NCERT Class XI Chemistry The p-Block Elements Solutions
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Question : 21
Total: 38
Explain the following reactions :
(a) Silicon is heated with methyl chloride at high temperature in the presence of copper;
(b) Silicon dioxide is treated with hydrogen fluoride;
(c) CO is heated with ZnO;
(d) Hydrated alumina is treated with aqueous NaOH solution.
(a) Silicon is heated with methyl chloride at high temperature in the presence of copper;
(b) Silicon dioxide is treated with hydrogen fluoride;
(c) CO is heated with ZnO;
(d) Hydrated alumina is treated with aqueous NaOH solution.
Solution:
(a) When methyl chloride reacts with silicon in the presence of copper as a catalyst at a temperature 573 K various types of methyl substituted chlorosilane of formula M e S i C l 3 , M e 2 S i C l 2 , M e 3 S i C l M e 4 S i
2 C H 3 C l + S i
( C H 3 ) S i C l 3 + ( C H 3 ) 2 S i C l 2 ( C H 3 ) 3 S i C l + ( C H 3 ) 4 S i
(b) When silicon dioxide is treated with HF, silicon tetrafluoride is formed.
S i O 2 + 4 H F S i F 4 + 2 H 2 O
(c) CO is a powerful reducing agent, it reduces ZnO to Zn.
C O ( g ) + Z n O ( s )
Z n ( s ) + C O 2 ( g )
(d) Aluminium reacts with aqueous alkali and liberates hydrogen gas.
2 A l ( s ) + 2 N a O H ( a q ) + 6 H 2 O ( l ) 2 N a + [ A l ( O H ) 4 ] ( a q ) − + 3 H 2 ( g )
(b) When silicon dioxide is treated with HF, silicon tetrafluoride is formed.
(c) CO is a powerful reducing agent, it reduces ZnO to Zn.
(d) Aluminium reacts with aqueous alkali and liberates hydrogen gas.
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