1. Write chemical equations when: 1. Borax is heated strongly. 2. Aluminium is treated with dilute NaOH. 3. Dimethyldichlorosilane is hydrolysed followed by condensation polymeri-sation. 2. 1. Explain that CO_2 is a gas while SiO_2 is solid at room temperature. 2. SnCl_2 acts as reducing agent. Explain.

1. 1. Na_2B_4O_7.10H_2O heat Na_2B_4O_7 ^Borax heat 2NaBO_2+B_2O_3 ^Sodium ^Boric ^metaborate ^anhydride 2. 2Al+2NaOH+2H_2O 2NaAlO_2+3H_2 ^Sodium ^metaaluminate 3. 2. 1. CO_2 exists as descrete molecules whereas SiO_2 is three dimensional covalent solid. 2. Sn^ 4+ is more stable than Sn^ 2+ , therefore SnCl_2 is good reducing agent.

1. Write chemical equations when: 1. Borax is heated strongly. 2.…

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Question

Write chemical equations when:

Borax is heated strongly.
Aluminium is treated with dilute NaOH.
Dimethyldichlorosilane is hydrolysed followed by condensation polymeri-sation.

Explain that $CO_2$ is a gas while $SiO_2$ is solid at room temperature.
$SnCl_2$ acts as reducing agent. Explain.

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Answer

$\text{Na}_2\text{B}_4\text{O}_7.10\text{H}_2\text{O}\xrightarrow{\ \ \ \text{heat}\ \ \ }\text{Na}_2\text{B}_4\text{O}_7\\ \ \ \ \ \ \ \ ^\text{Borax}\\ \xrightarrow{\ \ \text{heat}\ \ }2\text{NaBO}_2+\text{B}_2\text{O}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Sodium}\ \ \ \ \ \ \ \ ^\text{Boric}\\ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{metaborate}\ \ \ ^\text{anhydride}$
$2\text{Al}+2\text{NaOH}+2\text{H}_2\text{O}\xrightarrow{\ \ \ \ }2\text{NaAlO}_2+3\text{H}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Sodium}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{metaaluminate}$

$CO_2$ exists as descrete molecules whereas $SiO_2$ is three dimensional covalent solid.
$Sn^{4+}$ is more stable than $Sn^{2+}$, therefore $SnCl_2$ is good reducing agent.