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Chemical Bonding-Molecular Orbital Theory [AIIMS (All India Institute of Medical Sciences) Chemistry]: Questions 1 - 4 of 21
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Question 1
Question MCQ▾
The hybridization and geometry of molecule is -
Choices
Choice (4) | Response | |
---|---|---|
a. | and tetragonal | |
b. | d and bent | |
c. | and shaped | |
d. | All of the above |
Passage
DIRECTIONS: Read the passage given below and answer the questions that follows:
The distribution of electrons among various molecular orbitals is called the electronic configuration of the molecule which provides us the following very important information about the molecule.
(I) Stability of molecule: The molecule is stable if number of bonding molecular orbital electrons is greater than the number of anti-bonding molecular orbital electrons .
(II) Bond order: Bond order
A positive bond order means a stable molecule while a negative or zero bond order means an unstable molecule.
(III) Nature of the bond: Bond order corresponds to single, double and triple bonds respectively.
(IV) Bond length: Bond length decreases as bond order increases.
(V) Magnetic nature: If molecular orbitals in a molecule are doubly occupied, the substance is diamagnetic and if one or more molecular orbitals are singly occupied, it is paramagnetic.
Question 2 (1 of 3 Based on Passage)
Question MCQ▾
Which of the following statement is incorrect?
Choices
Choice (4) | Response | |
---|---|---|
a. | In molecule, the energy of is more than and | |
b. | and are diamagnetic | |
c. | Molecule does not exist as the bonding and anti-bonding orbitals cancel each other | |
d. | Among , and the bond length decreases as |
Question 3 (2 of 3 Based on Passage)
Question MCQ▾
The following molecules/species have been arranged in the order of their increasing bond orders. Identify the correct order:
(I)
(II)
(III)
(IV)
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 4 (3 of 3 Based on Passage)
Question MCQ▾
has greater dissociation energy than , whereas has a lower dissociation energy than because -
Choices
Choice (4) | Response | |
---|---|---|
a. | Bond order is increased when is ionized to and bond order is decreased when is ionized to | |
b. | Bond order is decreased when is ionized to and bond order is increased when is ionized to | |
c. | Bond order is decreased when is ionized to and bond order is decreased when is ionized to | |
d. | Question does not provide sufficient data or is vague |