The order of electronegativity of carbon in sp, sp2 and sp3 hybridized states follows

1. sp>sp2>sp3

2. sp3>sp2>sp

3. sp>sp3>sp2

4. sp2>sp>sp3

 

Subtopic:  Hybridisation |
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In which of the dimerization process, the achievement of the octet is not the driving force.

1.  2AlCl3 Al2Cl6

2.  BeCl2BeCl2 solid

3.  2lCl3 l2Cl6

4.  2BH3 B2H6

Subtopic:  Types of Chemical Bond |
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Anhydrous AlCl3 is covalent. If the lattice energy forAlCl3 = 5137 kJ mol-1, hydration for Al3+ = -4665 kJ mol-1 and Hydration for Cl- = -381 kJ mol-1, will it remain covalent or become ionic in aqueous solution?

1.  It will remain covalent

2.  It will remain ionic

3.  It may or may not become ionic

4.  Being ionic or covalent of any molecule is independent of ionisation energy

Subtopic:  Types of Chemical Bond |
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The melting point of AlF3 is 104°C and that of SiF4 is -77°C (it sublimes) because:

1.  There is a very large difference in the ionic character of the Al - F and Si - F bonds

2.  In AlF3, Al3+ interacts very strongly with the neighboring F- ions to give a three-dimensional structure but in SiF4 no such interaction is possible

3.  The silicon ion in the tetrahedral SiF4 is not shielded effectively from the fluoride ions whereas in AlF3, the Al+3 ion is shielded on all sides

4.  The attractive forces between the SiF4 molecules are strong whereas those between the AlF3 molecule are weak

Subtopic:  Types of Chemical Bond |
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In the series ethane, ethylene and acetylene, the C - H bond energy is

1.  The same in all the three compounds

2.  Greatest in ethane

3.  Greatest in ethylene

4.  Greatest in acetylene

Subtopic:  Covalent Bond |
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The bond order depends on the number of electrons in the bonding and antibonding orbitals. Which of the following statements are correct about bond order?

1.  Bond order can have a negative value.

2.  It always has an integral value.

3.  It is a nonzero quantity

4.  It can assume any value-positive or integral or fractional, including zero upto four.

Subtopic:  Types of Chemical Bond |
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What is the best description of the geometry of the nitrogen atoms in dimethylnitrosamine, CH32NNO?

         N bounded to CH3 groups                       N bonded to O

1.  Trigonal planar                                         Linear

2.  Trigonal planar                                         Bent

3.  Trigonal pyramidal                                   Linear

4.  Trigonal pyramidal                                   Bent

Subtopic:  Hybridisation |
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The following diagram is sometimes used to illustrates the structure of benzene C6H6

Which of the statements concerning the structure of benzene is false?

1.  The double bonds oscillate rapidly back and forth between adjacent pairs of carbon atoms

2.  The H -C -C angles are 120°

3.  The carbon atoms form a flat hexagonal ring

4.  Above structures are resonance structures

Subtopic:  Types of Chemical Bond |
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The diamagnetic species is

1. NO

2. NO2

3. O2

4. CO2

Subtopic:  M.O.T |
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Consider the Lewis structure given below for the CH3CCH molecule

                          

What is the maximum number of atoms that can lie in the same plane?

1.  Three

2.  Four

3.  Five

4.  Six

 

Subtopic:  Hybridisation |
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