chemistry-class-12-unit-07-chapter-04-some-p-block-elements-l-8-8-4ly-vcovw54

### <Success>Silicon, germanium, tin and lead</Success>
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<ul>
<li>Silicon is the most abundant element (after oxygen) in the earth’s crust</li>
<li>Occurs as silica (SiO₂) and silicate minerals</li>
<li>Germanium is least common and occurs in some zinc and silver ores and also in flue dust and the ashes of certain types of coal</li>
<li>Si and Ge adopt diamond - like structures
$(CF_x)_n$  n = 1 colorless</li>
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<p>$8C+K(g) \rarr KC_8(S)$</p>
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### <Success>Reaction of carbon compound</Success>

$SiCl_4 + LiAlH_4\rarr SiH_4 + LiAlCl_4$

$GeO_2 + LiAlH_4\rarr GeH_4 + LiAlO_2$

$4Ph SiCl_3 + 3LiAlH_4\rarr 4PhSiH_3 + 3LiAlCl_4$

$Me_2SiCl_2 + LiAlH_4\rarr Me_2SiH_2$

$C_8H_{18} + 12.5O_2\rarr 8CO_2 + 9H_2O + Energy -5460KJ$

$C=C \hspace{3mm} C=O \hspace{3mm} C=P$

$C \equiv C \hspace{3mm} C=N \hspace{3mm} C \equiv N$

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![image](https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/chemistry-class-12-unit-07-chapter-04-some-p-block-elements-l-8_8-4ly-vcovw54-24.jpg)
![image](https://temp-public-img-folder.s3.ap-south-1.amazonaws.com/sathee.prutor.images/subject-images/iitpal/image/chemistry-class-12-unit-07-chapter-04-some-p-block-elements-l-8_8-4ly-vcovw54-34.jpg)
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<h3 id="successreaction-of-carbon-compoundsuccess-1"><Success>Reaction of carbon compound</Success></h3>
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<p>$Si+2Cl_2 \rightarrow SiCl_4$</p>
<p>$Sn+2I_2 \rightarrow SnI_2 \rightarrow SnI_4$</p>
<p>$GeO_2+4HBr \rightarrow GeBr_4+2H_2O$</p>
<p>$SiCl_4+H_2O \rightarrow SiO_2.nH_2O+HCl$</p>
<p>$Sn+2HX \rightarrow SnX_2+H_2$</p>
<p>$GeX_4+Ge \rightarrow 2GeX_2$ Comproportionation reaction</p>
<p>$2GeI_2 \rightarrow GeI_4+2Ge$ Disproportionation reaction</p>
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<h3 id="successhydrides-of-carbon-and-siliconsuccess"><Success>Hydrides of carbon and silicon</Success></h3>
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<p>$Ce_9H_{20}, Sn_2H_6$</p>
<p>$Me_3SnCl , Et_4Pb$
PTFE - Polytetrafluoroethylene</p>







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