The p-Block Ele...

Assertion (A) : Silica is less harder than diamond .
Reason (R) : Silica has only two dimensional network .

Which of the following statements are true about quartz?
A. it is pure crystalline form of silica.
B. it is a tetrahedral polymer of $$SiO_{2}$$.
C. UV light can pass through quartz.

 Decreasing order of p-orbital character in the following is:
A) $$ SiO_{2}$$        B) $$ CO_{2}$$        C) Graphite

$$SiF_{4} + H_{2} O \rightarrow A \xrightarrow {1000^oC} B \xrightarrow {Na_{2}CO_{3}} C$$

Arrange the group 14 elements in the order of decreasing ionisation energies.

A. Graphite acts as lubricant due to layer like structure.
B. The distance between two layers in graphite is $$1.42^{\circ}A$$.
C. Silica does not react with HCl, HBr and Hl.
Which of the above statement(s) is/are true?

A. Silanes are good reducing agents.
B. $$SiO _{2}$$ is a giant tetrahedral polymer.
C. $$SnCl_{4}$$ acts as bronsted base.
The correct option is :

STATEMENT-1 : $$SiO_{2}$$ is used as an acidic flux in metallurgy.
STATEMENT-2 : $$SiO_{2}$$ removes basic impurities forming a slag.

Match list I and list II.
List -I                                    List -2
A)$$ SiCl_{4}$$                              1)  $$ SiO_{2}$$                     
B) Tetrahedral                     2)  Acid-flux             
C) Acheson's process         3) Lewis Acid
D) $$ SiO_{2}$$                               4) Silicon 
                                              5)Graphite

The compounds of boron are :