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Chemical Bonding and Molecular Structure

Short Answer Type

121. What is the significance of Lewis symbol? How do these help in finding the valency of an element?

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Long Answer Type

122.

What is an ionic bond? How is it formed? Illustrate with suitable examples.

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123.

Draw the Lewis structures for the following molecules and ions:
$straight H subscript 2 straight S comma space space SiCl subscript 4 comma space space BeF subscript 2 comma space space CO subscript 3 superscript 2 minus end superscript comma space space HCOOH$

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Short Answer Type

124.

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions:
(a) K and S, (b) Ca and O (c) Al and N

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Long Answer Type

125. Discuss the factors which favour the formation of ionic bond.

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Short Answer Type

126.

Define lattice enthalpy. How is it violated to the stability of an ionic compound?

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127.

What are important consequences of lattice enthalpies?

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128.
Write three favourable factors for the formation of ionic bond ?

Three favourable factors for the formation of ionic bond are:

(i) Low ionisation enthalpy of the metal atom.
(ii) High electron gain enthalpy of the non- metal atom.
(iii) High lattice enthalpy of the compound formed.

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