Long Answer TypeExplain CO2 is a gas while SiO2 is solid.
CO2 is gas. It exists as discrete, monomeric linear gaseous molecule and remains as a gas at room temperature due to the following reasons.
(i) Due to small atomic size, carbon atom possesses partial triple bond character with neighbouring oxygen atoms.
(ii) Due to a linear structure, carbon dioxide molecule is non-polar and thus CO2molecules exhibit weak Vander Waal’s forces.
Silica is solid. In its molecule, each silicon is covalently bonded to four oxygen atoms, which are disposed of tetrahedrally around it and each oxygen atom is linked to two silicon atoms. Thus, silica exists as a network solid (giant molecule) having a three-dimensional structure.
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.
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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