Q.

The percentage of silica in sodium silicate is approximately (Si = 28)

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answer is 3.

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Detailed Solution

Sodium Silicate Na2SiO3Silica is SiO2Molecular weight  of Na2SiO3 = 2(23) + 28 + 3(16)= 46 + 28 + 48Molecular weight  of SiO2 = 28 + 2(16)= 60% of Silica in sodium silicate = ≈ 50%
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