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The p-Block Elements

Short Answer Type

171.

Explain the following reactions:
CO is heated with ZnO

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Long Answer Type

172.

What are silicates? Discuss briefly their structures.

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Short Answer Type

173.

For a compound LiAl(SiO₃)₂, what is the charge on SiO₃ unit? What is the arrangement of oxygen atoms around the silicon atom?

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Long Answer Type

174.

What are zeolites? What are the applications of zeolites?

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Short Answer Type

175.

Why does boron trifluoride behave as a Lewis acid ?

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176.

Consider the compounds, $BCl subscript 3 space and space CCl subscript 4$ . How will they behave with water? Justify

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177.

Is boric acid a protic acid? Explain.

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Long Answer Type

178. What are electron deficient compunds? Are BCl₃and SiCl₄ electron deficient species? Explain.

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179.

Explain the difference in properties of diamond and graphite on the basis of their structures.

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Short Answer Type

180.
Explain why is there a phenomenal decrease is ionisation enthalpy from carbon to silicon.

Ionisation enthalpy of carbon is very high. this is expected owing to its small size. However, on moving down the group to silicon, there is a sharp decrease in the enthalpy. 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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