Long Answer Type
Short Answer TypeRationalise the given statements and give chemical reactions:
(a) Lead (II) chloride reacts with Cl2 to give PbCl4.
(b) Lead (IV) chloride is highly unstable towards heat.
(c) Lead is known not to form an iodide PbI4.
(i) This is because lead is more stable in +2 oxidation state than in +4 oxidation state due to inert pair effect. Therefore lead (II) chloride is more stable than lead (IV) chloride and hence lead (II) chloride does not react with chlorine to form lead (IV) chloride.
(ii) Since lead in +2 oxidation state is more stable than +4 oxidation state, due to inert pair effect, therefore lead (IV) chloride on heating changes to lead (II) chloride and Cl2.
(iii) Due to the oxidation power of Pb4+ ion and reducing the power of I– ion, PbI4 does not exist.
Classify following oxides as neutral, acidic, basic or amphoteric:
CO, B2O3, SiO2, CO2, A12O3, PbO2, Tl2O3.
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.
Short Answer TypeIf the starting material for the manufacture of silicones is RSiCl3, write the structure of the product formed.
What are the applications of silicones in technology?
Or
Mention some uses of silicones.
Explain the following reactions:
Silicon is heated with methyl chloride at high temperature in the presence of copper.
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