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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?

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113.

Why is boric acid considered as a weak acid ?

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114.

Explain the structure of boric acid.

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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.

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Short Answer Type

117.

Why does carbon act as abrasive and also as lubricant?

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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.

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Short Answer Type

119.
Explain why is there a phenomenal decrease in ionisation enthalpy from carbon to silicion.

This is a due increase in atomic size and screening effect because of which the force of attraction of the nucleus for the valence electron decreases considerably in Si as compared to C. As a result, there is a phenomenal decrease in ionisation enthalpy from carbon to silicon.

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