The boiling points of CH3COCH3, CH3COC2H5 and CH3COC3H7 are 56°C, 80°C, and 102°C, respectively. This increase is best attributed to an increase in which of the following?

l.  Dipole-dipole interactions.

ll.  Dispersion forces.

lll.  Hydrogen bonding.

1.  l only

2.  l  and ll.

3.  lll only

4.  ll and lll only

Subtopic:  Polarity |
 52%
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The lattice energy (energy required to separate the ions in an ionic solid) of MgO is much larger than that of LiF.

What contributes the most to this difference?

1.  Mg2+is a smaller ion than Li+and O2- is a smaller ion than F-

2.  F is more electronegative than O, and Li is more electropositive than Mg

3.  MgO contains doubly charged ions, while LiF contains singly charged ions

4.  MgO contains more electrons than LiF

Subtopic:  Polarity |
 62%
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Allene has the structure H2C =C=CH2 . What is the best description of the geometry of allene?

  Geometry at central carbon                    Position of hydrogen atoms

1.  Linear                                                  All in the same plane

2.  Linear                                                  In two perpendicular planes

3.  Bent                                                    All in the same plane

4.  Bent                                                    In two perpendicular planes

Subtopic:  Hybridisation |
 53%
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Which property or properties of metals can be accounted for by the electron sea model?

l.  Electrical conductivity

ll. Malleability

1.  l only

2.  ll only

3.  Both l and ll

4.  Neither l nor ll

Subtopic:  Types of Chemical Bond |
 63%
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What is the principal energetic factor in the lack of miscibility between C6H14l and H2Ol?

1.  The strength of intermolecular forces of attraction between C6H14l molecules

2.  The strength of intermolecular forces of attraction between H2Ol molecules

3.  The differences between the molecular weights of the molecules

4.  The difference in electronegativity between carbon and hydrogen

 

Subtopic:  van der Waal Force & Hydrogen Bonding |
 68%
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The value of 'x' in NH42 FeSO4x.6H2O is

1.  1

2.  2

3. 3

4.  4

Subtopic:  Introduction to Redox and Oxidation Number |
 67%
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The correct structure of ClF3is

1.  

2.  

3.  

4.  

Subtopic:  Hybridisation |
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Select the correct statement regarding XeO2F2 among the folowing.

a.  Xe is sp3d hybridised.

b.  4 bond pairs and 1 lone pair are present around Xe.

c.  Shape of XeO2F2 is square pyramidal.

d.  Contains -pπ bonds.

1.  a and b

2.  a,  and d

3.  a, b and d

4.  b, c and d

Subtopic:  Hybridisation |
 57%
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Consider the given box

The total number of compounds having expanded octet around the central atom is

1.  2

2.  4

3.  2

4.  3

Subtopic:  Octate, Isoelectronic Species, Lewis Structure & Formal Charge |
 73%
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Which of the following atomic orbitals will show zero overlaps? (consider x-axis as the molecular axis)

1.  Px, Px

2.  Py, Py

3.  Py, Pz

4.  Px, s

Subtopic:  Covalent Bond |
 73%
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