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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 ?

Boric acid considered as a weak acid because it is not able to release H⁺ ions on its own. It receives OH^– ions from water molecule to complete its octet and in turn, releases H⁺ ions.

In other words, boric acid is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion.

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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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