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The p-Block Elements

Short Answer Type

111.

Explain what happens when boric acid is heated.

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112.

Explain what happens when boric acid is added to water?

297 Views

113.

Why is boric acid considered as a weak acid ?

748 Views

114.

Explain the structure of boric acid.

143 Views

115.

Name the elements of group 14 and write down their electronic configuration.

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Long Answer Type

116.

How do elements of group 14 occur in nature? Give their uses.

150 Views

Short Answer Type

117.

Why does carbon act as abrasive and also as lubricant?

236 Views

Long Answer Type

118.

Discuss the characteristics of group 14 elements in terms of:
(i) Atomic radius
(ii) Ionisation enthalpy
(iii) Electropositive character
(iv) Melting and boiling points.

201 Views

Short Answer Type

119.

Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicion.

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120.
Discuss the characteristics of group 14 elements in terms of:

(i) Oxidation states
(ii) Metallic character.

(i) Oxidation states: All the elements of group 14 elements show +4 oxidation state. However as we go down the group, the stability of +4 oxidation state decreases while that of +2 oxidation state increases. This is due to the inert pair effect.

(ii) Metallic character:The elements of group 14 are less metallic than the elements of group 13. This is due to the less electropositive character of group 14 elements. Carbon and silicon are non-metallic, germanium is a metalloid while tin and lead are metallic. Thus the metallic character increases down the group.

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