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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 ?

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Long Answer Type

129. What are important characteristics of ionic compounds?

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Short Answer Type

130.
Can sodium chloride conduct electric current in the solid state?

No, sodium chloride can not conduct electricity in the solid state. This is because oppositely charged ions (Na⁺ and Cl^– ions) are held together by a strong electrostatic force of attraction. These ions occupy fixed positions in the crystals and do not move when an electric field is applied.

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