Silica

In silicon dioxide:

1. Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms.

2. Silicon is bonded to two silicon atoms.

3. Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms.

4. There are double bonds between silicon and oxygen atoms.

Pick out the odd one out from the following

1. Tridymite

2. Bauxite

3. Quartz

4. Cristobalite

1. Quartz
2. Cristobalite
3. Tridymite
4. Silica gel

An inorganic compound (A) made of two most occuring elements into the earth crust, having a polymeric tetra-headral network structure. With carbon, compound (A) produces a poisonous gas (B) which is the most stable diatomic molecule. Compounds (A) and (B) will be

1. 

2. 

3. 

4. SiC, CO

1. Castner's process
2. Down's process
3. Solvay's process

4. None of these

1. Quartz
2. Kieselguhr
3. Cristobalite
4. Tridymite

1. $N{a}_{2}C{O}_3$
2. $C{O}_2$
3. $HF$
4. $HCl$

$C(OH{)}_4$ is unstable because a carbon atom cannot hold more than one -OH groups but $Si(OH{)}_4$ is a stable compound because

1. C-O bond energy is low

2. C-O bond energy is high

3. Si-O bond energy is low

4. Si-O bond length is small

Different forms of silica such as quartz, tridymite and cristobalite are as follows:
Quartz $\stackrel{{870}^{\circ }C}{⟶}$ Tridymite $\stackrel{{1470}^{\circ }C}{\rightleftharpoons }$ Cristobalite

$\left(Si{O}_2\right)$ $\left(Si{O}_2\right)$ $\left(Si{O}_2\right)$

The structure possessed in them is:

1. Sheet silicate

2. Three-dimensional silicate

3. Chain silicate

4. Cyclic or ring silicate