Bond Parameters

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. Molecule in which the distance between two adjacent carbon atom is largest, is:

Benzene

Ethyne

Ethene

Ethane

Question 1 of 20

2. The bond length in hypothetical molecules A₂, B₂, C₂ and D₂ are given. Which of the following will have lowest bond enthalpy?

A-A = 74 pm

C-C = 228 pm

D-D = 267 pm

B-B = 144 pm

Question 2 of 20

3. Which of the following statement is correct regarding covalent radius and van der Waals radius?

van der Waals radius is equal to covalent radii

van der Waals radius is always larger than covalent radii

van der Waals radius is always smaller than covalent radii

van der Waals radius is twice covalent radii

Question 3 of 20

4. Amongst the following molecules, the one with the highest bond multiplicity is:

Ethane

Ethene

Benzene

Ethyne

Question 4 of 20

5. Energy required to dissociate 4 g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25°C . The bond energy of H-H bond will be:

104 kcal

10.4 kcal

1.04 kcal

1040 kcal

Question 5 of 20

6. Energy required to break all four C-H bonds in methane is 1662 kJ/mol. Calculate the average bond enthalpy for methane molecule.

332 kJ/mol

436 kJ/mol

208 kJ/mol

416 kJ/mol

Question 6 of 20

7. Among the following halogens the one with highest bond energy is:

Br₂

Cl₂

I₂

F₂

Question 7 of 20

8. Which of the following statements relating bond order and bond enthalpy are correct?

With increase in bond length bond order increases

With decrease in bond length bond order decreases

With increase in bond order bond enthalpy increases

With increase in bond order bond enthalpy decreases

Question 8 of 20

9. Which of the following will have highest value of bond enthalpy?

Cl-Cl bond

H-H bond

F-F bond

Br-Br bond

Question 9 of 20

10. Generally unit of bond enthalpy is expressed in:

cal/mol

MJ

kJ/mol

J/mol

Question 10 of 20

11. Bond energy of covalent O-H bond in water is:

Less than or equal to bond energy of hydrogen bond

Greater than bond energy of hydrogen bond

Less than bond energy of hydrogen bond

Equal to bond energy of hydrogen bond

Question 11 of 20

12. Use bond energies to estimate the enthalpy of formation of HBr(g).
BE(H-H) = 436 kJ/mol
BE(Br-Br) = 192 kJ/mol
BE(H-Br) = 366 kJ/mol

−104 kJ/mol

+262 kJ/mol

−52 kJ/mol

+152 kJ/mol

Question 12 of 20

13. Which bond among the following has the shortest bond length?

C-C

C=C

c≡c

All of these have the same bond length

Question 13 of 20

14. Bond angle is the average angle between orbitals containing ___________ electron pairs around the central atom in a molecule.

Lone pairs

Lone pair and a bond pair

Bonding electron pairs

None of above

Question 14 of 20

15. Which of the following has maximum bond angle?

NH₃

CO₂

H₂O

CH₄

Question 15 of 20

16. Which of the following molecules will have smallest bond enthalpy?

H-Br

H-F bond

H-I

H-Cl

Question 16 of 20

17. In compound X, all bond angles are exactly 109° 28’, X is:

Chloroform

Chloromethane

Carbon tetrachloride

Iodoform

Question 17 of 20

18. The C-H bond distance is longest in:

C₂H₂

C₂H₄Br₂

C₆H₆

C₂H₄

Question 18 of 20

19. Which of the following molecules will have smallest bond length?

H-I

H-F bond

H-Br

H-Cl

Question 19 of 20

20. The bond angle, H-N-H in NH₃ molecule is:

107.5°

109°

120°

90°

Question 20 of 20

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