Question

When silica is heated with Na2CO3 we get ________ which on cooling gives a glassy mass known as _______ because it is _______ in water​

Answer 1

Answer:

Explanation:

Correct option is

B

Water glass

When Sodium carbonate (Na  

2

​

CO  

3

​

) reacts with Silica (SiO  

2

​

), it gives water glass. It is sodium silicate.

Na  

2

​

CO  

3

​

+xSiO2→(Na  

2

​

O)⋅(SiO  

2

​

)  

x

​

+CO  

2

​

 

Soda glass, also known as soda lime glass is obtained by fusing 75% SiO  

2

​

 with 15% Na  

2

​

O and 10% CaO.

To obtain pyrex glass, 60 to 80% SiO  

2

​

 is fused with 10 to 25% B  

2

​

O  

3

​

 and the remaining amount of Al  

2

​

O  

3

​

.

Answer 2

Answer:

12-Aug-2021 — ), it gives water glass. It is sodium silicate. ... O and 10% CaO. To obtain pyrex glass, 60 to 80% SiO. 2. ​. is fused with 10 to ...

Explanation: