Question

a) Silicone is a polymeric organosilicon compound which is chemically inert and thermally stable
b) Silicon carbide can be used as a lubricant.
c) Silicon dioxide is the raw material for the manufacture of cement as well as glass.
d) Hardness of $Si{O_2}$ and $SiC$ is due to their regular tetrahedral structure.
Which of the following regarding silicon and its compounds is correct?
A) a and b
B) b and c
C) a, c and d
D) only d

Answer 1

Hint:Silicon is an element of group fourteen placed just below carbon showing similar properties as that of carbon like catenation, allotropy and tetravalency.
It has a great application as an element used for developing semiconductor and its compounds with various non-metals act as raw materials in the production department of various industries.

Complete step by step answer:
A silicone or polysiloxane are polymers made up of siloxane ( $ - {R_2}Si - O - Si{R_2} - $ where $R$ = organic group). They are mostly colorless, oils or rubber-like substances. They are generally used in adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Some of their common forms include silicone oil, silicone grease, silicone rubber, silicone resin, and silicone caulk.
They vary in consistency in various forms like liquid to gel or rubber to hard plastic. The most common siloxane is linear polydimethylsiloxane.
The most important thing is that they are made up of inert synthetic compounds consisting of repeating units of siloxane, which is a functional group of two silicon atoms and one oxygen atom frequently combined with carbon and/ or hydrogen.

While silicon carbide is commonly used in hard rings because of its abrasion resistance, corrosion resistance, and thermal shock resistance but is not use as a lubricant
At the same time Silicon dioxide is used as raw material for the manufacture of cement as well as glass because of its strong fitness, compressive strength, bond strength, and abrasion resistance.
Finally we know that in $Si{O_2}$ and $SiC$ $Si$ have $s{p^3}$ hybridization with zero lone pair hence they have a tetrahedral shape that is the reason of their hardness just like diamond in which carbon also has $s{p^3}$hybridization making it the hardest substance present on earth

Hence option ‘C’ is the correct solution for the above question.


Note:
Silicone oven mitts are able to withstand temperatures up to $533K$, making it possible to reach into boiling water also it is used as an insulator in heat resisting potholders
Silicon is neither a metal nor a non-metal it has properties in between those and falls under the category of metalloids.