AIIMS (All India Institute of Medical Sciences) Chemistry: Questions 65 - 69 of 123

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Question number: 65

» States of Matter » Solid State » Molecular

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Question

Which solid will have the weakest intermolecular forces?

Choices

Choice (4)Response

a.

Ice

b.

Naphthalene

c.

Sodium fluoride

d.

Phosphorus

Question number: 66

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

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Question

What is the weight of molecules of ammonia?

Choices

Choice (4)Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

Question number: 67

» States of Matter » Solid State » Covalent and Metallic Solids

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The structure of is similar to What would M the radius ratio in ?

Choices

Choice (4)Response

a.

0.732 - 1.000

b.

0.155 - 0.225

c.

0.414 - 0.732

d.

0.225 - 0.414

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 number: 68 (1 of 3 Based on Passage) Show Passage

» Chemical Bonding » Molecular Orbital Theory » Bond Order

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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 number: 69 (2 of 3 Based on Passage) Show Passage

» Chemical Bonding » Molecular Orbital Theory » Bond Order

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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

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