Chemistry Class-11: Chapter – 4. Chemical Bonding and Molecular Structure Part – 8 (For CBSE, ICSE, IAS, NET, NRA 2023)
Get unlimited access to the best preparation resource for CBSE/Class-8 : get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-8.
V. Assertion and Reason Type
In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Question: 57
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.
(i) A and R both are correct, and R is the correct explanation of A.
(ii) A and R both are correct, but R is not the correct explanation of A.
(iii) A is true but R is false.
(iv) A and R both are false.
Answer: (i)
Question: 58
Assertion (A) : Though the central atom of both molecules are hybridised, bond angle is greater than that of .
Reason (R) : This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.
(i) A and R both are correct, and R is the correct explanation of A.
(ii) A and R both are correct, but R is not the correct explanation of A.
(iii) A is true but R is false.
(iv) A and R both are false.
Answer: (i)
Question: 59
Assertion (A) : Among the two bonds in molecule, the energy required to break the first bond and the other bond is the same.
Reason (R) : This is because the electronic environment around oxygen is the same even after breakage of one bond.
(i) A and R both are correct, and R is correct explanation of A.
(ii) A and R both are correct, but R is not the correct explanation of A.
(iii) A is true but R is false.
(iv) A and R both are false.
Answer: (iv)
VI. Long Answer Type
Question: 60
(i) Discuss the significance/applications of dipole moment.
(ii) Represent diagrammatically the bond moments and the resultant dipole moment in and .
Answer:
Question: 61
Use the molecular orbital energy level diagram to show that would be expected to have a triple bond, , a single bond and , no bond.
Answer:
Question: 62
Briefly describe the valence bond theory of covalent bond formation by taking an example of hydrogen. How can you interpret energy changes taking place in the formation of dehydrogenate?
Answer:
Question: 63
Describe hybridisation in the case of and . The axial bonds are longer as compared to equatorial bonds in whereas in both axial bonds and equatorial bonds have the same bond length. Explain.
Answer:
Question: 64
(i) Discuss the concept of hybridisation. What are its different types in a carbon atom?
(ii) What is the type of hybridisation of carbon atoms marked with star.
(a)
(b)
(c)
(d)
(e)
Answer: