94420 + Interview Questions in Chemistry in Class 12

1.	The bond order of Cl-O in ClO_(4)^(-) is (x)/( y ) then x-y=?
Answer» SOLUTION : `:. (X)/( y ) = (7 )/( 4) , x - y = 7-4 = 3`

Discussion

2.	The bond order of C_2^+ is :
Answer» 1 2 3/2 1/2 Answer :C

Discussion

3.	The bond strength is maximum in :
Answer» `He_2^(+)` `H_2^(+)` `He_2` `H_2` ANSWER :D

Discussion

4.	The bond order in peroxide ion is :
Answer» LARGER than in `O_(2)` molecule SMALLER than in superoxide ION equal to that in `N_(2)` molecule greater than in `F_(2)` molecule. Answer :B

Discussion

5.	The bond order in O_(2)^(+) is
Answer» 2 2.5 1.5 3 Solution :`B.O. =(N_(b)-N_a)/2=(8-3)/2=5/2 =2.5`

Discussion

6.	The bond order in NO is 2.5 while that in NO^(+) is 3. Which of the following statements is true for these two species ?
Answer» BOND length in `NO^(+)` is equal to that in NO. Bond length in NO is GREATER than in `NO^(+)`. Bond length in `NO^(+)` is greater than inNO. Bond length is UNPREDICTABLE. ANSWER :B

Discussion

7.	The bond order in O_(2)^(+) is same as in
Answer» 1. `N_(2)^(+)` 2. `CN^(-)` 3. `NO^(+)` 4. CO Answer :A

Discussion

8.	The bond order in O_2^+ IS equal to bond order in:
Answer» `N_2^+` `CN^-` CO `NO^+` ANSWER :A

Discussion

9.	The bond order in N_(2)^(+), O_(2) and F_(2) follows the order :
Answer» 1. `F_(2)lt N_(2)^(+)lt O_(2)` 2. `N_(2)^(+)lt O_(2)lt F_(2)` 3. `O_(2)lt F_(2)lt N_(2)^(+)` 4. `F_(2)lt O_(2)lt N_(2)^(+)` ANSWER :D

Discussion

10.	The bond order in NO^(+) is :
Answer» same as in `O_(2)^(+)` and `N_(2)^(+)` same as in `CO^(+)` same as in `N_(2)` and `CN^(-)` same as in `N_(2)^(+)` and CN. ANSWER :C

Discussion

11.	The bond order between C and C in acetylene molecule is
Answer» 1 2 3 4 Answer :C

Discussion

12.	The bond lengths in the species O_(2), O_(2)^(+) and O_(2)^(-) are in the order
Answer» `O_(2)^(+)gtO_(2)gtO_(2)^(-)` `O_(2)^(+)gtO_(2)^(-)gtO_(2)` `O_(2)gtO_(2)^(+)gtO_(2)^(-)` `O_(2)^(-)gtO_(2)gtO_(2)^(+)` SOLUTION :B.O. in `O_(2)^(+)=(10-5)//2=2.5` B.O. in `O_(2)=(10-6)//2=2.0` B.O in `O_(2)^(-)=(10-7)//2=1.5`

Discussion

13.	The bond lengths in O_(2), O_(2)^(+) and O_(2)^(-) species follow the order :
Answer» 1. `O_(2)^(-)LT O_(2)lt O_(2)^(+)` 2. `O_(2)^(-)lt O_(2)^(+)lt O_(2)` 3. `O_(2)^(+)lt O_(2)lt O_(2)^(-)` 4. `O_(2)lt O_(2)^(+)lt O_(2)^(-)` ANSWER :C

Discussion

14.	The bond length of the S-O bond is maximum in which of the following compounds?
Answer» `SOCl_(2)` `SOBr_(2)` `SOF_(2)` All have same length Solution : ACCORDING to Bent's Rule.

Discussion

15.	The bond length is CO is 1.128Å what will be the bond length of CO in Fe(CO)_(5)?
Answer» 1.158Å 1.128Å 1.178Å 1.118Å Answer :A

Discussion

16.	The bond length in LiF will be
Answer» less than that of NAF equal to that of KF more than that of KF equal to that of NaF. SOLUTION :Due to smaller size of LI than NA or K, LiF has smaller bond length than NaF and KF.

Discussion

17.	The bond length in CO is 1.128 Å. What will be the bond length of CO in Fe(CO)_(5) ?
Answer» `1.158 Å` `1.128 Å` `1.72 Å` `1.118 Å` ANSWER :A

Discussion

18.	The bond length between sp^3 hybridised carbon atom and other carbon atom is minimum in
Answer» Propane Butane Propene Propyne Answer :D

Discussion

19.	The bond length in CO is 1.128 Å. What will be the bond length of CO in Fe(CO)_(5)?
Answer» 1.158Å 1.128Å 1.078Å 1.118Å Solution :C-O bond length is slightly HIGHER then in `Fe(CO)_(5)`due to PRESENT of synergic BONDING.

Discussion

20.	The bond length between sphybrid carbon and other carbon is minimum in:
Answer» propane butane propene propyne Answer :D

Discussion

21.	The bond formed by sidewise overlapping of atomic orbitals is:
Answer» SIGMA BOND PI bond coordinate bond IONIC bond Answer :B

Discussion

22.	The bond in protein structure, that are not broken in denaturation is
Answer» HYDROGEN bond ionic bond peptide bond sulphide bond Answer :C

Discussion

23.	The bond having the highest bond energy is :
Answer» `C=C` `C=S` `C=O` `P=N` SOLUTION :More effective AXIAL and sideways overlapping between atomic orbitals of CARBON and those of oxygen atom is hgiher DUE to smaller SIZE of oxygen atom. Oxygen is more electronegative than oxygen atom, due to these factors CO has highest bond energy.

Discussion

24.	The bond in a molecule of HCl is formed due to the overlapping of:
Answer» s-and p-orbitals s-and sp-orbitals p-and p-orbitals None of these Answer :A

Discussion

25.	The bond enerhies of F_2, Cl_2, Br_2 and I_2 are 155.4, 243.6, 193.2 and 151.2 kJ mol^-1 respectively.The strongest bond is:
Answer» F-F Cl-Cl Br-Br I-I Answer :B

Discussion

26.	The bond energy of ann O-H bond is 109 kcal/mol. When 1 mole of water is formed, then
Answer» 1009 kcal is RELEASED 218 kcal is ABSORBED 109 kcal is absorbed 218 kcal is released. Solution :Bond energy of O-H bond =109 kcal/mol `THEREFORE`Energy absorbed in the dissociation of 1 mole of water `(H_(2)O)=2xx109=218`kcal `therefore` Energy released in the formation of 1 mole of water =218 kcal

Discussion

27.	The bond energy of fluorine is more than that of chlorine.
Answer» Solution :The BOND ENERGY of FLUORINE is less than that of CHLORINE.

Discussion

28.	The bond energy (in kcal mol^(-1)) ofa C - C single bond is approximately
Answer» 1 10 100 1000 Solution :`E_(C-C)E_(C-C)~=100 K CAL//"MOLE"`

Discussion

29.	The bond energy (in Kcal mol^(-)) of a C-C single bond is approximately:
Answer» `1` `10` `100` `1000` SOLUTION :`E_(C-C)~= 100` Kcal/mole.

Discussion

30.	The bond energy is the energy required to
Answer» dissociate oneemole of the substance dissociate BOND in 1 kg of the substance break onemole of SIMILAR bonds break bonds in one mole of substance Solution :The energy is the energy required to break one moel of similar bonds.

Discussion

31.	The bond energy for catenation next to carbon is:
Answer» N S Si P Answer :C

Discussion

32.	The bond energies of C-C,C=C, H-H and C-H bonds are 350 kJ mol^-1, 600 kJmol^-1, 400 kJmol^-1 and 410 kJmol^-1 respectively. The enthalpy of hydrogenation of ethane is _______________.
Answer» `-170`KJ `-260`kJ `-400`kJ `-450`kJ Answer :A

Discussion

33.	The bond energies of of C - C, C = C, H - H and C - H linkages are 350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is
Answer» `- 170 kJ mol^(-1)` `- 260 kJ mol^(-1)` `- 400 kJ mol^(-1)` `- 450 kJ mol^(-1)` Solution :`CH_(2) = CH_(2) + H_(2) rarr CH_(3)CH_(3)` or `UNDERSET(underset(H)(\|))overset(overset(H)(\|))(C) = underset(underset(H)(\|))overset(overset(H)(\|))(C) + H - H rarr H - underset(underset(H)(\|))overset(overset(H)(\|))(C) - underset(underset(H)(\|))overset(overset(H)(\|))(C) - H` `Delta_(r) H = Sum B. E ("REACTANTS) - Sum B. E ("Products")` `= B. E. 4(C - H) + B. E. (C = C) + B. E. (H - H) - B. E. 6 (C - H) - B. E. (C - C)` `= E. (C = C) + B. E. (H - H) - 2B. E.(C - H) - B. E. (C - C)` `= 600 + 400 - 2 xx 410 - 350` `= - 170 kJ`

Discussion

34.	The bond energies of H - H and I - I bonds are 435 kJ mol^-1 and 150 kJ mol^-1 respectively. If DeltaH_f^o for HI is 26.5 kJ mol^-1 then bond enthalpy of H-I bond is
Answer» 558.5kJ/mol 266kJ/mol 611.5kJ/mol 293kJ/mol Answer :D

Discussion

35.	The bond energies of C-C, C=C, H-H and C-H linkages arev350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is:
Answer» `-170 KJ mol^-1` `-260 kJ mol^-1` `-400 kJ mol^-1` `-450 kJ mol^-1` Answer :A

Discussion

36.	The bond distance between H-atom in H_(2) and X-atoms in X_(2) is 74 pm and 124 pm respectively. Find distance between H and X in HX electronegativity (EN) of H is 2.1 and X is 3.1 in pauling scale. Use Stevenson-Schomaker formula. [Divide your answer by 10]
Answer» Solution :`d_(H-X)=r_(H)+r_(X)-0.09\|r_(X)+r_(H)\|` where `r_(H) & r_(X)` PUT in `overset(@)A` unit. `d_(H-X)=37xx10^(-2)+62xx10^(-2)-0.09xx1=0.99` `0.09=0.90 overset(@)A=90pm` `=(90)/(10)=9`

Discussion

37.	The bond energies ("in KJ mole"^(-1)) of P-H, As-H and N-H respectively ?
Answer» 247, 318 and 389 247, 389and 318 318, 389 and 247 318, 247 and 389 ANSWER :4

Discussion

38.	The bond dissociation energy "off"_(2) is very low due to
Answer» LOW density repulsions between NON BONDING electrons its low atomic number atractions between non bonding electrons Answer :B

Discussion

39.	The bond dissociation energy of gaseous H_(2),Cl_(2) and HCl are 104, 58 and 103 "kcal/mole" respectively. Calculate the enthalpy of formation of HCl gas.
Answer» SOLUTION :For the reaction `H_(2)(g)+Cl_(2)(g) to 2HCl(g)` For reactants Bond energy OF1 mole of H-H bond `=104` kcal Bond energy of 1 mole of Cl-Cl bond `=58` kcal For products : Energy of formation of 2 MOLES of H-Cl bond `=-2xx103` kcal Thus `DeltaH` of the above reaction `=104+58-206=-44` kcal SINCE, for `H_(2)+Cl_(2) to 2HCl` , `DeltaH=-44kcal` then for, `(1)/(2)H_(2)+(1)/(2)Cl_(2) to HCl` , `DeltaH=-22kcal`

Discussion

40.	The bond dissociation energy of C-H in CH_4 from the equation C(g) + 4H(g) to CH_4(g), DeltaH = -397.8 kcal is :
Answer» `+ 99.45 KCAL` `-99.45 kcal` `+397 .8 kcal` `+ 198.9 kcal` ANSWER :A

Discussion

41.	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 ascompared to that of C-F is:-
Answer» 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`. Lower DEGREE of `ppi-ppi` interaction between B and F in `BF_3` than that between C and F in `CF_4` Smaller size of B atom as compared to that of C atom STRONGER BOND between B and F in `BF_3`as compared to that between C and F in CF SOLUTION :In `BF_3 .ppi-ppi` back bonding is present .

Discussion

42.	The bond dissociation energy needed to form benzyl radical from toluene is …. Than the formation of the methyl radical from methane
Answer» Less Much Equal None of the above Answer :B

Discussion

43.	The bond dissociation energy depends upon the nature of the bond and nature of the molecule. If any molecule more than 1 bonds of similar nature are present then the bond energy reported is the average bond energy. Heat evolved when 0.75 mol of molten aluminium at its melting point of 658^(@)C is solidified and cooled to 25^(@)C. The enthalpy of fusion of aluminium is 76.8 "cal" g^(-1) and C_(P)= 5.8 "cal" mol^(-1) ""^(0)C
Answer» `-4.3` KCAL 4.3 kcal `-1.199k` cal 1.199kcal Answer :A

Discussion

44.	The bond dissociation energies of X_(2), Y_(2) and XY are in the ratio of 1 : 0.5 : 1, DeltaH for the formation of XY is - 200 kJ mol^(-1). The bond dissociation energy of X_(2) will be
Answer» 200 KJ `mol^(-1)` 100 kJ `mol^(-1)` 800 kJ `mol^(-1)` 400 kJ `mol^(-1)` Solution :Let B.E.Of`x_(2), y_(2)` & xy are x kJ `mol^(-1)`, `0.5 x kJ mol^(-1)` and x kJ `mol^(-1)`RESPECTIVELY. `(1)/(2)x_(2)+(1)/(2)y_(2)rarrxy, DeltaH=-200 kJ mol^(-1)` `DeltaH=-200=Sigma(B.E)_("REACTANT")-Sigma(B.E)_("PRODUCT")` `=[(1)/(2)XX(x)+(1)/(2)xx(0.5x)]-[1xx(x)]` `"B.E. of "X_(2)=x=800 kJ mol^(-1)`.

Discussion

45.	the bond dissociation energies of gasseous H_(2) , Cl_(2) and HCl are 104 .58and 103 kcal respectively . The enthaply of formation of HCl gas would be
Answer» `-44 kcal` 44 kcal `-22 kcal ` 22 kcal Solution :`1/2H_(2)+1/2Cl_(2)toHCl` `DeltaH=[1/2RE(H_(2))+1/2BE(Cl_(2))]-BE(HCL)` `[(1/2xx104)+(1/2xx58)]-103=-22kcal`

Discussion

46.	The bond dissociatin energy of C-H bond in CH_4 from the equation, C(g)+4H(g)rarrCH_4, triangleH=-397.8kcal is:
Answer» `+397.8 KCAL` `+198.9 kcal` `+99.45 kcal` `-99.45 kcal` ANSWER :D

Discussion

47.	The bond Br-Cl is:
Answer» POLAR Non-polar True covalent Co-ordinate Answer :A

Discussion

48.	The bond cleavages during esterification reaction between (A) =CH_3 COOH and (B) C_2 H_5OH
Answer» `C-O " in "" B and O- H " "in " A ` ` C- O" in " "" A and O- H " in " B` ` C - O " in " "" A and O - H "in "A ` ` O - H " in """ B and O -H " in " A ` ANSWER :B

Discussion

49.	The bond between the adsorbate and adsorbent in chemisorption is
Answer» Ionic BOND COVALENT bond EITHER ionic or covalent bond VANDERWALL forces

Discussion

50.	the bond between P atom and Cl atom are in PCl_5 are likely to be
Answer» IONIC with no COVALENT character Covalent with no ionic character Covalent with some ionic character Ionic with some METALLIC character Answer :C

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The bond order of Cl-O in ClO_(4)^(-) is (x)/( y ) then x-y=?

The bond order of C_2^+ is :

The bond strength is maximum in :

The bond order in peroxide ion is :

The bond order in O_(2)^(+) is

The bond order in NO is 2.5 while that in NO^(+) is 3. Which of the following statements is true for these two species ?

The bond order in O_(2)^(+) is same as in

The bond order in O_2^+ IS equal to bond order in:

The bond order in N_(2)^(+), O_(2) and F_(2) follows the order :

The bond order in NO^(+) is :

The bond order between C and C in acetylene molecule is

The bond lengths in the species O_(2), O_(2)^(+) and O_(2)^(-) are in the order

The bond lengths in O_(2), O_(2)^(+) and O_(2)^(-) species follow the order :

The bond length of the S-O bond is maximum in which of the following compounds?

The bond length is CO is 1.128Å what will be the bond length of CO in Fe(CO)_(5)?

The bond length in LiF will be

The bond length in CO is 1.128 Å. What will be the bond length of CO in Fe(CO)_(5) ?

The bond length between sp^3 hybridised carbon atom and other carbon atom is minimum in

The bond length in CO is 1.128 Å. What will be the bond length of CO in Fe(CO)_(5)?

The bond length between sphybrid carbon and other carbon is minimum in:

The bond formed by sidewise overlapping of atomic orbitals is:

The bond in protein structure, that are not broken in denaturation is

The bond having the highest bond energy is :

The bond in a molecule of HCl is formed due to the overlapping of:

The bond enerhies of F_2, Cl_2, Br_2 and I_2 are 155.4, 243.6, 193.2 and 151.2 kJ mol^-1 respectively.The strongest bond is:

The bond energy of ann O-H bond is 109 kcal/mol. When 1 mole of water is formed, then

The bond energy of fluorine is more than that of chlorine.

The bond energy (in kcal mol^(-1)) ofa C - C single bond is approximately

The bond energy (in Kcal mol^(-)) of a C-C single bond is approximately:

The bond energy is the energy required to

The bond energy for catenation next to carbon is:

The bond energies of C-C,C=C, H-H and C-H bonds are 350 kJ mol^-1, 600 kJmol^-1, 400 kJmol^-1 and 410 kJmol^-1 respectively. The enthalpy of hydrogenation of ethane is _______________.

The bond energies of of C - C, C = C, H - H and C - H linkages are 350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is

The bond energies of H - H and I - I bonds are 435 kJ mol^-1 and 150 kJ mol^-1 respectively. If DeltaH_f^o for HI is 26.5 kJ mol^-1 then bond enthalpy of H-I bond is

The bond energies of C-C, C=C, H-H and C-H linkages arev350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is:

The bond distance between H-atom in H_(2) and X-atoms in X_(2) is 74 pm and 124 pm respectively. Find distance between H and X in HX electronegativity (EN) of H is 2.1 and X is 3.1 in pauling scale. Use Stevenson-Schomaker formula. [Divide your answer by 10]

The bond energies ("in KJ mole"^(-1)) of P-H, As-H and N-H respectively ?

The bond dissociation energy "off"_(2) is very low due to

The bond dissociation energy of gaseous H_(2),Cl_(2) and HCl are 104, 58 and 103 "kcal/mole" respectively. Calculate the enthalpy of formation of HCl gas.

The bond dissociation energy of C-H in CH_4 from the equation C(g) + 4H(g) to CH_4(g), DeltaH = -397.8 kcal is :

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 ascompared to that of C-F is:-

The bond dissociation energy needed to form benzyl radical from toluene is …. Than the formation of the methyl radical from methane

The bond dissociation energies of X_(2), Y_(2) and XY are in the ratio of 1 : 0.5 : 1, DeltaH for the formation of XY is - 200 kJ mol^(-1). The bond dissociation energy of X_(2) will be

the bond dissociation energies of gasseous H_(2) , Cl_(2) and HCl are 104 .58and 103 kcal respectively . The enthaply of formation of HCl gas would be

The bond dissociatin energy of C-H bond in CH_4 from the equation, C(g)+4H(g)rarrCH_4, triangleH=-397.8kcal is:

The bond Br-Cl is:

The bond cleavages during esterification reaction between (A) =CH_3 COOH and (B) C_2 H_5OH

The bond between the adsorbate and adsorbent in chemisorption is

the bond between P atom and Cl atom are in PCl_5 are likely to be

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 ascompared to that of C-F is:-