Long Answer Type
Short Answer TypeRationalise the given statements and give chemical reactions:
(a)Â Lead (II) chloride reacts with Cl2Â to give PbCl4.
(b)Â Lead (IV) chloride is highly unstable towards heat.
(c)Â Lead is known not to form an iodide PbI4.
Classify following oxides as neutral, acidic, basic or amphoteric:
CO, B2O3, SiO2, CO2, A12O3, PbO2, Tl2O3.Â
Long Answer TypeWhat are silicones? How are these prepared? Give their uses.
Or
What are silicones? Give methods for the preparation of different types of silicones.Â
Short Answer TypeIf the starting material for the manufacture of silicones is RSiCl3, write the structure of the product formed.Â
What are the applications of silicones in technology?
Or
Mention some uses of silicones.
Applications of silicones in technology:
1.Silicones are water repellents and good insulators, they are used for water proofing and in electrical condensers.
2. Silicone polymers are used for high-temperature oil baths, high vacuum pumps etc.
3. They are used as excellent insulators for electric motors and other electrical appliances.
4. They find applications in making vaseline like greases which are used as lubricants in aeroplanes.
5. Silicon ribbons are very useful because they retain their elasticity at a lower temperature. They are also mixed in paints to make them damp resistant.
Explain the following reactions:
Silicon is heated with methyl chloride at high temperature in the presence of copper.
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