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Silica is a non-volatile acidic oxide an...

Silica is a non-volatile acidic oxide and forms complex nixture of silicates only when fused with

A

alkalis

B

alkali carbonates

C

both of these

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
`SiO_(2) + NaOH rarr (NaSiO_(3))_(n) + Na_(4)SiO_(4)`
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Silicates are metal derivatives of silicic acid. Silicates are formed by heating metal oxide or metal carbonate with sand. Na_(2)CO_(3) underset(SiO_(3)) overset("Fused with Sand")toNa_(4)SiO_(4),Na_(2)(SiO_(3)) etc A silicate in general has Si-O bond and possesses a complex network solid having silicate ion SiO_(4)^(4-) as the basic structural unit. These silicates occurs singly or by sharing oxygen atom is small occurs singly or by sharing oxygen atom is small groups, in cyclic groups, in infinite chains or infinite sheets giving different structures to silicates such as chain silicates, ring silicates, cyclic silicates, sheet silicates, three dimensional silicates etc., Number of oxygen atoms in pyrosilicate is