs and no lone pair s and no lone pairs Thus the bond angle is `109^(@) 28` .

Discussion

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What is the type of hybridisation of carbon atoms marked with star. `(a)overset()CH_(2)=CH-""^()overset(O)overset(||)C-O-H" "(b)CH_(3)-overset()CH_(2)-OH" "(c ) CH_(3)-CH_(2)-overset(O)overset(||)C""^()-H` `(d)overset()CH_(3)-CH=CH-CH_(3)" "(e)CH_(3)-overset()C-=CH`

In which of the following compounds corban atom undergoes hybridisation of more than one type (i) `CH_(3) CH_(2)CH_(2)CH_(3)` (ii) `CH_(3) - CH = CH - CH_(3)` (iii) `CH_(2) = CH - CH_(2) - CH_(3)` (iv) `H - C = C - H`A. (iii) and (iv)B. (i) and (iv)C. (ii) and (iii)D. Only (ii)

Calculate the formula charge on each atom in a `underset(* )overset( )(":"O)-overset( )(S)=underset( *)(O":")`

The hybridisation of `C` atoms in `(C - C)` single-bond of `H - C -= C - CH = CH_(2)` is :A. `sp^(3) - sp^(3)`B. `sp^(2) - sp`C. `sp - sp^(2)`D. `sp^(3) - sp^(2)`

Explain the following observations : (i) `CO_(2) and SO_(2) ` are not isostructural. (ii) `O_(2) ^(-)` is paramagnetic but `O_(2)^(2-)` is not .

The linear struture is assumed by :A. `SnCI_(2)`B. `CS_(2)`C. `NO_(2)^(o+)`D. `NCO^(Theta)`

Which of the following statement is true ?A. Hf is less polar than HBrB. Absoltely pure water does not contain any ionsC. Chemical boad formation takes place when force of attraction evberone the force of repulsionD. In convence transfer of electrons takes palce

The linear structure is assumed byA. `SnCl_(2)`B. `NCO^(-)`C. `NO_(2)^(+)`D. `CS_(2)`

Which molecules has zero dipole moment ?A. `H_(2)O`B. `CO_(2)`C. `HF`D. `HBr`

Consider the statements : I . Bond length in `N_(2)^(+) is 0.002 Å` greater than in `N_(2)` II. Bond length in `NO^(+) is 0.09 Å` less than in NO III. `O_(2)^(2-)` has shorter bond length than `O_(2)` which of the following statements are ture ?A. I and IIB. II and IIIC. I, II and IIID. I and III

Why `KHF_(2)` exists but `KHCl_(2)` does not ?

Explain why `N_(2)` has greater bond dissociation energy than `N_(2)^(+) ` whereas `O_(2)^(+)` has greater bond dissociation energy than `O_(2)` .

The bond order of individual carbon-carbon bond in benzene isA. oneB. twoC. between one and twoD. one and two alternately.

The bond order of CO molecule is ………… whereas that of ` CO^(+)` ion is ……………

Out of `sigma _(2s), pi_(2_(p_(x))), pi_(2_(p_(z)))^(**)` the gerde molecular orbital (s) is (are) …………. Whereas ungerde molecular orbital (s) is (are) …………

Given reason for the following : `H_(2)^(+) and H_(2)^(-)` ions have the same bond order but `H_(2)^(+)` ions are more stable than H_(2)^(-)` .

When we move from HF to HCl , the boiling point sharply but on moving further to HBr and HI the boiling point increases . Why ? Or Out of HF, HCl , HBr and HI which has boiling point and why ?

Out of `HF, HCl , BHr and HI` , the lowest boiling point is possessed by ………. and highest melting point is possessed by ………

In which conversion , bond length decreases ?A. `N_(2) to N_(2)^(+)`B. `N_(2) to N_(2)^(-)`C. `CO to CO^(+)`D. `O_(2) to O_(2)^(-)`

Which of the following combination of orbitals will form a nonbonding molecular orbital ?A. B. C. D.

Which of the forces are considered as shortest ranged ?A. Ionic bondB. Ion-dipole interactionC. Covalent bondD. London forces

Which of the following species has the shortest bond length ? `NO, NO^(+), NO^(2+),NO^(-)`

Why glucose, fructose, sucrose etc. are soluble in water through they are covalent compounds ?

Explain whether `H^(+)` ions will have greater mobility in ice or liquid water .

Why ` NaCl ` gives s a white precipitate with ` AgNO_(3)` solution but ` CCl_(4)` does not ?

Is `CaF_(2)` linear or bent or neither of the two ? Justify .

Which of the following statement is incorrect ? .A. `NH_(3)` is more basic than `PH_(3)`B. `NH_(3)` has a higher boiling point than that of `HF` .C. `N_(2)` is less reactive than `P_(4)`D. The dipole momnet of `NH_(3)` is less than that of `SO_(2)` .

Which of the following statement is correct for `CO` ?A. A double bond between `C` and `O` atomsB. `1sigma,1pi` and 1 coordinate bond between `C` and `O` atomsC. One lone pair of electrons on each atomD. `1sigma,2pi` bonds between `C` and `O` atoms

Write the Lewis dot structure of `CO` molecule .

The bond order in `NO` is 2.5 while that in `NO^(o+)` is 3 Which of the following statement is true for these two species ? .A. Bond length in `NO gt "in" NO^(o+)`B. Bond length in `NO^(o+) = "in" NO`C. Bond length in `NO^(o+) = "in" NO`D. Bond length in `NO^(o+) gt "in" NO`

The first element of groups `13-16` differ rest of the elements This is due to .A. Small size and high electronegativityB. Inability to expand the octetC. Ability to form strong` ppi` `ppi` multiple bondsD. Due to greater abundance

Which of the following overlap is correct?A. B. C. D. None of the above.

For a homonuclear diatomic molecule the energy of `sigma_(2s)` orbital isA. gt `sigma_(2s)^` orbitalB. lt `sigma_(2s)^` orbitalC. gt `sigma_(1s)^**` orbitalD. Both (B) and (C) are correct.

in compound `X` all the bond angles around central atom are `109^(@)28^(@)` one of the following will be `X` ? .A. ChloromethaneB. Carbon tetrachlorideC. lodoformD. Chloroform

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What is the type of hybridisation of carbon atoms marked with star. `(a)overset(**)CH_(2)=CH-""^(**)overset(O)overset(||)C-O-H" "(b)CH_(3)-overset(**)CH_(2)-OH" "(c ) CH_(3)-CH_(2)-overset(O)overset(||)C""^(**)-H` `(d)overset(**)CH_(3)-CH=CH-CH_(3)" "(e)CH_(3)-overset(**)C-=CH`

In which of the following compounds corban atom undergoes hybridisation of more than one type (i) `CH_(3) CH_(2)CH_(2)CH_(3)` (ii) `CH_(3) - CH = CH - CH_(3)` (iii) `CH_(2) = CH - CH_(2) - CH_(3)` (iv) `H - C = C - H`A. (iii) and (iv)B. (i) and (iv)C. (ii) and (iii)D. Only (ii)

Calculate the formula charge on each atom in a `underset(* *)overset(* *)(":"O)-overset(* *)(S)=underset(* *)(O":")`

The hybridisation of `C` atoms in `(C - C)` single-bond of `H - C -= C - CH = CH_(2)` is :A. `sp^(3) - sp^(3)`B. `sp^(2) - sp`C. `sp - sp^(2)`D. `sp^(3) - sp^(2)`

Explain the following observations : (i) `CO_(2) and SO_(2) ` are not isostructural. (ii) `O_(2) ^(-)` is paramagnetic but `O_(2)^(2-)` is not .

The linear struture is assumed by :A. `SnCI_(2)`B. `CS_(2)`C. `NO_(2)^(o+)`D. `NCO^(Theta)`

Which of the following statement is true ?A. Hf is less polar than HBrB. Absoltely pure water does not contain any ionsC. Chemical boad formation takes place when force of attraction evberone the force of repulsionD. In convence transfer of electrons takes palce

The linear structure is assumed byA. `SnCl_(2)`B. `NCO^(-)`C. `NO_(2)^(+)`D. `CS_(2)`

Which molecules has zero dipole moment ?A. `H_(2)O`B. `CO_(2)`C. `HF`D. `HBr`

Consider the statements : I . Bond length in `N_(2)^(+) is 0.002 Å` greater than in `N_(2)` II. Bond length in `NO^(+) is 0.09 Å` less than in NO III. `O_(2)^(2-)` has shorter bond length than `O_(2)` which of the following statements are ture ?A. I and IIB. II and IIIC. I, II and IIID. I and III

Why `KHF_(2)` exists but `KHCl_(2)` does not ?

Explain why `N_(2)` has greater bond dissociation energy than `N_(2)^(+) ` whereas `O_(2)^(+)` has greater bond dissociation energy than `O_(2)` .

The bond order of individual carbon-carbon bond in benzene isA. oneB. twoC. between one and twoD. one and two alternately.

The bond order of CO molecule is ………… whereas that of ` CO^(+)` ion is ……………

Out of `sigma _(2s), pi_(2_(p_(x))), pi_(2_(p_(z)))^(**)` the gerde molecular orbital (s) is (are) …………. Whereas ungerde molecular orbital (s) is (are) …………

Given reason for the following : `H_(2)^(+) and H_(2)^(-)` ions have the same bond order but `H_(2)^(+)` ions are more stable than H_(2)^(-)` .

When we move from HF to HCl , the boiling point sharply but on moving further to HBr and HI the boiling point increases . Why ? Or Out of HF, HCl , HBr and HI which has boiling point and why ?

Out of `HF, HCl , BHr and HI` , the lowest boiling point is possessed by ………. and highest melting point is possessed by ………

In which conversion , bond length decreases ?A. `N_(2) to N_(2)^(+)`B. `N_(2) to N_(2)^(-)`C. `CO to CO^(+)`D. `O_(2) to O_(2)^(-)`

Which of the following combination of orbitals will form a nonbonding molecular orbital ?A. B. C. D.

Which of the forces are considered as shortest ranged ?A. Ionic bondB. Ion-dipole interactionC. Covalent bondD. London forces

Which of the following species has the shortest bond length ? `NO, NO^(+), NO^(2+),NO^(-)`

Why glucose, fructose, sucrose etc. are soluble in water through they are covalent compounds ?

Explain whether `H^(+)` ions will have greater mobility in ice or liquid water .

Why ` NaCl ` gives s a white precipitate with ` AgNO_(3)` solution but ` CCl_(4)` does not ?

Is `CaF_(2)` linear or bent or neither of the two ? Justify .

Which of the following statement is incorrect ? .A. `NH_(3)` is more basic than `PH_(3)`B. `NH_(3)` has a higher boiling point than that of `HF` .C. `N_(2)` is less reactive than `P_(4)`D. The dipole momnet of `NH_(3)` is less than that of `SO_(2)` .

Which of the following statement is correct for `CO` ?A. A double bond between `C` and `O` atomsB. `1sigma,1pi` and 1 coordinate bond between `C` and `O` atomsC. One lone pair of electrons on each atomD. `1sigma,2pi` bonds between `C` and `O` atoms

Write the Lewis dot structure of `CO` molecule .

The bond order in `NO` is 2.5 while that in `NO^(o+)` is 3 Which of the following statement is true for these two species ? .A. Bond length in `NO gt "in" NO^(o+)`B. Bond length in `NO^(o+) = "in" NO`C. Bond length in `NO^(o+) = "in" NO`D. Bond length in `NO^(o+) gt "in" NO`

The first element of groups `13-16` differ rest of the elements This is due to .A. Small size and high electronegativityB. Inability to expand the octetC. Ability to form strong` ppi` `ppi` multiple bondsD. Due to greater abundance

Which of the following overlap is correct?A. B. C. D. None of the above.

For a homonuclear diatomic molecule the energy of `sigma_(2s)` orbital isA. gt `sigma_(2s)^**` orbitalB. lt `sigma_(2s)^**` orbitalC. gt `sigma_(1s)^**` orbitalD. Both (B) and (C) are correct.

in compound `X` all the bond angles around central atom are `109^(@)28^(@)` one of the following will be `X` ? .A. ChloromethaneB. Carbon tetrachlorideC. lodoformD. Chloroform

What is the type of hybridisation of carbon atoms marked with star. `(a)overset()CH_(2)=CH-""^()overset(O)overset(||)C-O-H" "(b)CH_(3)-overset()CH_(2)-OH" "(c ) CH_(3)-CH_(2)-overset(O)overset(||)C""^()-H` `(d)overset()CH_(3)-CH=CH-CH_(3)" "(e)CH_(3)-overset()C-=CH`

Calculate the formula charge on each atom in a `underset(* )overset( )(":"O)-overset( )(S)=underset( *)(O":")`

For a homonuclear diatomic molecule the energy of `sigma_(2s)` orbital isA. gt `sigma_(2s)^` orbitalB. lt `sigma_(2s)^` orbitalC. gt `sigma_(1s)^**` orbitalD. Both (B) and (C) are correct.