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The p-Block Elements

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171.

Explain the following reactions:
CO is heated with ZnO

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172.

What are silicates? Discuss briefly their structures.

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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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174.

What are zeolites? What are the applications of zeolites?

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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.

Boric acid is not a protonic acid but acts as a lewis acid by accepting electrons from a hydroxyl ion.

B(OH)₃ +2HOH --> [B(OH)₄]^- +H₃O⁺

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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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180.

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

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177. Is boric acid a protic acid? Explain.

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177.
Is boric acid a protic acid? Explain.